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| oilcan | code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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Guru Newb
 
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Hi to everyone, just bought my 94 c4 2 months ago!!! I've been lurking and searching the forums pretty much since day 1 so thanks for all the great info!
Problem #1 title says it all used the paper clip method and these codes popped up H84 C34 H34 C33 Quick back ground info.. Ive been searching trying to find out how to deal with these. I just received my 2 part FSM yesterday and have been reading it for 3 hours but my vocabulary must not be good enough or something because i can't seem to figure much out with it.. i couldn't even find where it had the trouble codes listed lol! Im getting frustrated because it just dosnt have the power it should and there is so much stuff to fix on the car as it is.. suspension work mostly... Problem #2 vibration comes on at 70 mph. seems to originate from rear end Just had tires balanced/ rotated no change put in all 6 ujoints 2 new rear wheel bearings can't remember if it did it before the bearings and u joints... thanks in advance..! |
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Posted on: 2012/8/25 17:07
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| captmike13 | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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Elite Guru
 
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Welcome aboard.
Amdy aka bogus just went through this vibration thing with his. He should chime in with some suggestions. |
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Posted on: 2012/8/25 17:14
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Mike| bogus | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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Grand Imperial Pooh-Bah
 
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oilcan - welcome aboard!
 And yes... vibrations SUCK WIND... and I had my share. But let's address the codes first. 34 = MAP sensor low voltage. If this is bad, it won't be able to detect changes in manifold pressure, causing poor performance issues. 33 = MAP Sensor high voltage... You need a new MAP sensor!! The next code has to do with the transmission. If you have an automatic... 84 - 3-2 Control Solenoid Circuit ...or the manual... 84 - 2nd and 3rd Gear Block-out Relay Control Circuit 70mph vibrations... yee-ha... http://www.corvetteguruforum.com/modu ... hp?topic_id=17143&forum=1 Read through that thread, and pay close attention to the end of page 2. That's where I fixed the problem. If you have ANY questions regarding that thread, ask away! That's why we are here! |
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Posted on: 2012/8/25 19:00
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| oilcan | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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woo hoo!! thanks for the welcomes and party balloons!!
ok so im not crazy and the fsm did help with one thing lol.. ( the 2nd / 3rd relay) The big question is what effect is this having on the car and if i don't replace it right away is there a potential problem that could spring up or be exacerbated? So in the interest of the horsepower = happiness equation would it be beneficial to get a larger maf since I'm replacing it anyway? i have k&n but will have headers and full exhaust with muffler delete and chambered resonators by next spring if not sooner. not to mention i have a serous addiction the modifying everything i have so I'm sure as i do research and heed the guru guidance i will be doing many other things as well! can't say how great this forum is! and I've been a member at many other forms for other vehicles in the past but this is by far the most helpful and respectful ive come across!! |
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Posted on: 2012/8/25 19:32
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| 1Fast04Vert | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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Elite Guru
 
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Don't confuse MAP with MAF.
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Posted on: 2012/8/25 19:45
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| oilcan | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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lol wow im an idiot.. got it now!
that link was super helpful thanks again,.. looks like i have to verbally accost the mechanic that put in the u joints for me  what about the 2nd to 3rd relay.. any negatives if it dosnt get replaced till this winter? |
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Posted on: 2012/8/25 20:02
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1994 Black / Black coupe 6 spd 109000 mi ( on 8/27/12 ) |
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| BillH | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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The Stig Moderator
 
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Yep, your codes are for the MAP located on the rightside of the intake, just behind the Throttle Position Switch. The code list is on the second page of the secont book, 6E3-A-2. Code DTC33 on page 6E3-A-78, 34 0n page 80. |
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Posted on: 2012/8/25 20:04
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| BillH | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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The Stig Moderator
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6 speed right Adam. Unplug the connector at the trans, There are caps available that will keep the connectors clean. Most useless POS GM ever put on a car. Personnally, I wouldn't care about the relay code. Clear that code, it may not come back with the trans connector unplugged. |
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Posted on: 2012/8/25 20:08
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| oilcan | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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haha crap you say!! sounds good to me ill unplug that turd and be done with it. yup 6spd..
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Posted on: 2012/8/25 20:19
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| BillH | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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The Stig Moderator
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Yea, a GM fuel milage thing, won't let you shift to 3rd if the rpms are low. I unplugged mine the first day. |
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Posted on: 2012/8/25 20:23
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| bogus | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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Grand Imperial Pooh-Bah
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Take my thread, print it and show it to the mechanic. I will guarantee you have at least one ujoint overly tight in a half shaft. Also, there is no reason to remove the c-beam to remove the driveshaft. it can come out the rear. Just lower the exhaust from the rear - mufflers and diff mounts, and remove accordingly. The parking brake cable can kinda get in the way, just remove it from it's little hook and you will get more room. |
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Posted on: 2012/8/26 17:56
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| oilcan | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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thanks a ton Bogus!
awesome im so pumped, replaced the MAP car hasnt ran this well since i bought it! it must have been malfunctioning before the service light came on. so ive put on about 600 miles with that vibration, is there anything that could have messed up? also as a side note ive never been Locked out of any gears so it must have been peaced out before i got it? |
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Posted on: 2012/8/27 3:08
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| bogus | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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Grand Imperial Pooh-Bah
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and that is more then likely why it is throwing a code. The later cars were more sensitive to the solinoid being unplugged.
I assume you read the thread? If so, it lays out in extreme detail the cause of the vibration. As for other causes, tire balance a good start, as is the condition of the tires themselves. |
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Posted on: 2012/8/27 4:28
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| Matatk | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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If the CAGS (computer aided gear selection) is already unplugged and you care about the code, there is a little resistor to plug in there that the parts houses sell...ecklers, midamerica, corvette central, etc. I think it's around $30.
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Posted on: 2012/8/27 11:38
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| BillH | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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The Stig Moderator
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It's possible that you never shifted out of 1st at a slow enough speed or the trans connector is unplugged or there's a bad solenoid on the trans. 94 was the first year for code 84, unplugging the CAGS connector on the trans will not throw a dash light (SES) but may throw the 1-4shift light on the right side of the speedo (just ignore it). Code 84 will come back but just ignore it. BTW, you should clear the codes 33 & 34 and any others. Cool that the new MAP fixed the problem. |
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Posted on: 2012/8/27 15:08
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| oilcan | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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* I read the thread right away, very informative.. A lot of hassle for u but really a life saver for the rest of us!
I shift at very low Rpms regularly (2000 ish) ..and do skip 2 most of the time. Havnt had a chance to unplug it but will do so soon. Codes don't bother me as Long as I know why there there.. Since the map has been replaced it hasn't popped the service light. Thanks again, I'll update with Ujoint info when it gets taken care of. |
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Posted on: 2012/8/27 19:31
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| bogus | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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Grand Imperial Pooh-Bah
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don't be afraid to rev the motor a bit... it will help keep it cleaner, actually. Carbon buildup is more common under high load, and high load is when you are over loading the engine for the given rpm.
I hope the mechanic finds the u-joint. Everything I did is in there... I will review tonight if I missed something. |
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Posted on: 2012/8/27 19:36
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| oilcan | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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don't get me wrong, this car gets driven the way it should! I'm not afraid to get it in the red on a regular basis.. usually every ride! I doubt ill have any issues with carbon
I feel like i should just do it my self but its the principle of the matter... he messed it up so he should fix it.. it was the 1 thing i havnt done my self.. go figure |
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Posted on: 2012/8/27 23:29
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| BillH | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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You clear the codes to see if they come back. Not that the MAP will but it's good to have the cache empty so you can tell if the code is new. |
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Posted on: 2012/8/27 23:49
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| oilcan | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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UPDATE
car is back with the mechanic.. I've had some serious printer issues so he didn't get a copy of the the Bogus thread and he said his internet is too slow at the shop to look it up?!?!? (I'll try to print it tomorrow and run it over) he seemed skeptical at best. i dropped off the FSM with it and basically said use it :/ im nervous |
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Posted on: 2012/8/30 3:33
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| Matatk | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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Sounds like it's time for a new mechanic if he doesn't know how to clean and install u-joints. |
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Posted on: 2012/8/31 2:01
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| oilcan | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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I agree this was the first and last time he touches any of my vehicles. It was one of those things where a friend reccomended him and my regular mechanic only does vw's and particularly the diesels, so I needed to try someone else.
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Posted on: 2012/8/31 16:05
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1994 Black / Black coupe 6 spd 109000 mi ( on 8/27/12 ) |
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| bogus | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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Grand Imperial Pooh-Bah
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I am of a mindset that to own one of these cars you either need a deep pocket and a trusted mechanic, or, mad skillz.
These are not very hard cars to keep on the road, but they are victims of deferred maintenance. And that can hurt them big time. It really is hard when an 85k mile service could cost $4k - or more. Figure... Front wheel bearings - $300 each x 2 = $600 Rear wheel bearings - $200 each x 2 = $400 Flywheel - $1000 Clutck kit - $400 Ujoints - $250 (6 x $25 + screws and straps, $100 - these are pricy buggers, metric only and hard to find!) Optispark - $500 Waterpump - $200 Plugs - $60 Wires - $60 Oil Change - $45 (K&N + Mobil 1) Total: $3470 in parts alone. Some of the parts prices have been rounded up, which should absorb most sales taxes. The Opti price is kind of an average where the MSD is and a bit high for where the OEM is. Don't ever buy a reman. Same with the waterpump, OEM is the only way to go. And I haven't taken into consideration brakes or shocks. At 85k, they are nearing their end of life. Now... you're feeling sorry for yourself... huge expense... do the same maintence cycle on a Ferrari and that $3500 ONLY buys you the damned FLYWHEEL! Now, there are options, like using a steel Fbody flywheel and having it match balanced. That is a common mod and works rather well and will save you $800. Besides, the dual mass flywheels are getting hard to come by. |
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Posted on: 2012/8/31 16:25
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| oilcan | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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lol I hear that! im glad i didnt see these numbers before i purchased!
I have novice skills when it comes to car maintenance,but fabricate a lot so im no stranger to tools. Im assuming the prices are installed? rockauto has most of this stuff quite a bit cheaper. not the bottom of the line stuff either. |
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Posted on: 2012/8/31 19:03
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| Matatk | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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I could pretty much do a simple brake change before I bought my vette. Now I can change the brakes AND the fluid Quote:
Haha...nope! Quote:
Rockauto is where I buy 90% of my parts online. Check the forums for a 5% discount coupon code. |
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Posted on: 2012/8/31 19:45
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| BillH | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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The Stig Moderator
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Supprising.  |
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Posted on: 2012/8/31 21:26
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| bogus | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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Grand Imperial Pooh-Bah
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Yea, he stayed at a holiday inn express last night...
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Posted on: 2012/9/1 23:44
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| oilcan | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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[/quote] I could pretty much do a simple brake change before I bought my vette. Now I can change the brakes AND the fluid haha! yah im actually pretty excited about tackling these projects.. some day i hape to be good enough to change the blinker fluid! on another note the mechanic still hasnt finished the car.. dont think hes even started actually.. and the seal for the top leaks ... its raining like crazy as we speak, so thats nice too ( parked outside at his shop ) |
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Posted on: 2012/9/5 1:36
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| bogus | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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that sucks re: seal... been there, done that, got a wet knee.
I hope the mechanic fixes it tomorrow. |
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Posted on: 2012/9/5 3:15
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| bogus | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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Grand Imperial Pooh-Bah
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updates???
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Posted on: 2012/9/6 20:21
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| oilcan | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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finally got the car back yesterday!
Mechanic said he did indeed find 2 ujoints that "seemed" to be binding! I took it up to somewhere north of 100 and no vibration or even a hint of one was felt!! Mad props to Bogus and all the others involved in the original trouble shooting thread! Cant thank everyone enough! |
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Posted on: 2012/9/9 0:29
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| bogus | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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Grand Imperial Pooh-Bah
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Hurrah!!!!!!
I guess your mechanic learned some thin', eh? I am so glad to hear this. For a couple of reasons... one, it fixes your problem, but at the same time, validates my observations, which means others can learn from that, too! Great news!!! Just fantastic!!! |
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Posted on: 2012/9/9 0:46
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| Matatk | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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Glad you got it squared away!
Now time to change the muffler bearings |
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Posted on: 2012/9/9 15:28
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| oilcan | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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blinker fluid and muffler bearings are on my short list!
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Posted on: 2012/9/10 2:35
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| bogus | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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Grand Imperial Pooh-Bah
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don't forget... synthetic blinker fluid. Nothing but the best for a Corvette!
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Posted on: 2012/9/10 3:50
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| oilcan | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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took it up to 130 and now a rumble is back.. cant feel it too much in the shifter or steering wheel but the buttocks picks it up.... $h!T!!!! im putting in pst bushings up front and banski camber rods after a well deserved nap so ill see if that helps.. im guessing it won't...
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Posted on: 2012/9/15 20:52
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| bogus | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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Grand Imperial Pooh-Bah
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at 130, all bets are off, dude!
You might have a tire out, another off ujoint, out of whack brake rotor... even road surface will be amplified at that speed. To me, if my car is perfect to 120, I am ok... cause even at the long straight at Willow Springs, I won't get past 100. The freeways here in LA are so unpredictable... one chunk can be smooth and ok, a mile later, it will transmit a thrum through the chassis that will make you think the car is falling apart. It's hard to predict. |
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Posted on: 2012/9/15 21:27
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| BillH | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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Surely that's not on Big Willow. |
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Posted on: 2012/9/15 22:17
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| oilcan | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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to clarify after i took it up to 130 the vibration came back and now is noticeable at 60 mph.
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Posted on: 2012/9/15 23:56
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| bogus | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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no, Streets. |
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Posted on: 2012/9/16 0:29
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| bogus | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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Grand Imperial Pooh-Bah
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oh, I bet money you tossed a wheel weight. |
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Posted on: 2012/9/16 0:30
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| Matatk | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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I agree with Andy, check the tires. Most of the wheel weights now are stick on and they *ahem* are not made for 130...lol.
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Posted on: 2012/9/16 11:42
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| BillH | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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The Stig Moderator
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It's not a wheel weight guys.
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Posted on: 2012/9/16 13:24
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| bogus | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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Oh, Bill... what is it?
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Posted on: 2012/9/16 17:12
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| BillH | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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The Stig Moderator
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Don't know, Andy, I'm not in the car. But a lost wheel weight would show up at lower speeds. |
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Posted on: 2012/9/16 19:55
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| oilcan | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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ill check on the weights.. might just bring them in and have them spun monday just to make sure. after these banski camber rods go in (30 min) il take it back out and see EXACTLY what speed it comes on at.
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Posted on: 2012/9/16 20:20
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1994 Black / Black coupe 6 spd 109000 mi ( on 8/27/12 ) |
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| Matatk | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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Webmaster
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Quote:
Most of the threads I've read state the wheel balance issue come up around 50 mph+ Here are a few random sites that state the same: http://www.aa1car.com/library/tvibes.htm http://tirelily.hubpages.com/hub/BalanceOrAlignment http://wiki.answers.com/Q/Why_does_yo ... ing_wheel_shake_at_50_MPH http://www.thegeminigeek.com/what-is-wheel-balancing/ http://customwheelsmarket.com/diwhvi.html |
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Posted on: 2012/9/16 21:15
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| oilcan | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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Guru Newb
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didnt bring it in but they used the "pinch" type on the outer lip of the rim ( not happy about that ) and there isnt one on the other rim out back so im leaning towards a thrown weight. ill bring it in as soon as im able to and let yall know.
good references above too! |
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Posted on: 2012/9/19 2:18
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1994 Black / Black coupe 6 spd 109000 mi ( on 8/27/12 ) |
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| bogus | Re: code H 84 C 34 H 34 and C 33 and vibration from rear at 70mph | ||
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Grand Imperial Pooh-Bah
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Keep us posted!!!
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Posted on: 2012/9/19 6:22
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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