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| 1990Rudy | 90 ..just does not have it...? | ||
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Guru Newb
 
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I have changed.
plugs wires cap rotor coil Delphi fuel pump (i got the racetronics but the hook up was not right and it was getting dark so i went and got a Delphi) After that i took it for a ride and it ran very well. Off the stop sing it would spin the tries quite nice. Christmass day was dry and 43 out and i took it for a ride. Drove it on the highway for 20 miles and back ... just did not run like it did the 2 weeks prior. Now, I did try and adjust the idle with that little screw that is on the throttle body.. by doing that did i mess up the TPS ? it has both cats and it throws no codes.. |
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Posted on: 2011/12/27 14:12
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| BillH | Re: 90 ..just does not have it...? | ||
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No, that won't mess up the TPS but thet screw is set at the factory and doesn't have anything to do with the idle. I would check the TPS voltages though. "just did not run like it did the 2 weeks prior" , describe that a bit more if you would. Flat acceleration? No power? Miss? etc. BTW ,welcome to the forum. |
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Posted on: 2011/12/27 15:07
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Every man dies but not every man lives. |
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| 1990Rudy | Re: 90 ..just does not have it...? | ||
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Off a stop sign it would not spin the tires,,
Also i really gauge it off light acceleration.. You give it 1/4 throttle and it feels like the timing it retarded and the engine has to catch up. But in a slight way. It had a miss and that is when I put new plugs wires and cap rotor and coil on. ..Off to run a few to do's Steve |
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Posted on: 2011/12/27 15:13
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| TommyT-Bone | Re: 90 ..just does not have it...? | ||
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I'm gonna bow to the people that really know but I'm gonna throw these out there. Check EGR valve, O2 sensors, fuel filter and all your vacuum lines.
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Posted on: 2011/12/27 17:10
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| 1990Rudy | Re: 90 ..just does not have it...? | ||
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I forgot to add that the fuel filter was changed.
EGR now that would throw a code ? Or not ? but I will check into it. what about MAP and Fuel Pressure Regulator ? Now, also the when it is running with the hood up the Injectors sound loud ? tick tick tick When I was on the highway with a hell of a headwind.. But coming home it felt better but would not break tires lose.. I get so frustrated I am ready to take it to the MAYO CLINIC for CORVETTES .. If there is one. Steve |
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Posted on: 2011/12/27 17:54
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| Woodstock | Re: 90 ..just does not have it...? | ||
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Senior Guru
 
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Check resistance of all 8 injectors hot and cold and report back.
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Posted on: 2011/12/27 18:00
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91 convertible |
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| bogus | Re: 90 ..just does not have it...? | ||
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Steve - Welcome aboard!
 Sorry you are having issues. It sounds odd... that it would run great one day, poorly a week later. If anything, in the colder temps, it should run stronger, not softer. EGR may set off a code, but only if the solenoid is tripped. Have you cleaned the throttle body? A gummed up throttle body will kill the performance of these things. Gets carbon build up on the plates, inside the air flow circuits... ick-poo all the way around. Also, a bit of a sluggishness makes me wonder what is going on with the transmission. How many miles? I assume it is an automatic. You may want to check the TV cable. I don't remember the steps off hand, but I am sure someone does! Final immediate thought - the noisy injectors is pretty common. |
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Posted on: 2011/12/27 18:01
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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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| 1990Rudy | Re: 90 ..just does not have it...? | ||
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it has 81,000 miles. Yes Auto
Funny part is that the tach will read 3k RPM at like 75 MPH but from what i was told is the dash stuff on these is known to be a tad off. Even at idle it is off. (tach filer) |
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Posted on: 2011/12/27 18:09
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| 1Fast04Vert | Re: 90 ..just does not have it...? | ||
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That is more than a little off, like way off. Should be somewhere around 2K at 75mph depending upon which rear end option you have. |
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Posted on: 2011/12/27 18:13
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2004 Vert. 475hp. Built by Vengeance Racing |
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| 1990Rudy | Re: 90 ..just does not have it...? | ||
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If i am on the highway and I punch it I will Feel Vibrations in the drive line ?
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Posted on: 2011/12/27 18:47
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| Matatk | Re: 90 ..just does not have it...? | ||
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Welcome to the site.
Did it run fine before you changed these maintenance items? A few things: Messing with that idle stop adjustment (the little screw)will affect the idle by allowing more air past the throttle blades. This will also affect the TPS reading because the TB blades are more open. Did you pull the distributor to replace any items? I recommend you check your timing again. Double check the plug wires to make sure 1) they are not crossed 2) they are tight connections. The vibration on the highway is probably not related to your tune up. Most common problems are wheels out of balance/out of round or u-joints. Hope this helps. Matthew |
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Posted on: 2011/12/27 19:43
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| bogus | Re: 90 ..just does not have it...? | ||
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Grand Imperial Pooh-Bah
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I am assuming these are not good vibrations...  Sorry, couldn't resist.Question... do you feel the vibrations in your foot - through the pedal; or do you feel them in the seat - through your ass. It helps to focus where the vibrations are. 3000 RPM at 75? That is high, even for 3.07 gears. That's also NOT the filter. The filter will keep it from jumping about, not keep it from reading high. Reading high is caused by a bad tachometer itself. Do you have access to a laptop computer? I would love to know what is going on there. Do you know if the rear end was ever changed? At 81k miles, ujoints do become suspect. So do wheel bearings. |
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Posted on: 2011/12/27 20:16
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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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| tjpreul | Re: 90 ..just does not have it...? | ||
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I'm usually turning around 2300 at 75mph with 3.07's. Has anything been changed with the trans? Be sure to double check the fluid levels.
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Posted on: 2011/12/27 21:08
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Vegas wasn't built on winners. '92 auto, MSD, Banski, Taylor wires, SS lines, C5 rims, 3.07 gears, white gauges, seats from a '96. Motor: Forged rotating assy, Probe pistons, CC valvetrain, AFR heads, Procharger P1SC |
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| 1990Rudy | Re: 90 ..just does not have it...? | ||
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WOW, love the feedback ! i will test the injectors.
I paid to have the cap and rotor changed. Guys, it runs nice smooth and no miss it just does not feel like i remember a friends new 1990 Vette Running. The Vibration is probably a U joint or posi clutches ? it really is the lest of my worries at this time. I have a laptop yes .. tell me what to check and i will do it and report back. |
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Posted on: 2011/12/28 0:59
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| TommyT-Bone | Re: 90 ..just does not have it...? | ||
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Fortunately, removing ick-poo is easy peasy. |
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Posted on: 2011/12/28 1:06
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| Matatk | Re: 90 ..just does not have it...? | ||
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OK, I'm home so it's easier to look at a few things now. The TPS adjustment on the 90+ is automatic, the ECM reads the sensor at idle and adjusts based on that. Nothing to adjust there. But you can still adjust the base idle and timing correctly. Follow this procedure:
 Are there any mods to the car? Also, what rear end gear ratio do you have? If you have the economy/highway gear that is 2.59, you'll have trouble roasting the tires from a stop sign without a brake torque. Matthew |
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Posted on: 2011/12/28 1:11
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| Matatk | Re: 90 ..just does not have it...? | ||
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You will need an aldl cable to scan your car. You have to buy it off the internet from a site such as moates.com. Not really necessary right now. It's used for engine tuning and gives you more data than the paperclip method since you can watch parameters as the engine is running. Matthew |
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Posted on: 2011/12/28 1:14
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| 1990Rudy | Re: 90 ..just does not have it...? | ||
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Gear is no idea. it is a 90 convert... i bet it is a 2.59
it idles very nice. I will do this nest week and report back. THE TPS that is. Steve |
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Posted on: 2011/12/28 1:17
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| bogus | Re: 90 ..just does not have it...? | ||
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It's a little more involved than just the laptop, but, get the latest version of TunerProRT. http://www.tunerpro.net/ Reach out to fellow Guru "woodstock". He should be able to direct you on getting the right cables. The idea is that you can connect the computer to the car and see what is happening in real time. TunerPro is a real good choice because it is shareware. I am going to pay for my copy, because I believe in the product and want to support a fellow computer geek. I will say this, the user interface requires some getting used to. As for vibration, I would be shocked if it was the rear end, I would expect it to be ujoints or wheel bearings. Both are about due. I would also change the rear diff lube at the same time. Use either synthetic oil - I think either Royal Purple or Amsoil will do the job right - or conventional lube and 2 bottles of GM friction modifier. This is to help the diff clutches to work better. There is no factory change interval, but I base mine on mileage, and do it every 30k. |
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Posted on: 2011/12/28 1:21
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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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| 1990Rudy | Re: 90 ..just does not have it...? | ||
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yes, i love the Amsoil 75W90
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Posted on: 2011/12/28 1:45
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| bogus | Re: 90 ..just does not have it...? | ||
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Quote:
Check under the center console cover, or the drivers side rear compartment lid (don't remember which for 90 Verts). On the inside of the lid, there is a decal, white with lotsa print on it. Those 3 character codes are called RPO codes - Regular Production Order. Some are internal control codes, some refer to options, such as L98, or C68 if you have cruise control. List what you find and we can figure what you got! The key? G92. If you have G92, your car came with the uprated rear, from 2.59 to 3.07. But that still doesn't explain away the high RPM reading from the tach. |
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Posted on: 2011/12/28 2:05
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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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| 1990Rudy | Re: 90 ..just does not have it...? | ||
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Ill check
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Posted on: 2011/12/28 2:10
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| 1990Rudy | Re: 90 ..just does not have it...? | ||
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Yes there is a G92 code
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Posted on: 2011/12/28 2:19
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| Tiger05 | Re: 90 ..just does not have it...? | ||
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I am a FNG here too and I have a '90 convertible as well. Yes, I also have the G92 option. I bought my car on Dec 4th with a bad motor at 78k on the clock. I like to read the posts in this forum and others so I have an idea of what the issues are that may arise when I get the new motor in it. I can't wait to drive it.
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Posted on: 2011/12/30 16:24
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| hdfire | Re: 90 ..just does not have it...? | ||
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Quote:
Welcome Tiger05 and 1990 Rudy! You'll find some of the BEST guys here! VERY helpful and a lot of knowledge and experience. |
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Posted on: 2012/1/1 14:19
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| 1Fast04Vert | Re: 90 ..just does not have it...? | ||
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Tiger, what is wrong with the motor?
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Posted on: 2012/1/1 17:07
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2004 Vert. 475hp. Built by Vengeance Racing |
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| bogus | Re: 90 ..just does not have it...? | ||
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Grand Imperial Pooh-Bah
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Welcome Tiger!
And Rudy - in case I missed it Party for everyone!!! I'm with 95vette - what's wrong with the motor? 78k is about when the OEM head gasket goes troppo... |
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Posted on: 2012/1/1 17:48
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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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| Tiger05 | Re: 90 ..just does not have it...? | ||
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She is locked up tighter than Dick's hatband. I am going to tear into it this weekend and see exactly what the problem(s)are.
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Posted on: 2012/1/4 20:37
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| 1990Rudy | Re: 90 ..just does not have it...? | ||
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UPDATE : We have great weather here in Detroit so I have been tinkering with the car. I remember taking it to a wedding a year ago and i had the AC on. With the AC on it was about as fast as my dads 1981 K car ...back in 1981.. so I unhooked the AC. I also saw a hose by the passenger side rear that was hanging. it goes up to some black thing on the TPI I pluged it with a screw and went for a ride. It runs very nice..better that it has in a long time.
Thanks for the info and all the insight. |
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Posted on: 2012/1/6 20:56
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| 1990Rudy | Re: 90 ..just does not have it...? | ||
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Any idea of what the black thing on the TPI is ?
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Posted on: 2012/1/7 0:16
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| 1990Rudy | Re: 90 ..just does not have it...? | ||
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i guess it is a map sensor..
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Posted on: 2012/1/7 0:20
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| Matatk | Re: 90 ..just does not have it...? | ||
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Do you have a picture of the "black thing"?
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Posted on: 2012/1/7 3:06
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| 1990Rudy | Re: 90 ..just does not have it...? | ||
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yes Here it is ? Where does the other end of the hose go ?
thanks Attach file:  Vette black thing.jpg (70.32 KB) Vette black thing.jpg (70.32 KB) |
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Posted on: 2012/1/27 19:06
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| 1990Rudy | Re: 90 ..just does not have it...? | ||
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no idea why i have 2 shots of it.
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Posted on: 2012/1/27 19:07
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| Matatk | Re: 90 ..just does not have it...? | ||
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Yes, MAP (manifold absolute pressure) sensor. Used on speed density systems.
http://tpiparts.net/inc/sdetail/10956/426 Matthew |
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Posted on: 2012/1/27 19:22
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| Matatk | Re: 90 ..just does not have it...? | ||
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Other than that, how is the car running?
Where in Detroit are you? We have a few members in the area that may be able to give you a hand. Matthew |
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Posted on: 2012/1/27 19:24
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| 1990Rudy | Re: 90 ..just does not have it...? | ||
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14 & Woodward Area
so any idea of where I put the other end of the hose ? it seems to run better. |
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Posted on: 2012/1/27 19:32
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| Matatk | Re: 90 ..just does not have it...? | ||
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I have a MAF system, I'll try to find some emissions diagrams for the 90-91.
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Posted on: 2012/1/27 21:13
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| Matatk | Re: 90 ..just does not have it...? | ||
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Off the top of my head, though, it appears that it's coming from the plenum ports on the passenger side? If so, at least on my MAF, they go to the fuel pressure regulator and the check valve for the HVAC system. Does the heat air work correctly? Ie, blows out of different vents, or just out of the defroster?
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Posted on: 2012/1/27 21:15
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| Matatk | Re: 90 ..just does not have it...? | ||
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So you're in Royal Oak. I think Jon is out your way, he's very good with LT1s and I'm sure could lend you a hand. Maybe he'll chime in.
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Posted on: 2012/1/27 21:16
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| Matatk | Re: 90 ..just does not have it...? | ||
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Posted on: 2012/1/27 22:12
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| 1990Rudy | Re: 90 ..just does not have it...? | ||
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I think it does ?Ill check.. reason to drive it.
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Posted on: 2012/1/27 23:00
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| 1990Rudy | Re: 90 ..just does not have it...? | ||
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1) Ok, I can not figure out where the other end to that thing goes from the MAP. I just drove it.. runs great at WOT ..but you give it gas off a light it feels like it runs out of power at the top of the RPM before it shifts.
2) No the heat only comes out of the defrost ... It would not come out of the vents right toward me. 3) If that guy names John could chime in and come over ..Hell I will pay ! Thanks, Steve |
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Posted on: 2012/1/28 23:09
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| 1Fast04Vert | Re: 90 ..just does not have it...? | ||
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If the heat is only coming out of the defrost then it is highly likely that is the vac line that is supposed to go thru the firewall and to the HCAC controller.
LT1/4 vettes have an "F" shaped fitting on the right side of the intake with two lines coming off it. One line off the fitting goes to the HVAC and the other goes to the cruise control. |
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Posted on: 2012/1/28 23:41
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| Matatk | Re: 90 ..just does not have it...? | ||
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What Andy is referring to is what I suspected - that line more than likely goes to a " vacuum check valve" located on the rear passenger side of the plenum. It is easy to replace and should solve your vacuum problem as well as the heat coming out the defrost only. You can pick one up at any parts store for $5. It looks like this:
 You can find it here:  Hope this helps! Matthew |
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Posted on: 2012/1/29 2:31
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| Matatk | Re: 90 ..just does not have it...? | ||
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I also sent Jon (SpectatorRacing) a PM on your behalf to see if he's available.
Matthew |
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Posted on: 2012/1/29 2:36
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| 1990Rudy | Re: 90 ..just does not have it...? | ||
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Everything that you guys have assisted me with has helped.
ok, I will look today. I have to the the mountain bike down to get the hood opened. These old school 2 car garages were made for 2 model Ts. You know there is a lot of stuff on these cars. My 96 z-71 is nothing like this. And not because it is so open. Don't get me wrong it is fun as hell. |
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Posted on: 2012/1/29 18:43
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| 1990Rudy | Re: 90 ..just does not have it...? | ||
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Sorry not trying to sound like a complainer.
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Posted on: 2012/1/29 18:44
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| Matatk | Re: 90 ..just does not have it...? | ||
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Not at all! Off topic...what kind of bike do you have? I like to mountain bike, too. I have a 2009 Giant Rincon, although it's also hanging up for the winter, as well. Matthew Attach file: giant_rincon_2009_(street)_black.jpg (0.00 KB) |
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Posted on: 2012/1/30 0:31
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| 1990Rudy | Re: 90 ..just does not have it...? | ||
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just a old TREK
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Posted on: 2012/1/30 3:49
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