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Re: Spark Knock is back.... and I figured out why... And it's BACK AGAIN!!!! |
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When I wrote about the smoke test, an exhaust leak or a crack in the header was on my mind. Coming to think about it, the LT1 has an O2 sensor on each side afaik and therefore I doubt both sides are leaking.
The recording nevertheless shows lean on both sides.
Posted on: 2011/10/22 16:03
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Re: Spark Knock is back.... and I figured out why... And it's BACK AGAIN!!!! |
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a thought... is it plausible that the dynaspark is sending garbage data that screws things up, but doesn't cause a code? Not likely, it would run rather rich, due to bad ignition timing. My 93 recording got a code 36 in it and it was a new bad opti! It only shows BLM and INT values on the rich side, even though it just has been tuned with LT4 hotcam. I personally prefer to look at the adl files with moving numbers, oh well. You sure got a major lean issue! Get yourself a smoker, close the exhaust and throttle body with tape and let him blow the smoke in with a straw, free at McDonalds ;-). The computer is for sure dumping a lot of fuel in (high inj pulse width numbers)to make up for the lean condition, but cannot get a handle on things. To much fuel robs you power, just like to little. BTW your IAC values seem to confirm the false air issue. Permanently low values and at idle closing altogether, not good! Unfortunately TPrt always gets some spikes in the recordings. For a split second almost all values max out, when it makes no sense. You'll learn to ignore this real soon. Don't forget, TP is a one man show for free, with a lot of support from the 3rd Gen guys to get a handle on things. No commercial interest behind the movement. The guy sure isn't gonna get rich from the voluntary support!
Posted on: 2011/10/22 10:50
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Re: Spark Knock is back.... and I figured out why... And it's BACK AGAIN!!!! |
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Hi Andy,
usually TPrt doesn't have a problem with Win7. Did you create an "adl" file prior to recording? You have to open "Select log file for rec/play" give it a name and hit record. Don't close the small window just minimize it. If a counter starts to run you're all set. No counter = nothing recording! Good luck. Axel BTW the recording from a 93 I got, also shows these injector errors, must be a software glitch.
Posted on: 2011/10/21 12:05
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Re: Spark Knock is back.... and I figured out why... |
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How relates "spark knock is back" in your heading to it, just curious? Does "is back" mean less knock or showing up again?
Just asking, because I am tuning an 88 4+3 stroker and it rather develops spark knock at low load instead of tip in knock, which puzzles me a bit. EGR has been deleted, but sounds like it might be false air, when I read this thread. As per TunerPro, BLMs are OK or rather on the rich side, supported by MPG calculations. Sorry for hijacking your thread. Axel
Posted on: 2011/10/14 10:50
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Re: how hard is it to clean/regrease the power door locks? |
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Grease will probably not cut it, try this:
http://www.corvette-guru.com/modules/ ... id=107088#forumpost107088
Posted on: 2011/10/6 9:24
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Re: Hello fellow C4 goons... |
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Well, if you know your way around with a soldering iron, did you replace the electrolyte capacitors? 26 years, those things are way overdue.
Posted on: 2011/9/21 8:18
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Re: quick tunerpro question - how do you know when your in closed loop? |
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How do you know if you're running rich or lean in open loop? Common senses, spark plugs, exhaust gases or wideband O2. New TP Version 5 has the "closed loop" checkbox on the bottom of "Show Data List Views". The old Version 4.x, which I still prefer, has it under "F" values.
Posted on: 2011/9/21 8:08
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Re: Think I found my mystery noise |
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Glad to hear it was something simple this time. I'll have to remember this one, when people talk about weird noises, this one is certainly a tough find, respect!
Posted on: 2011/9/13 12:08
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Re: Need to pick your brain on fuel rail leak, 91 L98 |
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I replaced injectors a few times now, but I'll never touch that fuel pressure regulator again!!!
Without a new seal/o-ring it's virtually impossible to hook it up without leaking. Get a new o-ring, without it'll be a loosing battle!
Posted on: 2011/9/13 11:59
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Re: 1994 LT1 running obscenely rich |
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First thing that came to my mind, ECM may have a low voltage feed? ....but that should increase idle as well.
How about TPS?
Posted on: 2011/9/1 9:41
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Re: sitting in car datalogging as I write... woot! questions now.... |
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I can't can I? i need the 1227727 vs 8 or something close to that? The 730_8D is the correct ads!!! It's the exact same internals as the 727 just a different housing/connectors. The 730 is for inside use, the 727 for under hood usage, that's why. TP V5 has problems with the CCM as well, use V4 and you're good to go.
Posted on: 2011/8/25 12:17
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Re: Cool new toy |
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Is there some sort of safety that would keep the rider from blowing their own head off? Hey, if we were perfect, we wouldn't have lost 2 wars Quote: I wonder how much weight the treads add? His little lady at the end of the video probably weighs less than those add ons. He told me, it's about 50 extra kilos or roughly 110 pounds.
Posted on: 2011/8/16 21:54
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Cool new toy |
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Took some pics and a video of a friends new toy, which you might like. Any Polaris owners out there???
Forget the yellow man, the Germans are re-arming again Enjoy [img][/img]
Posted on: 2011/8/15 14:18
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Re: Enjoyed my car tonight!! Finally |
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Thanks for sharing, must be real embarrassing?
I only remember a rant blaming the tune.
Posted on: 2011/8/11 14:11
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Re: Enjoyed my car tonight!! Finally |
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Quote:
Quote: Yes it was fairly simple. I don't want to die stupid, what was it?
Posted on: 2011/8/9 18:24
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Look what I found, to spark Tommys plug |
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Posted on: 2011/8/9 15:23
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Re: 1991 Injector Connector boots |
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No boots on my 91 either. Certainly stock, because I got it this way new in 91.
Posted on: 2011/7/30 11:04
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Re: House Pics (Before Shots) |
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Great little spot on this earth, congrats!
Quote:
I'am sure a lot of dogs in the neighborhood will join Tommy real soon
Posted on: 2011/7/29 16:06
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Re: Not to steal Tommy's thunder... |
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Congrats and good luck with the new hopefully nice neighbors.
What a great spot to park your C1, at least the little one . Any rooms for ---> ???
Posted on: 2011/7/29 15:57
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Re: 1986 Crank but no start enigma |
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Defective fuel injectors blocking each rail under load?
Try cranking it with only 6 injectors. Disconnect one on each side and play out the various possibilities. Don't forget the 9th injector. That sucker can block the whole system as well.
Posted on: 2011/7/29 15:36
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Re: 1986 Crank but no start enigma |
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The tune with VATS disabled takes care of the fuel part but not the starter.
Posted on: 2011/7/28 22:55
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Re: MF'r broke down....round two!!! |
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Glad I could help.
With my parts gone, your troubles are probably gone right with it. At least I hope so for you. Let's see what I can find next
Posted on: 2011/7/28 22:30
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Re: 1986 No start enigma |
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With the original eprom VATS gets the signal to ground the starter enable relay.
With VATS removed the relay isn't grounded and the car won't start. Either enable VATS in the new tune or ground the relay permanently. After I stranded a few times with VATS over the years, I thought it was a good idea to carry along an eprom with VATS removed. I too needed to short the relay to be able to start the engine with VATS removed.
Posted on: 2011/7/28 20:39
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Re: MF'r broke down....round two!!! |
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If you want to try my CS144, go ahead.
Seems like my parts list meets exactly your troubles. MOJO for your gear, though.
Posted on: 2011/7/24 23:01
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Re: 1st you say it, then you hit it |
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Thanks for making me feel so cosy. For a moment I didn't know which side of the pond I am
Ich verstehe leider nur Bahnhof . Kann man das essen?
Posted on: 2011/7/12 10:04
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Re: Throttle cable help (becoming urgent...) |
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Almost all brake handles of old bicycles have a cable ending like that, at least over here in Germany. Should look for a bike store to get the part, if you want to build the cable yourself. Good luck.
Posted on: 2011/7/10 17:56
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Re: It's ALIVE! |
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A never ending story does come to an end , cool!
Good luck on your tune and hopefully a good set of numbers on the dyno. Axel
Posted on: 2011/7/10 14:43
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Re: MF'r broke down....round two!!! |
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That's what I am saying, infinite on both measurements!
edit: That was a lot of nonsense, that's why it got deleted. W/O fingertips in the way, still infinite at 2000K-ohm at the button or ground. Maybe my cheapo meter isn't high scaled enough?
Posted on: 2011/6/18 12:09
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Re: MF'r broke down....round two!!! |
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Quote:
Tested that and it shows infinite ohms between rotor button and both battery and tach...which means it's bad. Sorry, mine does the same, that's probably not it. Between bat and tach leads you'll get zero resistance. Rotor button contact to ground is about 8K-ohm. Might want to try your old p/u coil? This little sucker can not always be determined good by measurements. Heat can do weird stuff to coils. Attach file: coil.jpg (45.46 KB)
Posted on: 2011/6/18 11:24
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Re: MF'r broke down....round two!!! |
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Quote:
no rpms when cranking Since you switched the module already, sounds like p/u coil or same old "drive gear". Good luck, Axel
Posted on: 2011/6/17 16:35
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Re: Rough start/Sometimes rough idle |
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...and there you go. Grey are the original Multecs and I've never experienced only one to fail, usually the entire bank gets into trouble. One injector is leading the way and the others are soon to follow. Do the simple ohm check, lowest scale on your meter. I bet those values are all over the place.
Posted on: 2011/6/17 10:32
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Re: Well it died on Saturday (engine) Carnage Picts added to last post |
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Unreal! If there is something like Karma, play the lottery, you'll probably win big
Posted on: 2011/6/15 21:24
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Re: 1987 C68 Electronic Climate Control Blower Issues |
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http://www.batee.com/corvette/acrepair/c68pgmrboard/index.htm
This link you can usually find in every HVAC thread about C68, but I post it once more. In addition to the resistors make sure to exchange the electrolytic capacitors as well. Common problem with all Delco/Bose stuff.
Posted on: 2011/6/10 19:26
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Re: 1987 C68 Electronic Climate Control Blower Issues |
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You do know, there is a head unit and a control unit above the gas pedal? In later models it's called A/C programmer.
Posted on: 2011/6/10 13:09
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Re: Running issue from yesterday....resolved? |
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ECM (since I had a comm error before when datalogging) If you mean that it froze up during recording, that is a known problem with the 7165 ECMs. Some seem to be better than others. Only thing that helps here, engine off for a minute or two. It's not a laptop, interface or program issue, just the ECM unfortunately. Quote: I'm gonna have to check my plugs, too, I think they might be fouled up from it running wrong for a bit. Nothing to worry about. When it runs well, that's burned up in no time.
Posted on: 2011/6/9 23:09
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Re: Running issue from yesterday....resolved? |
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I came home and swapped the MAF with a used one I have in the garage (borrowed from Woodstock - thanks Axel!) Great, finally you got a chance to check it for me. Glad it works, but somehow I got the strange feeling, it won't make it out of the States I trade it for some of your random crap
Posted on: 2011/6/7 22:48
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Re: data logging |
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Not sure how much you're in a rush to get going.
I am not a particular fan of Datamaster, since they don't support you when your laptop takes a dive or you upgrade to another. The license is only good for one computer, as far as I know. We got a fellow here in Germany, who seems to have got the missing link for the 94-95 CCM TunerPro issues. He made a first test and he seems to be on the right track. TunerPro is freeware and has a great movement behind it for the L98 engines. With the break trough, TP could be the way to go for LT1s as well. Here are a couple of my cables that I made for a bunch of guys here in Germany. It's good for all those various laptop softwares, like TP, TTS, EFI etc. Works with serial ports or USB. The reason for the model being, the circuit board is in the trunk ;-)
Posted on: 2011/6/1 11:16
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Re: ***** CAR SHOW VOTE ***** |
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BillH's C2 is my favorite, good picture too
followed by Ultraman's warehouse shot and SpectatorRacing action shot. The Vette I'd love to put in my Garage, next to my beater is the dark green from 95Vert and Tommy's dark red beauty. What the heck I'll take'm all, need a ship to address?
Posted on: 2011/5/31 13:59
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Re: I have had it with IE... |
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Long time FF user here as well. Stopped updating at Version 3.6, though. Read too many complaints at various boards with the new 4.0 version.
Posted on: 2011/5/31 13:34
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Re: 92 CDM |
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That is a CDM fault. I've got 2 of those CDMs with the same symptoms. I switched just about every part from a known good CDM to the bad, except the ICs and what seems to be an amplifier-IC with some 12-16 legs in upright position.
Would be great to see a returned CDM from those repair guys, with an open view to the circuit board to find out what they did.
Posted on: 2011/5/24 12:06
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Re: Compression Test electrical question |
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I guess I phrased my question too complicated.
Where does the ECM get the reference pulse for the injectors from? Would unplugging the IGN+ at the distributor take care of the signal, or would I have to unplug the tach signal as well? Or does neither help and I still would need to pull the INJ fuse? Thanks.
Posted on: 2011/5/24 9:24
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Compression Test electrical question |
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Hi Gurus,
the other day I made such a test on an 86 Vette and disconnected all injectors, just to make sure. Of course the ignition part was disconnected as well. Just wondering, if I only disconnect ign.+, would the injectors still get a pulse signal or was that overkill? I know I could have pulled the inj fuse as well, but just in general, do I need to do something to the injector side to avoid flooding? Thanks, Axel
Posted on: 2011/5/23 10:46
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Re: 1992-1993 ECM for sale |
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You asked for it, look at your PM.
In fact I just bought it, it's in the mail. Thanks for all your help. @Bill, never mind. I am just collecting data, to see what the so called "pros" are doing. Axel
Posted on: 2011/5/10 9:05
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Re: 1992-1993 ECM for sale |
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Here's another one real poorly advertised and not many followers. Maybe a potential bargain, who knows?
The Moates adapter pictured is worth about $35.- and the Memcal at least the same. I hope I am not raining on someones parade here.
Posted on: 2011/5/9 11:10
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Re: Intermittent Code 33 |
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Hi Matthew,
in my pile of parts there should be still a spare MAF. Just switch MAFs and see if the same thing happens with mine too? That's exactly what I got my spares for, troubleshooting those intermittent faults. Good luck, Axel
Posted on: 2011/3/31 20:49
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Re: 86 cruise control |
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From reading at different sites, that is part of the instrument cluster. Some are others aren't equipped for cruise control. You might want to check that first?
Posted on: 2011/3/16 18:55
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Re: C68 A/C Control Head in Dash |
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Cool, no need to rush at all. Great, 11 minutes later I had the answer. Must be reverse psychology, you may learn something from your kids real soon Oh, forgot to say thank you!!! Btw, my resistor reads 14 mega-Ohm, just a little bit off. The site to check those values is great, though. Thanks.
Posted on: 2011/3/15 13:18
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Re: C68 A/C Control Head in Dash |
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Cool, no need to rush at all.
Posted on: 2011/3/15 0:00
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Re: Scarab |
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The exhaust, yeah! The music rather suggests, it's made in China or an uprising star in porn movies
Posted on: 2011/3/13 16:31
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C68 A/C Control Head in Dash |
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Hi Gurus,
I didn't find a picture of the 84-89 circuit board anywhere, at least not the correct side. I would need to know the resistance value or the color code of the burned resistor. I marked it yellow on my board. The resistor right next to it seems to be the same. Does anyone got a spare and could take a look? I can only make out gold on top and brown on the bottom. Thanks Axel
Posted on: 2011/3/13 16:22
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