What causes SHUDDERING at 35-40mph (3rd gear) - Page 5 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 04-17-2005, 11:15 PM   #41
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Default TPS

You don't need a scan tool to set the TPS voltage at idle.
All you need is a small digital ohm meter to tap into the signal and ground wires
at the sensor with the key on (motor off).
I would just check your TPS voltage and see where it is.
Then you could move on to the next thing.
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Old 04-18-2005, 04:56 AM   #42
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Default Re: shudder

Quote:
Originally Posted by SSEBONNE4EVA
When I tweaked the TPS voltage to the center of the book spec. it corrected this.
Must have been something timing related.
I guess I'm a little confused... I thought you were implying that the ignition was missing in these high-load situations but tweaking the TPS got you out TCC lockup sooner, thereby avoiding the symptoms of the miss? Lol, did that make sense?

Whatever the case, I'm glad you've got it fixed. I'll be tweaking mine soon, plus installing my new Hayden 1404 tranny cooler.
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Old 04-18-2005, 10:53 AM   #43
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Default TPS

Imagine if you will a range between the two values, idle and WOT, with part throttle inbetween. This is the operating range of the sensor. Along this range, you have points at which certain upshifts occur, or downshifts, or power enrichment fueling, and finally a voltage that you hope the PCM recognizes as WOT.

I essentially wanted my sensor operating at the center of the factory specified range at idle. This would be the center of the range that the scan tool is suppose to see at idle.

Just check your voltage at idle and see if your off from the mean. You may not need to touch it at all.
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Old 04-18-2005, 11:05 AM   #44
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Default Re: shudder

Quote:
Originally Posted by big_news_1
Quote:
Originally Posted by SSEBONNE4EVA
When I tweaked the TPS voltage to the center of the book spec. it corrected this.
Must have been something timing related.
I guess I'm a little confused... I thought you were implying that the ignition was missing in these high-load situations but tweaking the TPS got you out TCC lockup sooner, thereby avoiding the symptoms of the miss? Lol, did that make sense?

Whatever the case, I'm glad you've got it fixed. I'll be tweaking mine soon, plus installing my new Hayden 1404 tranny cooler.
Thanks but I believe it was just the engine laboring in OD although its hard too tell exactly
what was going on other than to say it was a "chuggle".
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Old 04-18-2005, 12:40 PM   #45
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Default Re: TPS

Quote:
Originally Posted by SSEBONNE4EVA
Jwikoff: The throttle valve TV cable adjustment is set by releasing the readjust tap until the cable is farthest away from the throttle lever. then relase the tab. Now with (engine off) turn the throttle to wide open. until the readjust tab makes an audible click, then release.
There should be something in tech info on this.
I would mark the cable before and after to see if it changes the position.
Ok, terms I've not heard before. TV cable, the cable between TB and tranny? readjust tap? throttle lever?
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Old 04-18-2005, 02:05 PM   #46
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Default terms

OK they are not my terms, I was reading them out of the Haynes manual in the transmision section.
Oops, just checked my 96 it doesn't have the TV cable so you can disregard my comments.
I'll let you know if my car chuggles as I'm taking it on a highway drive tomorrow.
So far so good though.
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Old 04-19-2005, 10:18 AM   #47
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hey guys I decieded to check out this thread, bignews posted it in the other thread, but I have a question, is anyone elses trannies getting as hot as mine? my scan tool says the temp in the trans yesterday was about 204*F with the engine temp aroun 212*F and I noticed thats sometime around that 200 range is when I get the dreaded P0740 tcc failure, I do have an auxiliary cooler inline with the radiator, I forget what size it is now, I installed it back in Feb I think, but it was supposed to be way big enough for my size car, but not big enough to bypass the radiator, also I get the chuggle when I hit any kind of incline from 35 up to about 50 no matter the temp outside, and when you lightly give it more gas the chuggle gets worse untill it releases the tcc, but it seems like the tcc does not want to let go unless you get into the pedal, or tap the brake, but even with the trans temp at 204 it still shifted fine, should'nt it start acting wierd around those temps? could I just have a bad trans temp sensor?
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Old 04-19-2005, 10:24 AM   #48
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Andrew was posting 215 degrees of tranny temp in the "Where'* the quad 4 module" post. But he also knows his tranny is cooked.
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Old 04-19-2005, 10:50 AM   #49
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my trans dont slip or act funny at all, though it did shift very weird when I had the qdm fault, but before and after if seems to shift normal, other than the chuggle, I was thinking, the chuggle on mine could very well be ignition related, I say this cause now that I think about it sometimes I feel a miss while it idles, and the scan tool only rarely picks it up, it does have fairly new plugs and wires, I changed those back in the fall, might just see about the coils or even the module it self but that wouldnt explain the temp in the trans, is it supposed to get that hot?, I really think that has something to do with my tcc failure code, but with replacement computer I dont get the P0713 (trans temp high) code anymore
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Old 04-19-2005, 12:01 PM   #50
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Hrm, I don't know about that transmission temp... it still seems high based on what I've seen other people say around here. I'm surprised it'* getting over 200* with an auxilliary cooler installed. Does anyone else have thoughts on this?
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