What causes SHUDDERING at 35-40mph (3rd gear) - Page 4 - 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 04-15-2005, 04:20 PM   #31
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Mine was rebuilt 34k ago. Now out of rebuild warranty.
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Old 04-16-2005, 03:30 AM   #32
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Like I said before, I'll let you know what I find out when the tranny cooler goes on. It'll be a few weeks, but I'll update this thread when I get it done.

jwikoff99..... I just noticed you live in Galesburg. I'm at college in Ames, IA right now, but my home is Muscatine, IA a little over an hour northwest of you. You going to the Minnesota meet by chance?
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Old 04-16-2005, 08:05 AM   #33
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Default The same here

my 93' sseisc doing the same thing at 35-55mph shakes, after 55- and up it goes a way.
but what i don't understand is my ses light comes on everytime i release the gas pedal.
(when car react operating temperature.) I get code 56 b fault. i replace egr, spark,wires
fuel and air filter, problem the same. i clean the iac sensor which help a little. does this problem relate to tcc or tps or maybe pcm?
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Old 04-16-2005, 10:19 AM   #34
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Default TPS

Guys Check your TPS voltage and let me know what you have.
You can definitley change the shift points with the voltage being correct.
Or check that your trans cable to the throttle is adjusted properly.
I'm convinced that at least on my car the trans was trying to hold OD under load
when it shouldn't have been.
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Old 04-16-2005, 10:50 AM   #35
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Hmm, that'* a thought, the cable. I've swapped my TB and had to adjust the cable. maybe I got it wrong.

But it did't show up for two years.

Big_news_1: I bought my car at Krieger'* in Muscatine. I haven't even really paid attention to the Minnasota meeting. I'll check it out.
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Old 04-16-2005, 12:58 PM   #36
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4EVA: are you assuming that your TPS voltage was off and you've got an engine miss that was only noticeable when under heavy load at low RPM? I definitely need to check my TPS, because just like your car I have the problem of trying to hold OD under high load conditions when it seems like it should unlock the TC or kick down a gear.

Is there a possible explanation why this problem never shows up unless the outside air temperature is more than 60? I'm still leaning toward tranny overheating, but I would also say that my TPS is out of line. The thing that really bothers me is that even if the TPS needs adjusting, the car SHOULD NOT surge under heavy load whether it'* pulling too high a gear or not. And as I said before, until the weather got warm, it would pull itself up long hills in OD with TCC applied and not chuggle in the slightest. I think I've probably got multiple issues here.

To get back to the original thread, you ought to check your TPS voltages, Hans. If you can modify your TPS to get rid of the surging you should definitely check it out. I would also suggest a tranny cooler because we've got 4T60s and they need the help anyway. But absolutely check all your ignition components before you move on to other things.
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Old 04-16-2005, 04:31 PM   #37
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Default coolers

Yah I've got the coolers so I ruled out tranny overheating.
Thats why I pursued timing / ignition issues.
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Old 04-16-2005, 06:07 PM   #38
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In that case I have to wonder what my problem is... I need a good scantool on my car to check everything once and for all.

4EVA: assuming you have an ignition miss with heavy load, what'* your plan to correct it? Or are you just living with your engine the way it is because your chuggle is gone after the TPS mod? Even if I can fix the chuggle by modifying the TPS, it would still bother me that my engine misses when loaded. Thoughts?
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Old 04-17-2005, 04:10 PM   #39
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Well, my tranny cable seems to be in the right spot. No slack until the very very end of travel with the TB shut. It will just barly wiggle where it mounts to the kickdown solenoid. Tighter would hold the TB open a bit. Looser would make it think there less throttle than there is. I got my fluid and filter changed. The shudder feels a little more surgy, but didn't go away in the least. I have considered ZZP'* TAC, which they say can remedy this situation on cars with with enlarged TB'* like mine. I'm not so sure it will help me, however, because the shudder didn't show up for two years after the swap. Nor do I recommend it for any car with this shudder that doesn't have a larger than stock TB. I'm dreading the thought that I might need ANOTHER tranny rebuild to actually fix the problem.
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Old 04-17-2005, 08:02 PM   #40
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Default EGR

this is the first weekend, i drove my car after installing the EGR and 02 sensor, and i notice i'm not feeling the shake when 35-55mph. about time. although i'm still getting
the ses lite when releasing gas pedal, goes a way when accelerating. Of course the code still the same 56 b fault. It comes on only when car react operating temp. today, it told a lot longer to come on, then usual. I just want to know if any one ever had to deal with something like this? 93' sseisc
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