Car shudders in high gear under load - transmission? - Page 3 - 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 03-06-2003, 11:12 PM   #21
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Way cool. Keep us posted until you're at 100%. I'd like to see all the contributing factors. I'm still wanting to see your plug wires changed, too. They can feel just like an old fuel filter when they get bad.
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Old 03-07-2003, 07:13 AM   #22
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I will change the plugs and wires. I'm going to order some Taylor wires, so it will take some time for me to get them. I'll get a new air filter, plugs and fuel injector cleaner to put in the gas tank today. (Just the FI cleaner goes in the tank, not the filter and plugs) I'll try to get the filter and plugs replaced today, not sure if I'll have time. I have a new front wheel bearing and axle shaft to replace this weekend too. Think I'll order a new O2 sensor too.

Anybody have a favorite fuel injector cleaner to put into the tank? Thanks again.
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Old 04-03-2003, 09:07 AM   #23
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Just an update on my car shuddering under load. I replaced the fuel fulter, PCV, air filter, AC O2 sensor, AC regular plugs and ran a couple tanks of gas with Gumout fuel injector cleaner in them. I've got Taylor plug wires ordered, but they aren't in yet.

The car still shudders at times under load, but not as bad as it did. So the above items helped a little, but didn't cure the problem. Guess it'* still in the tranny somewhere.

I've had the car for 22,000 miles, and it did it when I bought it, so I'm not too worried about it. Thanks for the suggestions.
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Old 04-03-2003, 09:50 AM   #24
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Quote:
Originally Posted by jr's3800
I use either slick 50 or dura lube fuel system formula.... $8 to $10 a bottle but it does a good job...




jr's3800 have you used these items a bunch? i looked into using them once...but i thought well i see stupid infomercials about these products...i donno about them...and went for a more $$ one. however if you guys here back them itd be nice to grab hte cheaper one.
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Old 04-04-2003, 03:36 AM   #25
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Try changing your tranny fluid and filter. This might get your car to 100%. In my old tranny I had a shudder problem and when I changed my fluid , problem was solved ! Unfornately it blew up two weeks later....
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Old 04-04-2003, 09:56 AM   #26
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Same thing happend to my car. I could have sworn it was the tranny.. but it just ended up being the spark plug wires. What was happening is when the car was under a lot of load, and pumping alot of gas into the cylenders, one of my spark plugs didn't have enough spark to fire all the gas. Thus the shuttering under a lot of load. Made my v-6 into a 5 and a half.
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Old 04-07-2003, 01:30 AM   #27
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I had the same problem, swore for years it was the tranny but I read that the ignition system on these cars is too weak for the supercharger, so I bought new plugs and closed up the gap to 0.45" and the shudder went away.

Dave Porter
92 SSEi 120,000 miles For Sale
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Old 04-07-2003, 01:55 AM   #28
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For what its worth, when I had a broken spark plug, I could not get the car above 50mph. From 0-50 you wouldn't even notice. Once you hit about fifty, the car started jerking and I couldn't get it any higher. I had broken one of six new plugs when I put them in.
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Old 04-07-2003, 03:45 AM   #29
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If there is an AutoZone near you they will scan the car for free. Provided your SES is on.

TuType
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Old 04-17-2003, 01:28 AM   #30
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I am experiencing the same thing in my 93. Mostly happens during highway driving when I come up on hilly terrain. It feels like the engine is trying to hop out from under the hood. Taking my foot off the gas or stepping on it will make it stop. It'* pretty unnerving when it happens, but mine has been doing it for a year and I just keep on driving. I figured that it is transmission/torque converter related and therefore too expensive to fix. I'll try the tune up first, but it just seems too simple.
thanks,
Detlef
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