Problems at idle and when turning - 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 03-08-2006, 12:48 PM   #1
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Default Problems at idle and when turning

Hi everyone...I'm a newbie and tried searching the forums first... but found nothing. I have two small problems I was hoping I could get some help with:

First of all, I have a 99 Bonnie SE w/ 86K miles that I purchased back in January.

1.) When the car is in gear and stopped, the car vibrates rather heavily. When in park and when accelerating, the vibration is lessened but still present. At coasting speed, either the vibration disappears or else it isn't nearly as noticeable. Car has no other idling problems other than vibration, and aside from the vibrating, the car drives great and engine runs fine.

2.) If making a sharp right turn, there is a slight pulsation coming from the LF that can be felt in the steering wheel. No such pulsation when turning left or making non-sharp turns. Most noticeable if brakes are not applied. Not sure if it'* related, but I've noticed an off-brake squeak developing from the same wheel.

Thanks in advance for your help!!
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Old 03-08-2006, 12:57 PM   #2
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As for the vibration hum 1st guess is the may need a tune-up. But check around the engine bay to make sure nothing loose. The other possible is to look at the enigine mounts make sure their are in good condition. One to check is to start up and give some gas don't rev over 3000rpm and look at the motor to see if moving around.
As for turning think where is thepulsation felt is noise,coming from the brake petal, steering wheel. I am thinking that answer is mostly like a wraped rotor.
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Old 03-08-2006, 01:02 PM   #3
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yes check the motor mounts by having someone watch the engine as you run it between reverse and drive with the brake applied... if it moves more than an inch you should start looking at what mounts need to be replaced

also check the vacuum lines on the top of the engine to see if any are disconnected, that wil cause the engine to shake and idle like crap. you can use carb cleaner and spray all over the lines to see if the idle changes.

if the LF wheel is pulsating while NOT braking, its not gonna be a warped rotor... does it pulsate while braking? get in there and see how the pads look
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Old 03-08-2006, 01:08 PM   #4
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Thanks for your prompt replies, guys. Here'* some more info:

1.) I was afraid you'd say motor mounts...i'll double-check how much the engine moves when revved, like you said. The car runs and accelerates fine, no hesitation, steady idle, decent gas mileage, etc...so I was worried it would be the mounts. Can anyone give a rough cost estimation for parts and labor?

2.) The pulsation is pretty faint, and I seem to notice it most when not braking. It only happens during sharp turns (i.e. U-turns), otherwise I never notice it when turning right onto cross-streets, turning into my driveway, etc. The steering seems fine overall, and doesn't feel loose...car drives straight, no drifting/pulling.

Thanks again for your help.
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Old 03-08-2006, 01:19 PM   #5
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Quote:
Originally Posted by 99Bonny83TA
1.) I was afraid you'd say motor mounts...i'll double-check how much the engine moves when revved, like you said. The car runs and accelerates fine, no hesitation, steady idle, decent gas mileage, etc...so I was worried it would be the mounts. Can anyone give a rough cost estimation for parts and labor?
Before we answer that one, do the check and see IF you have a motor mount problem and if so, which one. Then we can work on the cost issue. It varies considerably depending on which one is the issue. (and of course on labor rates).
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Old 03-08-2006, 01:22 PM   #6
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i really doubt that its gonna be a motor mount anyways, if its shaking in gear and not moving
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Old 03-08-2006, 01:58 PM   #7
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On the pulsating feeling. Only on a turn one way, check the CV boots for any tears. Also check the wheel bearings.
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