2000 Pontiac Grand Am engine

NINEBALL

MEMBER
2000 PONTIAC GRAND AM
4 CYL
2WD
AUTOMATIC
117,000 MILES

Car shakes at idle after warm up

Wednesday, December 10th, 2008 AT 3:28 AM

3 Replies

KHLOW2008

MECHANIC
41,814 POSTS

Hi nineball,

Thank you for the donation.

What is the idling speed after warming up?
Do you have symptoms of hesitation, misfiring or lack of power?
Any difference when in Park or Neutral and othere gears?

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Wednesday, December 10th, 2008 AT 5:26 AM

NINEBALL

MEMBER
2 POSTS

Idles at 750 rpm after warm up, no lack of power but a slight hesitation as it is refed. Cant hear a miss when driving. It has plenty of power at normal dring speed. Just shakes at idle after its warm. No change in different gears. Noticed it would shake more when I loaded the battery more like when I would use the power windows. So I pulled off the drive belt to see if it was the alternator bogging down the engine. Small improvement but still shakes.

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Thursday, December 11th, 2008 AT 3:48 AM

KHLOW2008

MECHANIC
41,814 POSTS

Hi nineball,

From your description, seems the engine mounts are not in good condition.

Try usiing a floor jack with a small plank on top and using it to support the engine oil sump lightly and if the vibration disappears, the engine mount needs to be loooked into.

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Thursday, December 11th, 2008 AT 6:52 AM