Vibration in the cabin only when idling?

GABEROSE

MEMBER
2004 GMC SAFARI
165,000 MILES

Hello,

My car repair shop performed the air intake cleaner with two cans of your products. I have a little more power than before but the main problem, the vibrations are still there in the cabin. The vibrations are in the cabin only when I am on D, N, or P, not driving. I can feel the vibrations especially in the steering wheel, the gear stick, seat, and some on the driver door. The car repair changed the engine mount and transmission mount as well as 2 Oxygen sensors, and also performed a your BG clean airways system 2 cans mixed together that clean all the airways with no results but all together quite expensive. Since I've already replace the engine mount and transmission mount, oxygen sensors, and I still have the vibration in the cabin - only can feel them when on idle, on the steering wheel, shift stick, seat, would it be wise to replace the idle control valve even if I don't have any "service engine soon: warning for it or anything else? Could you please let me know your thoughts or feedback if you have any to solve this.
Thanks, Gabe

1 Reply

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

Hi Gabe,

It sounds like you have low compression in one or more cylinders due to a burnt exhaust valve.

Here is a guide that goes over the popular causes of a rough engine idle:

https://www.2carpros.com/articles/repairing-engine-rough-idle-issues

You may have a camshaft lobe that is wearing done as well, can I ask if the engine is making a ticking noise?

This guide can show you how to check the compression so we can rule that out:

https://www.2carpros.com/articles/how-to-test-engine-compression

Also, I would check the spark plugs upon removal for cracks and make sure the gap is correct.

0.060 inches (1.52 mm).

Please upload pictures or videos in your response of any problems so we can see what to help you with.