2005 Buick Rendezvous Engine is loud

TIRGANG

MEMBER
2005 BUICK RENDEZVOUS
6 CYL
2WD
AUTOMATIC
102,000 MILES

Hi,

My engine is loud on my 2005 Buick Rendezvous. It's ok until I get into 2nd gear (about 10 mph). Doesn't seem to be an exhaust manifold problem as far as I can tell. One other thing I've found (I'm not sure if this is a real symptom and related or not) is that when I'm in park and rev the engine, the engine will go to 4000 rpms, and then drop down to 3000, and cycle back and forth between those 2 points if I'm holding the accelerator down.

Any ideas?

Thanks,
Todd

5 Replies

JACOBANDNICKOLAS

MECHANIC
108,262 POSTS

Does the engine idle normally? As far as the the high RPM's, that could be caused by a throttle position sensor or idle air control valve. Has the check engine light come on? Also, have you checked the entire exhaust system for leaks? Finally, does it sound like an exhaust leak or a ratteling?

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Tuesday, September 1st, 2009 AT 4:56 PM

TIRGANG

MEMBER
4 POSTS

OK, took the car for a spin and did a couple things after reading your reply. The car idles normally, and I couldn't visually see anything wrong with the exhaust system. Check engine light has not come on.

The sound it makes is similar to the sound it makes when you downshift at high speeds, except that the rpms are low (1000). I did find two things though - the sound is there when I shift into neutral, and the sound is still there, even when I turn the engine off. Sound seems to start / go away at a speed of about 20 mph. Do you think it might be CV joints? Wheel bearings? Something else? How I do figure out which?

Thanks,
Todd

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Wednesday, September 2nd, 2009 AT 8:44 AM

JACOBANDNICKOLAS

MECHANIC
108,262 POSTS

Todd:
A wheel bearing could make that type of noise. Here is how to check. When you hear it, make turns. If the sound changes, chances are it's a bearing. Let me know what you find.

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Wednesday, September 2nd, 2009 AT 8:50 AM

TIRGANG

MEMBER
4 POSTS

My wife took the car for a spin this morning, and found that the noise is better turning left, and worse turning right. Seems that the left (driver side) tire is the one making the noise. So it sounds like I need to change the left wheel bearing.

Very much appreciate your help!

-Todd

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Thursday, September 3rd, 2009 AT 9:04 AM

JACOBANDNICKOLAS