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Rough idle

Tiny
TINACHESS
  • MEMBER
  • 2001 HOLDEN COMMODORE
  • 3.6L
  • V6
  • RWD
  • AUTOMATIC
  • 180,000 MILES
Car idles rough, when driving runs better, engine shakes when idling, revs drops and threatens to stall. I have replaced air intake box and filter plus the hose. Cleaned the MAF sensor and throttle body recently which did not help. Spark plugs replaced a few months ago by mechanic friend. It does not feel like it is not running on all cylinders. I want to sell this car for approx $1,200.00 so do not want to spend a lot of money on it, but just need to get the idling right. It it has dual fuel but have not been running it. Thanks
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Wednesday, May 24th, 2017 AT 1:42 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,563 POSTS
Hello,

Lets start by checking the engines compression to see if you have a low cylinder which will cause the rough idle. Also lets so a vacuum leak test.

Here are two guide that will help you.

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

and

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Please run some tests and get back to us so we can continue helping you.

Cheers, Ken
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Friday, May 26th, 2017 AT 3:57 PM

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