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Rough idle

Tiny
JACK NIC
  • MEMBER
  • 2002 CHRYSLER PT CRUISER
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 182,000 MILES
Very rough idle in or out of gear, no codes showing. Changed coil, wires, plugs, and new intake plenum seals. No change.
Friday, May 10th, 2019 AT 8:14 AM

3 Replies

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Hi Jack,

Have you checked mounts? These vehicles are known for having engine mounts wear out and they ground the engine and you feel all the engine pulses through the vehicle.

If these check out okay, let's look at what the engine data is telling us. Can you send me the short term and long term fuel trim data while it is running rough? We can see if it is actually misfiring or if it just feels like it.

Does it run rough only at idle? If so, have you run a compression check? If not, I would definitely do that assuming the engine mounts are not your cause.

https://www.2carpros.com/articles/engine-vibration-at-idle

https://www.2carpros.com/articles/how-a-motor-mount-works

https://www.2carpros.com/articles/vibration-noise

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

https://www.2carpros.com/articles/how-to-test-engine-compression
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Friday, May 10th, 2019 AT 4:04 PM
Tiny
JACK NIC
  • MEMBER
  • 2 POSTS
I believe it could be mounts as the ones on this car are worn out. Thank you. It has been tough to think as I am going through chemo treatments. Again thank you.
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Monday, May 13th, 2019 AT 7:29 AM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
I totally understand. We are here to help whenever you need. Please take care and let me know what you find. Thanks
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Monday, May 13th, 2019 AT 5:40 PM

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