Rough idle when warm?

Tiny
NATE083.0
  • MEMBER
  • 2008 FORD RANGER
  • 3.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 184,000 MILES
Rough idle more so when warmed up. Fuel pump, filter, coil pack, plugs and wires have been changed. Pulls good when driving just rough idle. Also, I've cleaned the throttle body and MAF sensor as well as cleaned the IAC.
Sunday, April 6th, 2025 AT 4:04 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,622 POSTS
A rough idle can be caused by low compression on one cylinder/leaky intake valve or a fuel injector going bad, I would remove all spark plugs and look for one that is dark in color, this will be the cylinder having the issue. Also, we should run the codes to see if any are stored.

These two guides can help:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

and

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

Vacuum leaks are famous for causing a rough idle as well.

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

Please go over these guides and get back to us.
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Monday, April 7th, 2025 AT 11:30 AM

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