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1999 Mitsubishi Eclipse Rough Idle

Tiny
BILL1957
  • MEMBER
  • 1999 MITSUBISHI ECLIPSE
  • 2.0L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 247,000 MILES
Car idles rough and RPM's fluctuate between 600 - 900 while at a standstill. Sometimes I can feel a little missing while driving. Used an OBD2 analyzer and it showed code $40 and code $41 but I can't find any reference to what they stand for. I've replaced the MAP sensor, intake manifold air temp. Sensor, idle air control sensor and coolant temp. Sensor. Replaced spark plugs and wires.
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Monday, October 13th, 2014 AT 9:33 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
I would start with a compression test,

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

If a cylinder is a little low, suspect the intake valve leak on that cylinder which will cause a rough fluctuating idle.

Please let us know what you find
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Monday, October 13th, 2014 AT 10:32 PM

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