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Rough Idle

Tiny
SCOOP520
  • MEMBER
  • PONTIAC GRAND AM
I have a 2000 Pontiac Grand Am 2.4L 145,000 miles that has idle problems. When first starting off while the engine is still warming up the engine idle is fine when I come to a stop. When the engine is warmed up however, the idle becomes very rough when stopped in drive. Throwing the car into neutral smoothes it out. Car accelerates fine and runs smooth. Have replaced spark plugs, boots, and coils. No luck. No check engine lights coming on. Any ideas?
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Friday, September 14th, 2007 AT 7:16 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hello,

This sounds like it can be one of two things first is the MAF sensor is off a little not triggering the check engine light. Next would be the engine coolant temperature sensor has gone bad. Here are tow guides to help us get the problem fixed.

https://www.2carpros.com/articles/how-to-replace-a-mass-air-flow-sensor-maf

and

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

and

https://www.2carpros.com/articles/coolant-temperature-sensor-cts-replacement

Please run down these guides and diagrams and report back

Cheers
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Friday, September 14th, 2007 AT 8:44 PM
Tiny
SCOOP520
  • MEMBER
  • 2 POSTS
I had the OBD2 system scanned for codes. No codes came up during the scan so I replaced the MAF sensor and the car has never run better :) thanks for the tip.
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Saturday, September 15th, 2007 AT 11:14 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Use 2CarPros anytime, we are here to help. Please tell a friend.

Cheers
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Saturday, September 15th, 2007 AT 4:53 PM

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