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2001 Hyundai Elantra Poor idle

Tiny
RICKY55
  • MEMBER
  • 2001 HYUNDAI ELANTRA
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 60,000 MILES
Engine was vibrating at idle, gets worse when AC is on. I installed new spark plugs, wires and PCV. I did not find any vacuum leaks and the spark plugs were clean no oil residue from bad spark plug seals. The motor mounts are all good, no play and there is 20000 miles on the timing belt. Compression is good. No codes and mil is operating correctly. I am running out of options, should I try isolating each fuel injector? The car does not hesitate and pick-up is good.
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Tuesday, June 1st, 2010 AT 9:03 PM

1 Reply

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Is this a misfire or an engine vibration? Has it ever set a check engine light? Try blocking the wheels, setting the e-brake and have it in D, unplug injectors one at a time quickly to see if it gets worse. If you get one that doesnt make a difference, that will be the offending cylinder. If none of them make a difference you may be dealing with an engine vibration, double check the mounts to be sure you dont have one that is collapsed a little. Why was the timing belt already changed (20k on new belt, 60k on car)
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Wednesday, June 2nd, 2010 AT 12:35 PM

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