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  #1  
Old 07-14-2006, 08:21 PM
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Question Does this sound like a timing belt issue or IAB valve?

When at idle (after my engine has warmed up) my engine has a slight vibration. This is mainly while at stoplights when the car is sitting in "D". It is not that bad but it is enought to rattle the stuff in my door handles (I put my sun glasses or cell phone there sometimes) or it causes a slight rattle in the plastic pieces in my interior. It doesn't matter if my AC is on either. Could my timing belt be a "cog off" or is my IAB (Idle Air Bypass) valve dirty? The car runs well and performs normal in all other ways.

Thanks for the help
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  #2  
Old 07-15-2006, 08:18 AM
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is the enine actually idling rough or is it more or less just a vibration. Bad motor mounts could cause a vibration like that

TOm
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  #3  
Old 07-15-2006, 10:44 AM
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Significant Technical Input
Timing belt - no.

IAC - no, unless it's idling at 300 rpm and about to stall.

Sounds like one or more misfires, to me.
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  #4  
Old 08-25-2006, 10:54 AM
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Thanks

Thanks for the response. Car had been acting worse as far as performance. It is hesitating (more than usual) when cold and at low RPMS with the torque converter in lock-up the engine hesitates. I'm going to replace the fuel filter to see if there is any change. It's been a long while since I replaced it.
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Old 08-25-2006, 06:46 PM
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[QUOTE=SVX JAZZ]Thanks for the response. Car had been acting worse as far as performance. It is hesitating (more than usual) when cold and at low RPMS with the torque converter in lock-up the engine hesitates. I'm going to replace the fuel filter to see if there is any change. It's been a long while since I replaced it.[/QUOTE

I will back Beav and say coil/coils or plug/plugs.
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  #6  
Old 08-26-2006, 06:39 PM
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Thanks, replaced those

Thanks, I tested and replaced two bad coils, replaced spark plugs and also put in new injectors about 2 years ago. The bad coils were actualy causing backfires. No backfires now just hesitation.
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