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My car Revs up and down but doesnt die???

Old 05-09-2006, 10:18 PM
  #11  
characteristics
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revs up and down warm cold hot anything before it would just do it everyonce in a while no it does it pretty much all the time unless it is idling for 5 or more minutes then it USUALLY idles good. and it hessitates everyonce in a while too.
Old 05-09-2006, 11:08 PM
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Chefboiali
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Originally Posted by characteristics
revs up and down warm cold hot anything before it would just do it everyonce in a while no it does it pretty much all the time unless it is idling for 5 or more minutes then it USUALLY idles good. and it hessitates everyonce in a while too.
I had my P28 ECU stolen, and had it replaced with a P28 from an automatic. The up and down reving came from having an automatic P28 in a 5-speed car. I tweaked the P28 and it stopped. Has your ECU been replaced?

Last edited by Chefboiali; 05-10-2006 at 07:09 AM.
Old 05-10-2006, 02:18 AM
  #13  
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yeahs sounds like ur IACV...
Old 05-13-2006, 07:14 PM
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tommyhcky13
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mine use to do that and it was a vaccum leak. lots or searching through hoses solved that one
Old 05-16-2006, 07:35 AM
  #15  
characteristics
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i cleaned out the IACV it didnt really make a difference when the motor is cold and i start it it doesnt rev up and down for about a min now that is the only difference. any more ideas?
Old 05-16-2006, 07:37 AM
  #16  
RicoD
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HAve you checked for vacuum leaks?
Old 05-16-2006, 07:49 AM
  #17  
characteristics
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I have checked. Is there a special way to check? What I did was un plug one side of the hose then plug the hose and the nipple. Is that what your supposed to do?
Old 05-16-2006, 08:03 AM
  #18  
RicoD
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That could work, but the hose itself might have a hole that you can't see... I sprayed engine cleaner the last time I had one and it was bubbling so I replaced it with a new one h: That might be over kill though but it worked for me
Old 05-19-2006, 05:51 PM
  #19  
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Check your fast idle thermo valve. Do a search on how to fix or replace it.

Last edited by VPUPPY; 05-19-2006 at 05:54 PM.
Old 05-21-2006, 06:57 PM
  #20  
96scgsrcoupe
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Yeah same problem with my gsr. The fit valve wasnt working properly.


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