trapperbb Posted May 15, 2009 Share Posted May 15, 2009 When my comanche first starts latley it seems to be reving quite high for about 10 seconds then once u put it into drive it stops. Does anyone know what causes this? thanks. Link to comment Share on other sites More sharing options...
BLHTAZ Posted May 15, 2009 Share Posted May 15, 2009 Most likely it is the IAC. You need to remove the throttle body, take the IAC and TPS off of the throttle body, clean it REALLY well, clean the IAC shaft seat, and then reassemble everything. You will have to set the TPS back to proper specs when you are done. CLICK HERE for the how-to on the TPS adjustment. If that doesn't fix it, then the IAC is probably going bad. Link to comment Share on other sites More sharing options...
ComancheKid45 Posted May 15, 2009 Share Posted May 15, 2009 Ive been having this issue as well and even after replacing the IAC and cleaning everything completly it still does it now and then.....Its a jeep thing to me, i can live with it :yes: :smart: Link to comment Share on other sites More sharing options...
BLHTAZ Posted May 15, 2009 Share Posted May 15, 2009 Mine does it occasionally (like once every 5-6 weeks maybe) too, but if it's consistent, something needs to be done. Link to comment Share on other sites More sharing options...
CWLONGSHOT Posted May 16, 2009 Share Posted May 16, 2009 Has anything changed with this vehicle before the problem arose? I mean have you changed or altered anything recently? A manifold vacuum leak will also do this BTW... CW Link to comment Share on other sites More sharing options...
BLHTAZ Posted May 16, 2009 Share Posted May 16, 2009 Has anything changed with this vehicle before the problem arose? I mean have you changed or altered anything recently? A manifold vacuum leak will also do this BTW... CW True, and I had an issue where I changed the battery cables, and moved the ground to a different spot, which caused a severe high idle problem on mine. Link to comment Share on other sites More sharing options...
trapperbb Posted May 19, 2009 Author Share Posted May 19, 2009 the only thing i did was put some new bearings on the axles but it seemed to have stopped now thanks for the help :cheers: Link to comment Share on other sites More sharing options...
87ComancheLB Posted May 19, 2009 Share Posted May 19, 2009 My 87 4.0L would do this all the time was driving me crazy constantly blipping the throttle trying to get it back down, was like constantly on the choke mode, sometimes would go back down. Once I replace all the fuel injectors with new 4 port (instead of 2 port) idles like a dream, gas mileage improved, and more power! :cheers: Link to comment Share on other sites More sharing options...
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