1989pioneer Posted August 6, 2009 Share Posted August 6, 2009 I'm new to the form and i have an issue i would like to hear a differnt point of view i have a 1989 jeep comanche pioneer just got it on the road been working on it for a while now and never had an issue while accelerating i get a spudder not quite sure what it is when it is idling it is fine any thoughts. Link to comment Share on other sites More sharing options...
1989pioneer Posted August 6, 2009 Author Share Posted August 6, 2009 also my dad who also has comanche said it might have something to do with not having an exhaust. Link to comment Share on other sites More sharing options...
Wildman Posted August 7, 2009 Share Posted August 7, 2009 Your running it with no exhaust at all???? :no: If it a 4.0 (which you didn't post) the Renix 4.0 need some back pressure to operate properly. The best way to create back pressure is from the "stock" exhaust, Header down pipe, Cat and Muffler. Also, if it's "hesitating" when your taking off from a dead stop, you could have a vacuum leak. that would be a good all around check just to make sure that all the vacuum lines are connected. Link to comment Share on other sites More sharing options...
Geonovast Posted August 7, 2009 Share Posted August 7, 2009 A dying fuel pump or ballast resistor can also cause the hesitation. Letting us know if it's a 4.0 or 2.5 would help greatly. Link to comment Share on other sites More sharing options...
1989pioneer Posted August 7, 2009 Author Share Posted August 7, 2009 sorry about that it is a 4.0 and i just put a muffler on it and it did help so I'm gonna try and get a small cat on it cuz i am gonna put a stack through the bed near the cab. Link to comment Share on other sites More sharing options...
Wildman Posted August 8, 2009 Share Posted August 8, 2009 After I re-read you OP......... just got it on the road been working on it for a while now How fresh is the gas??? Link to comment Share on other sites More sharing options...
1989pioneer Posted August 9, 2009 Author Share Posted August 9, 2009 fresh 94 octane Link to comment Share on other sites More sharing options...
135Boom Posted August 26, 2009 Share Posted August 26, 2009 Several things can cause this. Vacuum lines for sure. TPS can be messed up. for me it was because I had bosch platinum plus 4's in the engine. Took those out and went back to the lovely stockers and the problem went away.... Wouldnt run premium unleaded in the motor. Not only is it a waste of money, but you could get worst performance from it. ...burns slower. 87 octane will ignite faster and is meant to be run in our low compression motors :) Link to comment Share on other sites More sharing options...
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