bigborebates Posted July 10, 2008 Share Posted July 10, 2008 just bought the truck,( second one my wife is getting a little upset i think i have the bug pics to come soon as well as project summery) 1988 jeep comanche, 4.0, pukegoat 5 speed, np 231 133k miles it has a stuttering problem with very little throttle applied in all gears but you can power through it with more throttle, if held there it will continue to pop and stumble unless you just under or over that spot. i checked tps and it was fine but replaced it with another anyway i checked cap and rotor and wires and plugs all were new and recently put in. i replaced fuel filter and ran injector cleaner through system still there. i am not thinking in the direction of fuel system due to low load seems to be same spot or load situation what do you genius COMANCHE owners think thanks in advance Link to comment Share on other sites More sharing options...
bigborebates Posted July 10, 2008 Author Share Posted July 10, 2008 TTT :chillin: Link to comment Share on other sites More sharing options...
mvusse Posted July 10, 2008 Share Posted July 10, 2008 Might this be the distributor indexing problem? Anyone? Link to comment Share on other sites More sharing options...
fiatslug87 Posted July 10, 2008 Share Posted July 10, 2008 Have you checked the EGR valve? http://comancheclub.com/forums/viewtopi ... highlight= Link to comment Share on other sites More sharing options...
ejndssn Posted July 11, 2008 Share Posted July 11, 2008 Have you checked the EGR valve?http://comancheclub.com/forums/viewtopi ... highlight= i would agree with that since it may be the original Link to comment Share on other sites More sharing options...
BLHTAZ Posted July 11, 2008 Share Posted July 11, 2008 Check EGR, IAC, MAP, plugs and fuel injectors. Distributor is a slight possibility, but due to the fact that it gets better with more throttle, I am not thinking in that direction on this one. Link to comment Share on other sites More sharing options...
Eagle Posted July 11, 2008 Share Posted July 11, 2008 A friend's stroker did that when it was running lean. He played with an adjustable MAP sensor to richen it a bit, but in the end he went to larger injectors. I'm not saying you should go to larger injectors on a stock vehicle, but this could nonetheless be fuel related. First, it may just be old gas that doesn't have much "oomph" left in it. It could also be a partially plugged fuel filter. That's on the driver's side frame rail, approximately beneath the driver's seat. I'd suggest changing the filer, running a couple of tanks through it with some good injector cleaner mixed into fresh gas, and see if it clears up. Link to comment Share on other sites More sharing options...
bigborebates Posted July 11, 2008 Author Share Posted July 11, 2008 Thanks again for the help i will check those things out and let you know :cheers: Link to comment Share on other sites More sharing options...
BLHTAZ Posted July 11, 2008 Share Posted July 11, 2008 You can get a set of fuel injectors HERE for a very resonable price. If you use the word ' JEEP ' as a discount code at check out it should take 10% off as well. ;) I use these injectors as well as several other folks on here and they are great. I got a 14% increase in MPG as well as a much smoother running engine and better acceleration from the swap. Link to comment Share on other sites More sharing options...
fiatslug87 Posted July 11, 2008 Share Posted July 11, 2008 bigborebates, pm'ed you Link to comment Share on other sites More sharing options...
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