JeepTruck Posted April 4, 2009 Share Posted April 4, 2009 First off thank you to everone who responded to my last post. Ok now what newer EFI system from another Jeep would be a fairly easy swap into my brothers truck? Thanks again to all for your help. Dave Link to comment Share on other sites More sharing options...
Pete M Posted April 4, 2009 Share Posted April 4, 2009 What is in your brother's truck now? Year? Link to comment Share on other sites More sharing options...
JeepTruck Posted April 4, 2009 Author Share Posted April 4, 2009 Sorry its an 87 4.0. Link to comment Share on other sites More sharing options...
BLHTAZ Posted April 4, 2009 Share Posted April 4, 2009 What is wrong with what you have? There would be NOTHING easy about swapping in a system from another Jeep. It will require a new computer, new sensors, new wiring harness etc, etc... Doing something like that would make absolutley no sense. The Renix system (that he has) is simpler to work on and works great... :dunno: Link to comment Share on other sites More sharing options...
Pete M Posted April 4, 2009 Share Posted April 4, 2009 What all is wrong with his truck? Link to comment Share on other sites More sharing options...
JeepTruck Posted April 4, 2009 Author Share Posted April 4, 2009 Ok my brother has 87' Jeep comanche with 4.0 liter with 200.000 plus miles on it. In the winter time its starts ok but in the summer it will start when its cold but once it warms up you are stranded it will crank all day but it will not start. I thought fuel injection was supposed to due away with vapor lock so I don't think thats what it is. He says that adding wooden clothes pins on the fuel rail (multi port injection) seem to help the starting problem, but this was near the fall when the weather got cooler. I drove the truck allot this winter and never got stranded. It does seem to crank allot more to start then most fuel injected vehicles then I am use to, I don't know if this will help diagnose the problem. He bought the truck a year ago in the winter so problem didn't show up till this past summer, and like I said no issues with it this winter. Thanks in advance for everone's help Dave Link to comment Share on other sites More sharing options...
Pete M Posted April 4, 2009 Share Posted April 4, 2009 Fuel injection does do away with vapor lock. It's not vapor lock. Might be a faulty fuel pump resistor, or CPS. Link to comment Share on other sites More sharing options...
BLHTAZ Posted April 4, 2009 Share Posted April 4, 2009 Fuel injection does do away with vapor lock. It's not vapor lock. Might be a faulty fuel pump resistor, or CPS. :agree: Changing the injection system will not solve your problem, but rather, it will create more most likley. Like I said in the other thread, you need to diagnose it when it won't start and find out if the problem is fire or fuel, then we can go from there and narrow down what is causing it. Link to comment Share on other sites More sharing options...
james750 Posted April 4, 2009 Share Posted April 4, 2009 My guess is CPS. On another note, how many cranks does it usually take to start? My MJ usually takes 5-7. My white 97 XJ takes 2-3 and my blue 97 XJ takes 15-20. Link to comment Share on other sites More sharing options...
Geonovast Posted April 4, 2009 Share Posted April 4, 2009 Fuel injection does do away with vapor lock. It's not vapor lock. Might be a faulty fuel pump resistor, or CPS. I thought the resistor was bypassed during startup? Link to comment Share on other sites More sharing options...
Pete M Posted April 4, 2009 Share Posted April 4, 2009 :doh: You are correct. :thumbsup: Link to comment Share on other sites More sharing options...
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