terrawombat Posted March 24, 2009 Share Posted March 24, 2009 Could possibly be unrelated - but the ground wire going to my fuel pump is very finnicky. Sometimes I have a good ground sometimes I don't. Obviously when the ground sucks, the truck won't fire up because the pump just won't kick on. I've put a jumper wire from the ground terminal directly on the fuel pump body to a spot on the frame that I wire wheeled down the bare metal and haven't had a single starting problem since. However, if this was your problem, you wouldn't see any pressure at the fuel rail when the truck was having trouble starting. I don't know if you ever mentioned if you had fuel pressure at the rail when the truck wasn't starting for you or if you ever even tested it under that circumstance. Link to comment Share on other sites More sharing options...
500 MJ Posted March 24, 2009 Author Share Posted March 24, 2009 Didn't test it then. I never thought to... Link to comment Share on other sites More sharing options...
500 MJ Posted December 8, 2009 Author Share Posted December 8, 2009 Well, I've obviously got the truck running now. Its been running GREAT for the last 5 months since I got it on the road. For the sake of other member's future knowledge I just thought I would revisit this sucker and "close the file" I left off with having my Dad try and get things taken care of while I was at my last semester of college. He continued to try things, ohm out sensors and got nowhere. I had already basically given up on the truck and was about to start ripping it apart for parts but he decided he would take it to another mechanic and let him see what he could find. The guy was good. It took him about 5 hours to find the problem (which I was both happy and sad to hear - 5 hours of labor to find the issue didn't excite me). It ended up being the Ignition control module. One of those freak things that goes bad and costs you an arm and a leg to get a new one cause they usually DON'T go bad. Mine was fried. It had heated up so much that the contacts were not in their correct places any more, thus SOMETIMES making the connections and SOMETIMES open. He popped the new one in and the truck immediately started up and ran great. So thats what it was. Simple fix for spending over half a year testing systems and diagnosing things while I was home from college. I'm now regularly driving the truck from Wisconsin to Michigan and since I've given it a bit of a tune up and some new injectors I'm easily pulling a baseline 20 mpg highway with it on NON-Ethanol gas. Case Closed. :driving: Link to comment Share on other sites More sharing options...
Pete M Posted December 8, 2009 Share Posted December 8, 2009 5 hrs is a small price to pay to get your baby back. :clapping: Link to comment Share on other sites More sharing options...
MiNi Beast Posted December 8, 2009 Share Posted December 8, 2009 I could of told you that, why I have an extra icm on the self. :yes: Link to comment Share on other sites More sharing options...
500 MJ Posted December 8, 2009 Author Share Posted December 8, 2009 I love you too Roger... :fool: Link to comment Share on other sites More sharing options...
MiNi Beast Posted December 8, 2009 Share Posted December 8, 2009 :agree: Link to comment Share on other sites More sharing options...
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