happyjeep Posted January 30, 2015 Share Posted January 30, 2015 Hi there. I own a 1986 Jeep Comanche Custom 4x2 pickup with a 2.5 Throttle Body Injection or Fuel Injection. Last week Friday, I was heading home from the truck stop, where I parked my semi truck for some home time. At first my truck was running great, filled up the tank with unleaded gas, packed up my belongings on it and drove home. While I was heading home on the freeway, the engine gave up, so I shift to neutral, started up again and it ran for a split second. I decided to safely pull off the side of the road and get help from AAA. I was towed to a shop, where a tech there has moderate knowledge and experiences on AMC Jeeps. He found out that there was a faulty fuel pump, so that was replaced. He ran it for 10 mins and it seemed great, until he was ready to drive off from the bay. It stalled, he tried to start it, but no improvements thereafter. He checked the fuel pump relays and they're good, did a spark test and it showed spark from the plugs and wires and the ECM is good. He took apart the TBI and cleaned it, but he didn't looked into the injector and checked if the injector jet worked. He's about this close of giving up, but I advised him don't. I'm thinking of 2 things: One the computer may be bad or two, the injector gave up. Other than that I don't know what else can be the cause of that stall on the Last Friday's drive on the freeway. Thank you very much for hearing me out. Link to comment Share on other sites More sharing options...
Jeep Driver Posted January 30, 2015 Share Posted January 30, 2015 Don't check the fuel pump relay, replace it. If that is not it, replace the CPS. If that is not it, may be the MAP. Link to comment Share on other sites More sharing options...
happyjeep Posted January 30, 2015 Author Share Posted January 30, 2015 Hi there. I'm glad to see some response coming in. I forgot to mention that not I'm only sending the main topic to all Comanche Members, but for those who are experienced Auto Mechanics as well. Again, it's at the shop and the CPS or Crank Position Sensor had been checked and replaced, as well as the Fuel Pump relay. The cap and rotor have both been replaced. The mechanics there are running out of remedies, so please be a good samaritan ya'all. Thank you all for helping me out. Link to comment Share on other sites More sharing options...
HOrnbrod Posted January 30, 2015 Share Posted January 30, 2015 Fuel filter. Link to comment Share on other sites More sharing options...
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