frankMart Posted July 22, 2013 Share Posted July 22, 2013 Recently I made some changes to my Manche, first I changed the ECU to a newer one, changed O2 sensor, and changed fuel tank, fuel sender and fuel pump, I took them from a 89 Comanche that was parked since one year. I think the fuel pump was stuck 'cause it didn't throw fuel until someone sucked at the tube. After all these updates when I brake hard, in a emergency or at a stop, the Jeep just dies after a take my foot off the pedal, sometimes it runs for a second or two and then dies. I have to crank it two or three times before it starts again. Can someone tell me what things should I check to solve this problem? Link to comment Share on other sites More sharing options...
1989 Eliminator Posted July 22, 2013 Share Posted July 22, 2013 To me this sounds like a major vacuum leak somewhere. Is this ECU brand new or used? The pins inside could be loose and when you brake they disconnect. Try and drive your truck down a road and lightly tap your ECU. If it sputters or wants to stale then it is your ECU. Link to comment Share on other sites More sharing options...
frankMart Posted July 22, 2013 Author Share Posted July 22, 2013 Thanks! I will test it, the ECU is used, everything in it seems to be ok. But the dying problem came after I changed the fuel tank, sender and pump. Link to comment Share on other sites More sharing options...
1989 Eliminator Posted July 23, 2013 Share Posted July 23, 2013 keep us posted on the status of your problem! Link to comment Share on other sites More sharing options...
rocketwheels Posted July 24, 2013 Share Posted July 24, 2013 Could be a bad ecu connector contact, but......I'm with Comanche fan on the vacuum leak.Seen this many times an many makes of cars. check the hose from intake to booster, elbow/checkvalve at the booster and maybe even the booster itself. It may just be a coincidence that it happened while you were doing something else. To me this sounds like a major vacuum leak somewhere. Is this ECU brand new or used? The pins inside could be loose and when you brake they disconnect. Try and drive your truck down a road and lightly tap your ECU. If it sputters or wants to stale then it is your ECU. Link to comment Share on other sites More sharing options...
1989 Eliminator Posted July 25, 2013 Share Posted July 25, 2013 If your booster diaphragm on the inside is bad and has a hole, this will cause a huge vacuum leak. So that is quite possible. Link to comment Share on other sites More sharing options...
cruiser54 Posted July 27, 2013 Share Posted July 27, 2013 Have you ever cleaned the throttle body and IAC? Made sure your intake manifold bolts are tight? Link to comment Share on other sites More sharing options...
frankMart Posted July 27, 2013 Author Share Posted July 27, 2013 Well, I took out the fuel sender and pump, found that the inside pump's wire had become loose, put a little solder in it, no more dying while braking hard since! Also, cleaned every connector at the engine bay and ECU, ground refresh and cleaned the throttle body. Now it runs smooth and gained a little more power. Thank you all for the help!! :thumbsup: Link to comment Share on other sites More sharing options...
cruiser54 Posted July 27, 2013 Share Posted July 27, 2013 I had the "wire" issue on my wife's XJ, only right after filling the tank and the gas would slosh against the loose fitting wire. Link to comment Share on other sites More sharing options...
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