zithy Posted June 17 Share Posted June 17 I have been chasing a problem for a while without success, and have some time over the next couple weeks to dig into it. After driving for 30is minutes I lose power on my 1986 2.5L. It is manual, and I can push the clutch and rev the engine without trouble, but any load lugs the engine. If I restart the engine I can get a minute of motion out of it, but the problem comes back quickly. I only take short trips with it now, and don't get on the expressway. I have checked the fuel line to see if I am getting vapor lock, but it doesn't run near enough to anything hot, and it happened during the Missour winter as well. I added a ground wire near the fuel pump a la Cruiser54 tips, but that didn't fix it. I got an REM from NickInTimeDesigns to help with diagnostics. The engine starts running lean and goes into open loop when the problem occurs. The O2 sensor seems to be giving reasonable readings. I was about out of gas once when it started, and after filling up if ran fine the rest of the way home, about 10 minutes away. Could the fuel pump be failing? I have repaired a lot of wiring under the dash as when I got it a couple years ago the e-brake had cut several wires and melted some stuff, so some sensor could be disconnected or connected to the wrong thing, or the ECU could be damaged. The reprieve I get after restarting makes me think it is ECU or sensor related. Anyone have experience with this or have suggestions? Link to comment Share on other sites More sharing options...
89 MJ Posted June 17 Share Posted June 17 I’m leaning towards fuel pump being on its way out. After restarting, it is giving the fuel pump a chance to prime the system again. Link to comment Share on other sites More sharing options...
eaglescout526 Posted June 17 Share Posted June 17 Yeah this sounds very familiar. Fuel pump comes to my mind as well since I went through this twice on my 84 XJ. Link to comment Share on other sites More sharing options...
zithy Posted June 17 Author Share Posted June 17 That would be simpler than an ECU, or chasing wiring. I will order one and report back. Link to comment Share on other sites More sharing options...
pizzaman09 Posted June 20 Share Posted June 20 I third the fuel pump, I've had a similar issue on another car that turned out to be a failing fuel pump. Link to comment Share on other sites More sharing options...
zithy Posted Tuesday at 11:15 PM Author Share Posted Tuesday at 11:15 PM I got the fuel pump in the mail today, so hopefully I will know by the weekend. Thanks! Link to comment Share on other sites More sharing options...
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