2000 Ford E-250 Q&A
2000 Ford E-250 Question: No power under Load, Engine has a lean missfire! Does anyone have suggestions?
I have checked fuel pressure and performed a fuel volume test. I disconnected all 3 catalytics and drove, same problem. When I cycle the ignition while running the engine accelerates fine 2 times, then it goes back to having a lean misfire. I sprayed Throttle body cleaner down intake hose while the engine was bogging and it accelerated up in RPM's. I cleaned the Mass Air flow sensor. The only code I have is for the EPC sensor (P1747). I checked for vacuum leaks. The problem is with all the cylinders. Remember it accelerates perfect when ignition is cycled while engine running. Please let me know if you have any suggestions. Thanks Mike - MikeDO
have you ck'd fuel pressure under load. install a f/p gauge and drive down the road and see if you are loosing fp - globalhelper
sounds like a vacuum leak...the ecu remains in open loop when you cycle the key and once it reaches closed loop, it lets the MAF take over...but the MAF does not pick up the vacuum leak. - your.mechanic
Do you have a vacuum guage? Hooked up and read correctly , that can give some useful info , that a scanner won't. - ziptie12