Will start but not run
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Joined: Dec 2004
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Will start but not run
I have a 1988 F250, 351Winsor. It ran fine when I parked it, but when I started it the next time, it started fine, but would quit immediately. I can keep it running if I "flutter" the accellerator and run it up to about 2000 rpm. It will not keep running if I hold the pedal steady while partially depressed, only if I flutter it. It seems to want to backfire through the throttle body.
I replaced the water pump about 30 thousand miles ago and while I had it off, I replaced the timing chain.
It has a new fuel filter, Throttle Position Sensor, high pressure fuel pump,battary and cables.
Fuel pressure, KOEO, is 38PSI which is perfect.
Is there a fuel system strategy which would explain this behavier? Any particular sensor or actuator? Or am I looking in the wrong area?
Any ideas?
Thanks,
Wade
I replaced the water pump about 30 thousand miles ago and while I had it off, I replaced the timing chain.
It has a new fuel filter, Throttle Position Sensor, high pressure fuel pump,battary and cables.
Fuel pressure, KOEO, is 38PSI which is perfect.
Is there a fuel system strategy which would explain this behavier? Any particular sensor or actuator? Or am I looking in the wrong area?
Any ideas?
Thanks,
Wade
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Joined: Dec 2004
Posts: 20
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From: Oregon
I would recommend checking the ECT. I take it the vehicle is EEC-IV and not modified. If the ECT is feeding false temp to the ECM (say -40 deg. F.) the PCM will dump fuel to the engine and flood it. Pids are only accessable on some older Ford systems, using a scan tool. The sensor will be in the intake or T-stat housing(some applications are in a block water jacket,but not on this engine), and has 2 wire lead, the single wire sender is the conventional guage or temp light. Hope this is some help. Reread your post and didn't see if this is EFI or feedback carburation, (this sensor is more critical to EFI )
Last edited by FmrFrdTech; Dec 27, 2004 at 03:01 AM.
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yes, it's an EEC-IV. I'm going to check out the pick up in the distributor first. It doesn't seem to me like it is flooding and the back fire would indicate an ignition timing or something to that effect. (I think)
Thanks, I'll let you know if this helps.
Wade
Thanks, I'll let you know if this helps.
Wade
