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Feathering Throttle keeps it running

 
  #1  
Old 10-17-2009, 03:40 PM
mrb455
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Unhappy Feathering Throttle keeps it running

89 F250 460, this will test your knowledge. I can start the engine and it will run only while feathering the throttle, if you don't it will slowly die but starts right back up with no black smoke or smell. It will not idle on its own and will not stay running long enough to check for vac leaks although I did a visual check and all appeared ok. This is a conversion engine so I don't know how to read codes w/no light. I replaced the O2 sensor, EEC, and the Coil , there is no Cat because the truck is an 1986 but the motor is an 1989. The TPS seems to check out w/ no spikes while testing.

I am a little stuck at this point and need help
 
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Old 10-17-2009, 04:37 PM
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Does it stay like this or does it settle out when its warm? Do you have a MAP sensor? If so, unplug it (vacuum line) and see if there is a change.
 
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Old 10-17-2009, 04:45 PM
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It never runs long enough to get warm, only a few seconds at a time unless I am playing with the throttle. I put a new MAP sensor on it, no change.
 
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Old 10-17-2009, 04:53 PM
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Carb or FI? Throttle plate clean? Idle Air Control Valve? Do you know if you keep getting fuel? (probably cause if you throttle it youre ok)

Just trying to pick up some info here..
 
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Old 10-17-2009, 05:20 PM
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FI Throttle plate clean, IAC working and clean, all pumps working @45lbs. Would the EGR have anything to do with this?
 
  #6  
Old 10-17-2009, 08:34 PM
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No, mine is bad also and its still running. Just hurts mileage (that im aware of). Its an expensive little bugger.

Sorry man, im out of ideas without looking and tinkering. Just double check that vacuum lines are good and closed (not broken) and that wires look ok also. Hopefully somebody else with a lot more knowledge will see this tonight and by morning you may have something.

Good luck. Sorry I couldnt help out more.
 
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Old 10-17-2009, 08:45 PM
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Thanks for your input.
 
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Old 10-17-2009, 08:49 PM
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Since the trucks has been upgraded to EFI I have to ask about what you're using for a fuel pump. If it's whatever was in it for the carbed motor then that's your problem.. it's not building enough fuel pressure, EFI needs a steady 40psi at the rail.
 
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Old 10-17-2009, 09:21 PM
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I have one in each tank and a high pressure pump outside.
 
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Old 10-17-2009, 10:14 PM
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Still need to check fuel pressure I think.. it could be low. Is there an EEC test plug on the wiring harness, if so get a code reader for it.
 
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Old 10-17-2009, 10:19 PM
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Yes, there is a EEC test plug. Can the code reader be purchased or rented from an Auto parts store?
I am getting another fuel pressure tester tomorrow.
 
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Old 10-17-2009, 10:22 PM
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Code readers for these trucks are cheap($20-30) from online vendors and not terribly expensive retail, also sometimes available for rent/loan but you'll have to check locally.
 
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Old 10-17-2009, 10:23 PM
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Thanks, I will check it out tomorrow and get back with the results.
 
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Old 10-17-2009, 10:27 PM
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This one with the digital readout takes all the guess work out of it.

Equus Innova EPI 3145 OBD-1 Ford Scan Tool Code Reader at Gadgets Galore!
 
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Old 10-17-2009, 10:44 PM
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Thanks, I just checked online at a local Parts Store and found that same one for a couple of dollars more.
 
 
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