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1993 Ford F-150 Rough Idle

Tiny
MOONDOG641
  • MEMBER
  • 1993 FORD F-150
1993 Ford F150 V8 Four Wheel Drive Automatic

When the engine is warm, the truck will idle rough. Also with a warm engine and in park, when shifting into drive, engine will stall. It seems to be, that the engine is getting a rich mixture of fuel when it is getting warm, because you can smell the fuel and I am burning through alot of gas. I am thinking it may be a fuel pump or fuel relay problem. Any suggestions on how to tackle this issue.
Thanks
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Friday, January 8th, 2010 AT 7:28 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
On the rich side check and test the following:

Possibilities here: Possible causes include a bad O2 sensor, excessive fuel pressure (bad fuel pressure regulator or plugged return line), leaky fuel injectors, dirty air filter or restricted air inlet, or a defective coolant sensor that prevents the engine management system from going into closed loop mode.
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Friday, January 8th, 2010 AT 9:55 PM

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