Truck running rich
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Truck running rich
My 1991 F150 with a 351W is running real rich. I stand behind the truck and I can smell the fuel big time. Just replaced the injectors because the truck was parked for about 2 years. Took the spark plugs out and some plugs were white some were dark and some were half and half. Any ideas?
Last edited by tuekwik; Apr 1, 2006 at 10:40 AM.
Hotshot
Joined: May 2004
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From: The hills of No. Calif.
Check your fuel pressure regulator. Pull the small vacuum hose from the center and see if it has gas in it (it shouldn't.) If it does, then it's got a ruptured diaphragm. Also, check the pressure at the Schraeder valve (should be around 35-45 psi at idle.)
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Postmaster
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From: Pleasant Hill, MO
I had this happen once. Rotten HEGO sensor didn't spit a code, because it was coated in carbon. So, it wasn't testing the air on the way out, ran it rich, and the same thing was happening.
Ryan
Ryan
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Postmaster
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From: Pleasant Hill, MO
check your sensor before you go pay $40 for one. It's located in the exhuast pipe before they are joined into one pipe. There's a small connecting pipe between them, and the HEGO sensor is screwed into that piece.
Ryan
Ryan
Mountain Pass
Joined: Aug 2005
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From: Seattle
Check the timing, and maybe even try to advance it a bit. If the timing is retarded to much, the spark will ignite too late and not have enough time to fully burn the fuel. This will give you a rich running engine that has no power and will definately be sluggish.
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