Cold fuel enrichment
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Mountain Pass
Joined: Nov 2004
Posts: 241
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From: Dayton Ohio
Cold fuel enrichment
What controlls the fuel enrichment when cold on a 92 F150 with a 302,I have been having a problem with my truck when the motor is cold but runs fine when up to operating temp,I changed the coolant sensor and no improvement so I am thinking whatever controlls the cold fuel enrichment might be the problem. Jeff
Tuned
Joined: Feb 2003
Posts: 495
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From: Cincinnati, Ohio
What problem(s) are you having when the engine is cold? The injectors are profiled by the computer based on inputs from the coolant temperature sensor and intake air temperature if your engine has the air charge temperature sensor in the intake manifold. Are you getting any codes?
John
John
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Mountain Pass
Joined: Nov 2004
Posts: 241
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From: Dayton Ohio
It has a little bog off idle when cold and the high idle surges a little,the check engine light has not come on so I dont think it has set any codes and the throttle response is not as good as when the motor is warmed up. I now think I read somewhere that when the motor is cold the computer sends the air from the smog pump to the heads to fool the oxygen sensor that its lean so it richens the fuel while being cold so could the divertor valve be bad or the solinoid the controlls the vacumn be bad. Jeff
Lead Driver
Joined: Nov 2002
Posts: 9,557
Likes: 44
From: Concord, NC
when the motor is cold the computer sends the air from the smog pump to the heads to fool the oxygen sensor that its lean so it richens the fuel while being cold
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