Does anyone know if there is a switch or sensor that acts as a choke on a 96 ford 351? My bronco is hard to start when cold, starts okay after warmed up. Could this problem be the fuel pump not putting out enough pressure when starting?
That is the sympton exactly it seems to crank to long then it will fire and die. Then on the second try it will start but seems to run cold (like it has a carb with out a choke) but once it is warmed up it runs fine.
My mistake...a bad EGR valve does not cause those symptoms, I was thinking of something else (bad choke pull-off on a carb). But something may be causing your truck to run rich upon startup, wetting the plugs and causing it to run bad until it gets warm enough to dry the plugs. That is what a bad choke pull-off will do, although you do not have a choke, the symptoms are the same.
I am having the exact same problem. After starting it wants to idle at 400 to 500 RPMs instead of the usual 900 to 1200 when cold. After warming up it is fine. A plug, distributor cap, and plug wire change did not help. Seems electronic to me. Help us out one of you tech wrenches.
[updated:LAST EDITED ON 15-Sep-02 AT 11:53 PM (EST)]I also changed plugs, wires, cap, rotor and I put in a new coil. Still have the same problem. I hope someone has a idea.It seems like i am not getting enough fuel pressure at start up but it does sometimes smell like it is running rich. Any help please.
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