My 5.0L 1990 LX starts fine when cold but will only start when warm when I put throttle to the floor. I have replaced O2 sensors, adjusted the TPS to be .98V dead-on, and cleaned the idle air control. Any other ideas from anyone?
I just bought a 91 GT. The guy I bought it from said it would only start when cold. When the engine was warm it wouldn't crank and if you held the ignition turned to crank it the negative battery cable got really hot. He said it was the starter and gave me a spare to put in.
Well, I looked at the negative battery cable & terminal and they were a corroded mess. I cut the cable to get to fresh wire, wire brushed the terminal and it cured the problem 100%. Not sure if yours is cranking when warm or a different problem, but thought this might help.
Your problem is a leaking injector when the car is shut-off., that is why you need to hold the throttle to the floor to shut off any additional fuel since the engine is flooded. Your problem has nothing to do with a starter.
Thank you everyone for the replies already. I should have added that almost everything is new on this engine. This includes a new mini-Ford Racing starter, new battery cables, new ACCEL 30# injectors, new ACCEL billetech districburor and super coil, new garranelli MAF, etc. etc.
As far as a "leaking injector"...how can I test that?
The easy way is with a Fuel Pressure gauge. Start the car shut off and watch how fast the gauge drops. The other way is also easier, run the car warm shut off the car hold the throttle down pull the coil wire crank for a couple of turns and now pull the plugs. Look for the wet plug. You probably won't have any codes unless the MAF is bad which is causing the flooding issue.
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