1990 Ford Mustang GT Fox Body 5.0

Asked by Shanep1976 Oct 21, 2018 at 01:24 AM about the 1990 Ford Mustang GT Hatchback RWD

Question type: Maintenance & Repair

Hello All,
I have a 1990 mustang gt with. 5.0 302. I just
changed the TFI module and still having the
same issue. Motor cranks but will not fire
when hot. I have good spark and fuel coming
out of the shredder valve. I did not measure
the pressure. I also sprayed stating fluid the
the air cleaner and still not start. When the
motor cools down the motor will start just
fine and drive without issue. Sometimes I
have to floor the throttle and it might start.
The spark plugs seem a bit dry as well. What
are your thought.

4 Answers
10

Jim answered 6 years ago

Sounds to me like low fuel pressure...test for proper fuel pressure if not within specs then replace fuel pump.....

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Shanep1976 answered 6 years ago

I’ve cleaned the contacts in the distributor and seem to be in great condition. I will check to see what my fuel pressure is at. Should the spec be 40psi?

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Shanep1976 answered 6 years ago

Also my son fired it up this morning like nothing was wrong. This is driving me nuts, not too sure if it’s the coil, fuel, compression or a sensor.

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10

GuruLCNPL answered 5 years ago

Hands down COIL. Not a fuel pump. They don't work then not work. When a coil gets hot they break down internally by resistance. Replace the coil. It will be all good!

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