Mechanics

F150 STARTS THEN DIES

1994 Ford F-150 • 114,000 miles

The truck will start up fine runn for a couple of seconds then die. Replaced mass air flow sensor and it did not fix. If you unplug the maf the truck will run with no issue. Put 2 different mafs in it and the problem was not fixed. It is also a 5.0L
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Thunderracing07
July 2, 2012.



Have checked for codes? Fuel pressure?

Docfixit
Jul 2, 2012.
I have codes 111 system check ok and 556 for fuel pump relay power. Have not checked fuel pressure. It runs fine if the maf is unplugged. You plug the mass air flow in and it immediatly dies.
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Tiny
Thunderracing07
Jul 2, 2012.
With MAF pluged in air fuel ratio is regulated if fuel pressure low will cause stalling. MAF unpluged runs full rich

Docfixit
Jul 3, 2012.

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