F150 STARTS THEN DIES

1994 Ford F-150

Tiny

thunderracing07

July, 2, 2012 AT 6:36 PM

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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3 Answers

Tiny

Docfixit

July, 2, 2012 AT 7:38 PM

Have checked for codes? Fuel pressure?

Tiny

thunderracing07

July, 2, 2012 AT 8:56 PM

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.

Tiny

Docfixit

July, 3, 2012 AT 3:06 PM

With MAF pluged in air fuel ratio is regulated if fuel pressure low will cause stalling. MAF unpluged runs full rich

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