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F-150 Starts then dies

Tiny
THUNDERRACING07
  • MEMBER
  • 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
Monday, July 2nd, 2012 AT 6:36 PM

3 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Have checked for codes? Fuel pressure?
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Monday, July 2nd, 2012 AT 7:38 PM
Tiny
THUNDERRACING07
  • MEMBER
  • 1 POST
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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Monday, July 2nd, 2012 AT 8:56 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
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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Tuesday, July 3rd, 2012 AT 3:06 PM

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