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Car runs rough

Tiny
JORTIZ9758
  • MEMBER
  • FORD MUSTANG
I have a 1993 ford mustang gt. I was running low on gas one day and right before I got to the gas station my car was hesistaing and kinda backfiring. I thought it was because I was low on gas. I put gas in it. And no help. I have since changed the fuel filter and in tank fuel pump. And still nothing. I have a fuel pressure guage on the car and it reads 20 psi. My car should run at about 42 psi (supercharged).

Now the thing is if I disconnect the mass air meter the car runs fine.( I have changed that out also). But still only runs on 20 psi.

Could it be my adj. Fuel pressure regulator?
I cannot increase fuel pressure.
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Sunday, December 31st, 2006 AT 12:52 AM

3 Replies

Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
When you unplug the MAF, the fuel pressure comes up to spec?
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Monday, January 1st, 2007 AT 9:39 PM
Tiny
JORTIZ9758
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  • 2 POSTS
No it does not.
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Tuesday, January 2nd, 2007 AT 1:23 AM
Tiny
SERVICE WRITER
  • MECHANIC
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If the pump is not within specs, it won't run right. Sounds like a new pump is in order.
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Tuesday, January 2nd, 2007 AT 5:43 AM

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