1993 Ford Mustang Backfires when cold

Tiny
BRIAN JENTSCH
  • MEMBER
  • 1993 FORD MUSTANG
  • V8
  • 2WD
  • MANUAL
  • 250,000 MILES
When I fire up the car and take off after warm up, the thing bogs. I floor the gas and it will sputter and do a weird backfire/thump from the front right section of the engine compartment. After that initial backfire, it will run perfectly until I turn it off. Even if I only turn it off to get gas, when I restart, the same thing happens. I am thinking maybe the smog pump?
It has all new temp sensors, oxygen sensors, air filter etc. HELP!
Tuesday, November 18th, 2008 AT 10:46 AM

1 Reply

Tiny
JAMES W.
  • MECHANIC
  • 2,394 POSTS
The "thumping" noise you are hearing is more commonly know as "lean cough", caused by a fuel lean condition on start up. You may want to check fuel pressure at the fuel rail. Possible fuel regulator problem. Also, fuel filter wasn, t mentioned on your posting.
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Tuesday, November 18th, 2008 AT 12:34 PM

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