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1988 Ford F-150 passing smog

Tiny
RICHARD NORIEGA
  • MEMBER
  • 1988 FORD F-150
  • 6 CYL
  • 2WD
  • MANUAL
  • 135,000 MILES
No matter what gas I put in my truck it seems to be running rich, bad smell coming from the exhaust. The exhaust manifolds are cracked also is this a problem with this vehicle?
Friday, December 5th, 2008 AT 8:35 AM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Possible causes include a bad O2 sensor, excessive fuel pressure (bad fuel pressure regulator or plugged return line), leaky fuel injectors, dirty air filter or restricted air inlet, or a defective coolant sensor that prevents the engine management system from going into closed loop mode. Exhaust manifold leaking will make the oxygen sensor read lean and computer will throw fuel at it.
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Friday, December 5th, 2008 AT 8:47 AM

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