1990 FORD F-150 ROUGH IDLE

  • Tiny
  • reykuz
  • 1990 Ford F-150
  • 5.0L
  • V8
  • 2WD
  • automatic
  • 263,811 miles

Rough idling no power. Mild black smoke. I set the timing at 10° btdc. The following parts been changed. MAF, IAC, TPS. All the wirings from sensors to pcm been checked and found ok. All fuses are ok. Intake manifold gasket is new. Fuel pressure is 50 psi fuel filter is new. I tried to removed and put it back the maf sensor wire but the engine idling the same. It seems that the maf sensor is not functioning. Snap acceleration it backfire

Sunday, February 9th, 2014 AT 10:13 PM

1 Answer

  • Tiny
  • hmac300
  • Expert
  • 42,965 posts

Fuell pressure shold be 30-45 psi check the fuel pressure regulator may be bad and scan for codes. Fue l can be checked key on engine off.

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Monday, February 10th, 2014 AT 7:04 AM

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