• Tiny
  • 520hugh
  • 1995 Ford F-150

Engine Performance problem
1995 Ford F150 V8 Two Wheel Drive Automatic 150 miles

The 5l engine idles rough when warm but the big problem is backfire at mid speed with slight exceleration. That will light the check engine light. It will run at full throttle. I have installed platinum plugs, wires, cap & rotor and oxygin sensor. Also cleaned the mass air flow sensor and egr. Help

Do you
have the same problem?
Sunday, August 30th, 2009 AT 11:22 PM

1 Reply

  • Tiny
  • rasmataz
  • Member

Inspect and test the following:

Dirty fuel injectors (cleaning the injectors often fixes this).
Bad MAP (manifold absolute pressure) sensor
Bad TPS (throttle position) sensor
Bad or dirty MAF (mass airflow) sensor
Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
Bad gasoline (fuel contaminated with water or too much alcohol)

Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

Dirty or worn spark plugs
Bad plug wires
Weak ignition coil
Wet plug wires

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Sunday, August 30th, 2009 AT 11:31 PM

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