1995 Dodge Ram BACK FIRES

1995 DODGE RAM
168,000 MILES • V8 • 4WD • AUTOMATIC
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CURBBIE
  • MEMBER
  • 1 POST
MY DODGE WILL BACK FIRE AND MISS WHILE DRIVING I HAVE REPLACED THE IDLE AIR CONTROL VALVE, EGR VALVE, AND THE MAP SENSER. I THINK IT MITE BE A FUEL PUMP BUT NOT SURE MY QUESTION IS WHERE DO I TEST IT ON MY DODGE TRUCK AND DO YOU HAVE ANY OTHER SUGESTIONS ON WHAT ELSE WOULD BE WRONG WITH IT THANK YOU FOR NUR TIME

SCOTT
Dec 5, 2009 at 9:02 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Hi curbbie and TY for the donation

1995 Dodge Ram BACK FIRES could be lean misfire or ignition -check and test below

Oxygen sensor
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
Dec 5, 2009 at 9:46 AM
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