1990 Ford Mustang backfire

1990 FORD MUSTANG
215,000 MILES • V8 • 2WD • MANUAL
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JMIEYBOY
  • MEMBER
  • 5 POSTS
get a backfire or popping sound with power loss when shifting to a higher gear and accelerating.

changed plugs, rotor and cap 6 months ago
Jul 6, 2010 at 3:40 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Possibilities: Inspect and test all the following listed below:

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
False air leakage.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard
Jul 6, 2010 at 3:43 AM
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JMIEYBOY
  • MEMBER
  • 5 POSTS
does air intake play a role?
Jul 6, 2010 at 5:01 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Yes it does air leaking past the MAF is unmeasured it will cause to run too lean. lean or rich will cause a backfire. Check the fuel pressure
Jul 6, 2010 at 5:05 AM
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JMIEYBOY
  • MEMBER
  • 5 POSTS
thank you very much !!
Jul 6, 2010 at 5:15 AM
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