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1990 Ford Mustang backfire

Tiny
JMIEYBOY
  • MEMBER
  • 1990 FORD MUSTANG
  • V8
  • 2WD
  • MANUAL
  • 215,000 MILES
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
Tuesday, July 6th, 2010 AT 10:40 AM

4 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 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
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Tuesday, July 6th, 2010 AT 10:43 AM
Tiny
JMIEYBOY
  • MEMBER
  • 5 POSTS
Does air intake play a role?
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Tuesday, July 6th, 2010 AT 12:01 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 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
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Tuesday, July 6th, 2010 AT 12:05 PM
Tiny
JMIEYBOY
  • MEMBER
  • 5 POSTS
Thank you very much !
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Tuesday, July 6th, 2010 AT 12:15 PM

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