IDLES ROUGH AT 4000 RPM'S

1988 Ford Bronco

Tiny

crooks4

July, 16, 2010 AT 2:02 PM

Engine Mechanical problem
1988 Ford Bronco 6 cyl Four Wheel Drive Automatic

I have a 1988 ford Bronco II 2.9 Fuel Injected.
It runs good until you hit between 3-4000 rpm's. Then it acts like it's not getting enough gas. I have replaced the fuel pump and the filter. Thanks for any advice you have. We are trying to fix this for our daughter to drive.

FOUND 4553 RELATED QUESTIONS

Running Rough

27 ANSWERS
34 IMAGES

Idles Rough/changed Ects

37 ANSWERS
3 IMAGES

1 Answer

Tiny

rasmataz

July, 16, 2010 AT 4:16 PM

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
Knock 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 it.

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