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Ford Repair/Ford Ranger Engine

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Expert: Dennis W - 10/21/2007


Question
My Ford Ranger 4.oL automatic 36000 miles will not rev over 3200 RPM. Engine operates normally up to 3200 RPM then surges approx 100-200 RPM at 1-2 second cycles with a distinct rocking (out of balance), this quickens with increased accelerator pressure. The problem occurs with or without a load (revving in neutral)- there were no previous symptoms, the check engine light is not on. I have replaced the fuel filter. Thanks.

Answer
This is normal if you are revving the engine in park or neutral, the PCM has a rev limiter to prevent engine damage. If the symptom occurrs while driving you might have a problem with the maf sensor or fuel pressure. Check for codes BEFORE making or attempting any repairs.

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Dennis W

Expertise

I am a retired Ford master tech specializing in electrical, climate control, emissions, driveability, chassis, brakes, and any light repairs. Currently employed by an independent shop that appreciates my knowledge and abilities. Cannot answer transmission or parts questions, these are not areas of my expertise.

Experience

37 years of auto repair, diagnosis, and emissions testing, in service staions, independent garages, and 20 years with Ford dealers.

Organizations
National Street Rod Association (NSRA)
International Automotive Technicians Network (IATN)
IAMAW (retired)
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Education/Credentials
Riverside City College Automotive technology program
Ford Master Tech Certified Engine and Chassis Master (Over 500 hours)
ASE Certified in 7 categories
6 years training in Union 76 Pro-tech program

Awards and Honors
4-time Technician of the Year at Almaden Lincoln Mercury
Ford Master Tech
Union 76 Pro-tech Master tech

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