AboutDennis 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 32 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)
www.blueovaltechs.com
IAMAW (retired)
National Street Rod Association
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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
Question I have a 1993 E 150 ford van with 351 engine aprox 99,000 miles on it It has a slight miss at idle, Things that have been done so far There is no check engine light. When van was put on scope there was some peaking . Spark plug wires were changed and that solved the peaking. Plugs,rotor.cap,pvc,air filters, fuel filter,were. no vacum leaks, checked resistance at injectors also checked for bad diodes in alternater, Checked for bad grounds also checked compression and harmonic bal.maybe you can shed some lighton this
Answer A slight miss at idle? Is it a definite miss, or rough idle? The 5.8 had problems in the throttle body gasket and the plenum gasket leaking.
You might have to go as far as pulling valve covers to make sure all the valves are operating as designed. A worn cam or stuck lifter, anything that affects valve timing or opening duration. Have you put a vacuum gauge on it? Many times this can tell you more than a compression test.
