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Expert: Dennis W - 10/28/2007


Question
'94 Tempo, 125K mi., std trans.,fuel inj.
Sometimes the engine will start right off, at other times it may turn over and over for 5-7 seconds before it struggles to run smooth. Fuel pressure is 47psi. Vacuum applied to EGR causes the engine to falter, no codes in EEC.
Any hints, Dennis?


Answer
Fuel pressure you indicate is a little bit high. Does it hold or drop off rapidly with the key off? Most will hold a long time without losing pressure. If it drops quickly, check for leaks, especially the fuel pressure regulator. Check the MAP sensor vacuum hose for blockage, there is a gel in the sensor that on some will leak into the hose. Clean the idle control valve and throttle body too.

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Volunteer

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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