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 1999 exepadition it has an intermitting problem. In the past year it has started to idle after it is hot around the 400 rpm range. When it is cold it will just die. The problem just starts and stops at random I might go two weeks or it might be just a day. When it is running correctly it maintaines the 700 rpm. I have not had to do anything other then oil and filter changes. I took it to the local parts store they hooked up a dianostic conputer to it and it had no troble codes. Can you give me some direction I'am very mechanical inclined, I just need direction to start looking.
Answer There are two common problems on Expeditions that can cause this symptom. One is a leak in the pcv hose, usually at the rubber elbow at the intake manifold, this is more common on the 5.4L but you didn't say which engine you have. The other is the idle air control valve, which can stick and not control idle speed. With the absence of codes I would suspect one of these is your problem.
