1999 F-150 Idle problems
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From: Fairhill, MD
1999 F-150 Idle problems
I have a 1999 F150, 4.2L with 157,000 miles. I have never had a problem withit until I tookit in for 150,000 service. They did the cruise control recall, changed serp. belt, tune up(plugs and wires), ball joints, fixed a ruptured vacuum line(service engine light on), tires and alignment. Left the dealership it was fine. The next morning while at a light turned on the heater and the truck idled high then shut off. Was able to drive it as long as the heater stayed off. Took it too them they changed the IAC. When I drove off it continued to do the same thing not as bad it would drop to about 400-500 rpms in gear with the heater on. I took it back and they then said it was low on freon for the compressor and that it was cycling too much. They charged the system and raised the idle. It now idles at about 850 in gear and 1000 in park. Never had this problem until they worked on it. Any suggestions on what to look for or how to fix it. The dealers response was " that is what I should expect to see out of a truck with that kind of miles on it".
Thanks
Chuck
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Chuck
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From: Ardmore
I would check for a vacuume leak somewhere around where they replaced the busted line, or somewhere around the blend door on the climate control system. It sounds like when you turn the heater on it creates a vacuume leak that allows more air into the engine causing the idle problem.
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From: Fairhill, MD
Checked all the lines and everything appears to be fine. What should my tach reading be at idle in park and how much should it fluctuate whne the compressor kicks on and off. Right now it is at about 850-900 in park no heat or ac, when I turn the ac or heat on it jumps to about 1200 then drops back to 1000. Never noticed it doing this before. Maybe I'm just losing my mind...
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yamahar1rider9
1999 - 2003 7.3L Power Stroke Diesel
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Mar 10, 2006 08:55 AM
