Idle Problem
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New User
Joined: Mar 2004
Posts: 2
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From: Colorado
Idle Problem
Just bought a 1993 F150 (302) last month and finished rebuilding the engine this weekend. Feels like new now, but there is an idle problem when using the heating/cooling system. The engine idles smooth at about 850, but when I turn on the normal A/C, Max A/C, Defrost or Mix the engine alternates quickly between 500 - 850 rpms. It does not happen when I turn on the vent or floor blower. Tested the battery and alternator w/ a multimeter and both are working fine. I also am getting an engine code for a bad oxygen sensor, but I don't think it is related. I replaced the sensor and tested the whole EGR system and no problem. Kinda stumped right now and just need a few ideas on what to check to fix the idle problem. Thanks
Thread Starter
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New User
Joined: Mar 2004
Posts: 2
Likes: 0
From: Colorado
doccamel, thanks for the advice. That would of been one of the last things I checked, after spending my paycheck at auto zone to try and fix it. I pulled it off this afternoon and cleaned it out and works like magic (for now). 
