Idle problems.
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Joined: Oct 2014
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Idle problems.
Ok here we go. I have a 1988 Ford F-150 4.9 2wd. When I bought the truck I noticed when I started it the engine would idle fine for a few minutes the it would hunt for a few minutes then idle normal with no problems until I started it cold again. I replaced the idle air control valve and replaced some vacuum lines that looked cracked. So now when I start it up it will idle at 2000 rpms for about 30 seconds the slowly drop till it reaches about 500 rpms then it will start hunting again and after a couple minutes it will start to idle normal. I have tested the TPS and with the throttle open it reads 4.36 volts. Help I am running out of options. Oh and I get a code 12 if I remember correctly.
Logistics Pro
Joined: Jul 2009
Posts: 3,635
Likes: 3
From: Lansdale, PA
Not sure if it's the issue, but my truck started doing the same thing when I unhooked the evap lines. An old mechanic told me it is expecting to be sucking vapors from the tank, and it's not getting the flammable vapors, so it doesn't idle as well. Not sure if it is true, but I haven't hooked the evap stuff back up to see if it helps either though.
Check it out I guess.
Check it out I guess.
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