idle problems
Thread Starter
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New User
Joined: Dec 2006
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idle problems
i have a 94 ford f150 with a 4.9l inline six and when i start it, it idles at about 3000rpm and i have replaced the gaskets on the intake but i still have the same problem, any help would be much appreciated
Thread Starter
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New User
Joined: Dec 2006
Posts: 3
Likes: 0
it doesnt slow down after warm up and its causing it to burn oil since it starts at such a hig speen and there are no vacum leaks but i did hear about the TPS or even the O2 sensor ill try them and get back to you
Fleet Mechanic
Joined: Mar 2005
Posts: 1,603
Likes: 1
From: St Louis
To save yourself some expense, pull the code first!!!
Then very carefully check every vacuum line running any where in the engine bay. Replace any faulty or suspected of being fualty hoses. Hard hoses should be replaced because they can crack and leak as well. If you do not have a multi meter, obtain one. Then go to fordfuelinjection.com and start testing all your sensors per their suggested method. Replace out of range sensors as necessary. If it is still running fast, clean the throttle body and the idle motor to make sure that it is not holding open. Also, use a hand vacuum pump to check your vacuum switches, and the canister purge valve. A small amount of leaking is factory excepted, large amouts, i.e. fast vaccum drops, is not acceptable. Still High idle? shoot it.
Then very carefully check every vacuum line running any where in the engine bay. Replace any faulty or suspected of being fualty hoses. Hard hoses should be replaced because they can crack and leak as well. If you do not have a multi meter, obtain one. Then go to fordfuelinjection.com and start testing all your sensors per their suggested method. Replace out of range sensors as necessary. If it is still running fast, clean the throttle body and the idle motor to make sure that it is not holding open. Also, use a hand vacuum pump to check your vacuum switches, and the canister purge valve. A small amount of leaking is factory excepted, large amouts, i.e. fast vaccum drops, is not acceptable. Still High idle? shoot it.
