Intermittent high idle
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New User
Joined: Jan 2006
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From: Kelowna, BC
Intermittent high idle
Hi. I have a 1992 Ford F150 4x4 5spd. It has 166,000 kms and I just got a tuneup. New plugs/fuel filter. And also got a new catalytic convertor n muffler/exhaust system because it didn't have one before. Sometimes the truck idles really high. Like 3-4000 RPM, while sometimes it idles normally. While I step on the clutch to shift you can hear it revving or if i put it into neutral it will be revving loudly. If I'm in a parking lot I have to touch the brake only as it moves by itself. Any ideas what could be the problem? It is intermittent and only does it some times. Thx.
Post Fiend
Joined: Mar 2002
Posts: 19,402
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From: Bonita Springs FL
Because of the intermittent nature, I would think it's not a vacuum leak. I would start by taking off the throttle body and cleaning it out really good with throttle body cleaner and a stiff brush. It could be sticking open sometimes.
I would also pull the codes to see if the computer can see something wrong.
http://www.midimonkey.com/~frederic/f350/eec-codes.html
I would also pull the codes to see if the computer can see something wrong.
http://www.midimonkey.com/~frederic/f350/eec-codes.html
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New User
Joined: Jan 2006
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From: Kelowna, BC
I just checked the codes with a Ford code reader and it gave me code 11 which means "the system is ok". Would a dirty throttle body or a vaccum leak come up as a code on the code reader? Thx.
Theres on unplugged/broken hose under the hood. I'm not sure what it is/what is goes to. I'll attach a picture if you can help identify if this could be the problem.
Theres on unplugged/broken hose under the hood. I'm not sure what it is/what is goes to. I'll attach a picture if you can help identify if this could be the problem.
Originally Posted by andym
Because of the intermittent nature, I would think it's not a vacuum leak. I would start by taking off the throttle body and cleaning it out really good with throttle body cleaner and a stiff brush. It could be sticking open sometimes.
I would also pull the codes to see if the computer can see something wrong.
http://www.midimonkey.com/~frederic/f350/eec-codes.html
I would also pull the codes to see if the computer can see something wrong.
http://www.midimonkey.com/~frederic/f350/eec-codes.html
Last edited by airpak; Jan 21, 2006 at 04:09 PM.
Posting Guru
Joined: Sep 2002
Posts: 2,420
Likes: 3
From: Langhorne, PA
That hose may go straight down. I believe it is one of two hoses that go into, and out of a charcoal cannister, that cannister should be just behind the radiator and below the battery( or passenger side/front of engine)
You want that hose connected, you have a vacuum leak.
Your vacuum reserve, the black coffee can looks rusted as well.
There may be pin-hole leaks in the vacuum reservoir, it has to be air-tight to hold vacuum. Be very careful with all vacuum hoses, they are plastic and break like dry pasta.
Search Seafoam on this site. You may want to seafoam the intake manifold, upper and lower plenums, before you take them apart, they are difficult to get in and out, and hard to clean even if out of the engine.
Stick with this site, this is the best place you will ever visit...if you want to keep that truck running well.
You want that hose connected, you have a vacuum leak.
Your vacuum reserve, the black coffee can looks rusted as well.
There may be pin-hole leaks in the vacuum reservoir, it has to be air-tight to hold vacuum. Be very careful with all vacuum hoses, they are plastic and break like dry pasta.
Search Seafoam on this site. You may want to seafoam the intake manifold, upper and lower plenums, before you take them apart, they are difficult to get in and out, and hard to clean even if out of the engine.
Stick with this site, this is the best place you will ever visit...if you want to keep that truck running well.
Senior User
Joined: Dec 2005
Posts: 206
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From: Piney Point Shores, Md
Looks like a PCV hose, I had one crack about the same place I took a piece of heater hose to couple it back together and it worked fine, that tube is very brittle though, It should connect to the air filter from a valve cover or other port through the actual crankcase valve. It could effect the idle, always fix the obviuous and the easiest first.
Good luck
Good luck
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