Need help solving rough idle problem.....
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Joined: Jan 2001
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From: Virginia
Need help solving rough idle problem.....
The fuel pressure regulator is on the rear drivers side. It has a triangle looking mount with three bolts holding it on. It will also have a vacuum line coming out of it. To test it you should install a fuel pressure gauge. Follow the fuel system around and you should find a fitting that looks like a tire valve. This is where the gauge hooks to.
The egr is on the front pass side. It is mounted to the side of the throttle body and has a large pipe coming out of the bottom.
The egr is on the front pass side. It is mounted to the side of the throttle body and has a large pipe coming out of the bottom.
Elder User
Joined: Nov 2001
Posts: 892
Likes: 1
From: Duluth, MN
Need help solving rough idle problem.....
If it ain't broke.....change stuff till it is!
I have a 1986 f-150 4x4 w/ Lariat Pkg. When I start it in the morning, it runs and idles fine. But after driving just a short ways and allowing it to warm up, when I put it back into park, it idles rough (like around 200 rpm's), and wants to die. It also burns rich. Then when I put it back in gear it idles fine. Could this be the Park Idle Sensor? Or could it be the ignition module? I just started last month when it began to warm up in minnesota here. The 302 is efi, and I recently cleaned the throttle body and replaced the plugs. I don't really know what to make of this......any help would be greatly appreciated!! thanx!
I have a 1986 f-150 4x4 w/ Lariat Pkg. When I start it in the morning, it runs and idles fine. But after driving just a short ways and allowing it to warm up, when I put it back into park, it idles rough (like around 200 rpm's), and wants to die. It also burns rich. Then when I put it back in gear it idles fine. Could this be the Park Idle Sensor? Or could it be the ignition module? I just started last month when it began to warm up in minnesota here. The 302 is efi, and I recently cleaned the throttle body and replaced the plugs. I don't really know what to make of this......any help would be greatly appreciated!! thanx!
Elder User
Joined: Nov 2001
Posts: 892
Likes: 1
From: Duluth, MN
Need help solving rough idle problem.....
If it ain't broke.....change stuff till it is!
I pulled the IAC wire, and the engine didn't shut down like it was suppose to. It just bogged down like it does after I drive it, and after about 3 sec. came back up to regular idle. So I'm going to replace that. I also need to clean my EGR valve I think, but don't know where it is. Is it to the left of the throttle body? I have the 302 efi. Also, where is the fuel pressure regulator. I think the diaphram may be ruptured. thanx for any help!
I pulled the IAC wire, and the engine didn't shut down like it was suppose to. It just bogged down like it does after I drive it, and after about 3 sec. came back up to regular idle. So I'm going to replace that. I also need to clean my EGR valve I think, but don't know where it is. Is it to the left of the throttle body? I have the 302 efi. Also, where is the fuel pressure regulator. I think the diaphram may be ruptured. thanx for any help!
Freshman User
Joined: May 2002
Posts: 35
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From: Western USA
Need help solving rough idle problem.....
I helped a guy with a similar problem, after doing all that has been mentioned, it ended up being the TPS. Which explained why it ran good until it went into closed loop.
2 cents
2 cents
Elder User
Joined: Nov 2001
Posts: 892
Likes: 1
From: Duluth, MN
Need help solving rough idle problem.....
If it ain't broke.....change stuff till it is!
But the TPS was replaced last spring(1 year ago, right before I bought it). I guess it could be bad, but I pulled the EGR valve and cleaned it, and it runs good now. I am waiting on the IAC, and it should run mint then! IAC comes in tomorow. Hopefully I can get it sold then!!!!!! Thanx all!
But the TPS was replaced last spring(1 year ago, right before I bought it). I guess it could be bad, but I pulled the EGR valve and cleaned it, and it runs good now. I am waiting on the IAC, and it should run mint then! IAC comes in tomorow. Hopefully I can get it sold then!!!!!! Thanx all!
