Idle problem
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From: Oregon
Idle problem
I have a rough idle on my 92 explorer when its hot or after starting it cold. I have replace plugs, wires, iac, and fuel filter. Does anyone have any ideas that would cause a rough idle. after starting it, it runs rough and dies if i press the gas.
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From: UT
Originally Posted by 1984 f-250
Do I have to have a guage to test if i have a vacuum leak?
1) Get under the hood and trace vacuum lines. Make sure all the lines are connected, intact, or capped off.
2) You can also use a stethoscope to listen for vacuum leaks (the sound of hissing air).
3) I've never done this, but they say you can "spray" propane or equivalent around vacuum lines, etc. If there's a vacuum leak, the idle will go up or something when your propane passes near the leak. Of course, you've got to be careful with something like this.
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From: Pauline, South Carolina
Originally Posted by 1984 f-250
I have a rough idle on my 92 explorer .........it runs rough and dies if i press the gas.
Good Luck and Happy New Year..........
Postmaster
Joined: Dec 2001
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From: UT
Didn't get any codes as in "no codes at all", or didn't get any as in "all pass codes (111)"? Running rough like it is, I would have at least expected a 411 or a 412 from the KOER test.
Have you tested fuel pressure, yet?
Does the rough idle seem like a misfire? If so, could you perform a cylinder balance test to see if the fault is isolated to one cylinder?
Have you tested fuel pressure, yet?
Does the rough idle seem like a misfire? If so, could you perform a cylinder balance test to see if the fault is isolated to one cylinder?
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Joined: Dec 2001
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From: UT
No codes at all has two general causes:
1) Operator error. There seem to be some incorrect or hard to follow instructions for the EEC-IV self-tests out there. I like the set at www.dalidesign.com/hbook/eectest.html start reading at tests. If you have specific questions on how to run the test, post them and we'll try to help.
2) Problem with the computer/wiring. A bad connection between the computer and the self-test connector may not explain your driveability problems, but other computer faults certainly could. In this category are things like bad power supply to the computer, bad ground, internal fault, etc. 1st, make sure your following the correct procedure in pulling codes. If you're doing it right, then I would suggest figuring out why you can't get codes. You just might find out why the truck won't run right.
1) Operator error. There seem to be some incorrect or hard to follow instructions for the EEC-IV self-tests out there. I like the set at www.dalidesign.com/hbook/eectest.html start reading at tests. If you have specific questions on how to run the test, post them and we'll try to help.
2) Problem with the computer/wiring. A bad connection between the computer and the self-test connector may not explain your driveability problems, but other computer faults certainly could. In this category are things like bad power supply to the computer, bad ground, internal fault, etc. 1st, make sure your following the correct procedure in pulling codes. If you're doing it right, then I would suggest figuring out why you can't get codes. You just might find out why the truck won't run right.
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Joined: Jul 2004
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From: Winnipeg, Mb. Canada
I was having some serious idle issues with my '94 and I also didn't get any codes. Cleaned the MAF and changed the IAC, but still the same problem. Turned out to be a faulty computer. The tech used a jumper to bypass the idle control on the computer and it ran fine. Put the new computer in and all was fixed. Your problem sounds eerily similar to mine. If you got a buddy with a similar explorer, you could try swapping computer modules to rule it out or confirm.
Good luck
Good luck
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