It won't Idle
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Freshman User
Joined: Jun 2006
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It won't Idle
I have a 98' Expedition that one day was starting, idling and running good. After sitting a couple weeks....it starts, but won't idle, but runs good. Even after warming up and driving for awhile it doesn't want to idle when you come to a stop???? Any ideas??
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Joined: Jul 2006
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Go over to whichever local auto store you have and get the list of codes it's throwing. I'll bet you have a 171,174, but get them all. Have you fixed the vacuum hoses coming off the PCV valve yet? Your symptoms sound just like mine, '98 expy, 82,000 miles. 2 vacuum leaks, 55 dollars, no more problems.
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Iac
on my 2000 Nav 32v engine the IAC is just under the plastic cover that has the lincoln emblem on it(held as someone said with three bolts)---as you face the front of the engine the IAC will be slightly right of center. It is silver color, about 3in long cylindrical in shape -- maybe an inch in diameter---held in place with only two bolts and there is a gasket---one electircal connection on the end. Mine is easy to get at - right on top of the engine. You can take the IAC off and I spray in carb cleaner in the open end of the valve and then after all the soot is out I usually lube it a little with CRC or WD40---let all that dry and replace it---costs you nothing and if it's not your problem it probably could use cleaning anyway.
As someone above suggested -- check the PCV line too---mine are still in good shape but lots of folks having cracked elbows in that line. Examine very carefully--they can crack where it's hard to see. I've also heard they get soft and can collapse even though they look fine.
As someone above suggested -- check the PCV line too---mine are still in good shape but lots of folks having cracked elbows in that line. Examine very carefully--they can crack where it's hard to see. I've also heard they get soft and can collapse even though they look fine.
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Freshman User
Joined: Jun 2006
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It IDLES!! The IAC valve was the problem....took it off cleaned and lub'ed it and it idles perfect now. Thanks to everyone for all the good info.!!!!
Now for the CEL...still on. I'm going to check the codes this weekend, but Ithing as stated it was a 171 or 174...something about the Engine Exhaut Gas Return...i think? Any ideas on this one?
This web site rocks!
Now for the CEL...still on. I'm going to check the codes this weekend, but Ithing as stated it was a 171 or 174...something about the Engine Exhaut Gas Return...i think? Any ideas on this one?
This web site rocks!
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Joined: Jun 2003
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I don't remember exactly where on an Expy, but you can find a silver tube running up from the driver's side wxhaust manifold up to the top of the engine. It will terminate at a t shaped rusted cast iron item (with a circuar diaphragm on top) that is connected to the intake by two studs. That's the EGR valve.