Idle problem

THE_HYDROXIDE_CHILD

MEMBER
FORD F-150

I have a 93 ford tempo got like 150K miles. It started having idle problems like when ur driving the car it will idle alot higher than normal. And if u push the clutch in and put it in neutral while driving then release the clutch it will idle really high until u come to a dead stop. Unless u stop it wont idle down. Then once u stop it takes like 10 seconds. But its idles down. Repalced the MAF sensor and the idle air control valve. We even replaced a bunch of cracked vaccum hoses. Im just lost with this one. Cuz when we unplug the iac the idle never has a single problem. But the valve is brand new. Im just lost

5 Replies

BLACKOP555

MECHANIC
10,371 POSTS

Any trouble codes?

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Tuesday, May 22nd, 2007 AT 9:31 PM

RUDPRO

MECHANIC
224 POSTS

The IAC gets a signal from the computer. The computer gets information from the O2 sensors to adjust the idle. You might want to chek that.

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Wednesday, May 23rd, 2007 AT 2:27 AM

THE_HYDROXIDE_CHILD

MEMBER
82 POSTS

No, there is no trouble codes at all. Which is wierd. Ill check the 02 sensor

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Wednesday, May 23rd, 2007 AT 10:16 AM

RUDPRO

MECHANIC
224 POSTS

You also said you replaced cracked vacuum lines. I would do a thorough check of the vacuum system again. A small leak could be causing it. Also, the IAC valve could be defective even if it's new. I have bought new parts before and they were defective out of the box. It almost sounds like the new IAC valve could be hangng up or working very slowly.

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Wednesday, May 23rd, 2007 AT 11:15 AM

J_KUNATH

MEMBER
2 POSTS

I had a sim. Situation and it ended up being a leak around the intake gasket. Take some starting fluid or carb cleaner and spray around the base of the intake where the gasket is. Hope this helps