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Rough Idle no codes

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Old Mar 20, 2008 | 03:04 PM
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donniesd
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Rough Idle no codes

I got a check eng Light. Went and had the sparkplugs and Boots changed, all 8 and fuel filter.

Now i am getting a rough idle. But if i put it in neturel, it goes away. But in park or drive it is rough. I am not getting any codes.


Where esle should i start to look.
 
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Old Mar 20, 2008 | 03:06 PM
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donniesd
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Forgot to add.


1998 Navigator 4X2 173K Miles.


Been searching. Where is the IAC valve. What is the best way to clean it.
 
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Old Mar 20, 2008 | 03:20 PM
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Iac

The IAC is on top of the engine---about the easiest thing to work on---it's round---lays horizontal---is usually shiny zinc chromate color---has a wire harness connected to it on the end---and comes off with two small bolts--may be hex---I don't recall

With your kind of mileage---I'd just replace---but I have cleaned em---there is a small gasket---that should be reusable if you clean it.
 
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Old Mar 20, 2008 | 03:31 PM
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Originally Posted by Trucker22
I'd just replace
Thanks for the help. I think your right. Cant hurt. They are 50 bucks.
 
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Old Mar 21, 2008 | 10:05 AM
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Yes, do check/clean the IAC valve. This only takes 15 minutes. Also, check all vacuum lines for leaks and hisses.
 
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