Question about 1998 Mercury Mystique

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2001 Ford Explorer Sport running too lean in both banks

I have a 2001 Ford Explorer that is running too lean in both banks. It will not idle in cold temp. but does fine in the summer. Last year the check engine light went out when the weather was warmer and the truck acted fine. This summer the truck is still seems to be running ok now that it is warm again but the light is staying on. I put it on the computer and it told me that both banks were running too lean. would the IAC valve couse this or the tps sensor? Any help would be greatly appreciated.
Thanks

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  • 31 Answers

Any of those sensors can cause that but the best thing to do is scan it or check for a vacuum leak with a smoke machine.

Posted on Jul 22, 2009

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Both banks are running lean meaning they are getting too much air and not enough fuel.
To start I'd try an expensive can of fuel cleaner which may just clean up your system enough to clear the codes.
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jackiaria

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