lean bank
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#4
The P0171 is for "A" bank and not both banks so for now I would not be looking for a leak. I am thinking you are having a problem with fuel presentation on "A" bank. Get yourself a can of BG44k and add it to your fuel and see what takes place. Your problem could be something other than this but for now try this. You can get BG44k at most dealerships or auto repair shops. Give this a try first.
Gus
www.jagrepair.com
Gus
www.jagrepair.com
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#8
Sorry to be pedantic but it tries NOT to run richer or leaner. It tries to add fuel to compensate for the unmetered air to get back to the proper mixture. But yes it will overall tend to run rich since it will add too much rather than too little extra fuel because running lean destroys engines whereas too rich "only" destroys cats, which are cheaper. Ideally it would exactly compensate but leaks aren't so helpful as to be consistent!!
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