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Ran sea foam and changed the fuel filter didn't work any ideas?
On what are you basing your conclusion that the engine is running lean--actual observation of the AFR via a wideband O² system or DTC codes? If the latter what are the codes?
 

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Discussion Starter · #3 ·
On what are you basing your conclusion that the engine is running lean--actual observation of the AFR via a wideband O² system or DTC codes? If the latter what are the codes?
Im getting 2 codes saying bank 1 is stuck lean and bank 2 is stuck lean i can tell you the codes when i get into the car.
 

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Im getting 2 codes saying bank 1 is stuck lean and bank 2 is stuck lean i can tell you the codes when i get into the car.
The exact codes are important...
 

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Do you have any intake (after the MAF) or exhaust leaks?

Also that is a pending code, had you cleared the codes previously? If so when you observed the codes before were they pending or persistent?
 

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Discussion Starter · #7 ·
Do you have any intake (after the MAF) or exhaust leaks?

Also that is a pending code, had you cleared the codes previously? If so when you observed the codes before were they pending or persistent?
I had 2 confirmed codes and 2 pending. 2 confirmed were the one in the picture and bank 1 system stuck lean.
How would i check for leaks? These codes came on after i cleaned my k&n filter and TB.
 

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I had 2 confirmed codes and 2 pending. 2 confirmed were the one in the picture and bank 1 system stuck lean.
How would i check for leaks? These codes came on after i cleaned my k&n filter and TB.
As you say you just cleaned a K&N filter one thing to check is that the MAF has not been contaminated with the snake oil. Examine it and if it looks shiny/oily clean it (gently) with MAF cleaner.

Also as cleaning the TB (which never really needs to be done) requires removing the intake tube make sure the tubes feeding the IAC and PCV system are properly connected...
 

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As you say you just cleaned a K&N filter one thing to check is that the MAF has not been contaminated with the snake oil. Examine it and if it looks shiny/oily clean it (gently) with MAF cleaner.

Also as cleaning the TB (which never really needs to be done) requires removing the intake tube make sure the tubes feeding the IAC and PCV system are properly connected...
+1 on the MAF cleaner, I have the same problem and have tried everything to fix it and someone with the same year mustang told me that he had replaced his cam position sensor and it went away, not sure why the correlation or if it helps but it worked for him and I might try it soon
 

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I get an occasional codes for both banks running too rich and while it's the opposite if yours, these are fuel trim adjustment codes. Usually this relates to issues with tuning. Sometimes when I lift off on the highway for a downhill section or something it tries to run rich and the fuel trim system makes an adjustment that actually sets off the sensor and trips the code. My actual a/f ratio only actually changes by less than a quarter point.
 

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Discussion Starter · #14 ·
I get an occasional codes for both banks running too rich and while it's the opposite if yours, these are fuel trim adjustment codes. Usually this relates to issues with tuning. Sometimes when I lift off on the highway for a downhill section or something it tries to run rich and the fuel trim system makes an adjustment that actually sets off the sensor and trips the code. My actual a/f ratio only actually changes by less than a quarter point.
My car is not tuned. And ever since i did my intake manifold stuffs just been doing down hill. Someone told me i might be having a tuning issue but im not to sure on that. When your code comes up is it confirmed ? Ill erase the codes then when i shut her down and start her back up they come back instantly or they will be on within the next 5 minutes.
 

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Discussion Starter · #20 ·
Should i try that first, this only started happening rite after i cleaned my k&n filter and cleaned my TB with carb cleaner. Cleaned the mass air flow after then just switched it cleaned the ICA valve ran sea foam threw the intake and gas tank then changed the fuel filter
 
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