Running Lean
Thread Starter
Joined: Nov 2007
Posts: 15
Running Lean
I've got a '01 Mustang with a 3.8L and an engine code that says its running lean on the number 1 bank. You guys think some fuel injector cleaner and replacing the airfilter should do the trick or is this most likely a more serious issue?
4th Gear Member
Joined: Mar 2006
Posts: 1,659
From:
RE: Running Lean
try maf i been having the same problem with my car and it is a night mare i still cant figure out why my car is still doing this problem my car is running so lean that when you push the clutch in it will stall because the motor is getting tight and temporarily siezing running lean is a very very serious problem so first try with mass air flow and work from there
Gentleman's Relish
Joined: Feb 2005
Posts: 13,188
From: AZ
RE: Running Lean
If he was running Lean on both banks I could see the MAF being the issue but since it only affects one side, I would have to saythe front 02 sensor is bad on that side (Bank 1 = passenger side). Try swapping your front O2 sensors. If the problem follows the sensor (would read 'Running lean bank 2) then you found the problem.Replace the 02 sensor. If it doesn't follow the swap but remains on the same side, then you may have a clogged injector.
4th Gear Member
Joined: Jan 2007
Posts: 1,758
From: Eureka, Ca.
RE: Running Lean
ORIGINAL: Derf00
If he was running Lean on both banks I could see the MAF being the issue but since it only affects one side, I would have to say the front 02 sensor is bad on that side (Bank 1 = passenger side). Try swapping your front O2 sensors. If the problem follows the sensor (would read 'Running lean bank 2) then you found the problem. Replace the 02 sensor. If it doesn't follow the swap but remains on the same side, then you may have a clogged injector.
If he was running Lean on both banks I could see the MAF being the issue but since it only affects one side, I would have to say the front 02 sensor is bad on that side (Bank 1 = passenger side). Try swapping your front O2 sensors. If the problem follows the sensor (would read 'Running lean bank 2) then you found the problem. Replace the 02 sensor. If it doesn't follow the swap but remains on the same side, then you may have a clogged injector.
+1, it's NOT the MAF if it's only lean on one bank and it's not the air filter either.
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