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Got the check engine light last night and got the following:

 

7101: Lambda control adaptation, bank 1: system too lean   Upper limit value exceeded

 

7401: same as above, bank 2

 

Any ideas?  Odd, nothing came up on the Google.

 

Peace

Bruce in Philly

 

 

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Hmmm...... why do you believe this?  Is it above around the airbox and those big rubber hoses?  In other words, can I find it myself?

 

Thanx JFP

 

Peace

Bruce in Philly

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Hmmm...... why do you believe this?  Is it above around the airbox and those big rubber hoses?  In other words, can I find it myself?

 

Thanx JFP

 

Peace

Bruce in Philly

 

Because you are throwing the same overly lean mixture code on both banks, it has to be from excess air entering in a place that is common to both banks, the intake system.  Could be something as small as a broken or disconnected vacuum hose on the intake, or a loose clamp on the flex hoses, etc.  Time to start doing a detailed look around.

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Thanx man, I think I found it with your help..... but before I declare you "Master of all things Car", help me understand how this stuff works.

 

I think I had screwed on the oil filler cap incorrectly... I topped off the oil the morning I tripped the codes.  In my haste, I think I kinda cross-threaded it and it was crooked.  Could this be introduction of air into the system?  The car now runs smooth as silk... really well.

 

So, I also cleaned the MAF too so I want to be sure it was the oil filler cap.   The MAF is common to both banks.... couldn't the problem be from a faulty MAF?  Why is there a vacuum/air line from the oil filler tube/sump back into the intake?  Is this the PVC system?

 

Peace

Bruce in Philly

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Thanx man, I think I found it with your help..... but before I declare you "Master of all things Car", help me understand how this stuff works.

 

I think I had screwed on the oil filler cap incorrectly... I topped off the oil the morning I tripped the codes.  In my haste, I think I kinda cross-threaded it and it was crooked.  Could this be introduction of air into the system?  The car now runs smooth as silk... really well.

 

So, I also cleaned the MAF too so I want to be sure it was the oil filler cap.   The MAF is common to both banks.... couldn't the problem be from a faulty MAF?  Why is there a vacuum/air line from the oil filler tube/sump back into the intake?  Is this the PVC system?

 

Peace

Bruce in Philly

 

Yes, a loose oil cap will create a vacuum leak as the sump in under about 5 inches of water vacuum via the AOS, which gets its vacuum from the intake system.  A MAF is an electronic device, it cannot create a vacuum leak unless it fell off the car. ^_^

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