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Discussion Starter · #1 ·
I'm trying to get rid of my C/E Light. I am running a Piper 264 Cam and a Garret Ver. 11 Chip on my 1998 GTI VR6. I am getting the Idle Adaptation at Limit code. My check engine light is on most of the time but occasionally resets itself.
I read the following posts on this topic:
http://forums.vwvortex.com/zerothread?id=126763
http://forums.vwvortex.com/zerothread?id=38017
which recommended cleaning the throttle body.
I took my car to an independent VW mechanic and he checked the throttle body. He said it was clean and that the throttle plate was not "cruded up".
What do you guys recommend?
Can I replace the Garrent ver. 11 chip with the stock chip to see if that clears up the C/E light problem. Can I run the Piper 264 Cam with the stock chip instead? are there any implications when doing this?
Currently, I'm getting pretty poor gas mileage. If I put the stock chip back in, will I see any significant improvements in gas mileage?
Thanks for the help.
 

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Re: C/E Light code: Idle Adaptation at Limit, Piper 264 Cam & Garret V11

Check the vac lines around the ISV and EGR for leaks as well and all the intake boot connects. Also check the position of the dashpot behind the throttle cable stop itself. In general, and very simple terms, what the car is trying to tell you is it's idling so rough and irratic that it can't compensate using the "fudge factor" the ISV is meant to work within.
Ed-92SLC
 

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Re: C/E Light with the code: Idle Adaptation at Limit

OBD II cars do not have an ISV (or IAC valve).
But you should check for vacuum leak around the throttle body and between the halves of the intake manifold.
If you have access to a scan tool, try re-running the idle adaption. If you can do so, then you can also try adjusting the idle utilising the scan tool as well. You canchange the idle speed as much a 800 rpm utilising this method, which should stop the recurring CE light.
If the throttle body wil not re-adapt, however, try either a) running the stock chip, b) getting another chip for comparison, or c) the throttle body itself may be faulty
 

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Re: C/E Light with the code: Idle Adaptation at Limit (splitmeister)

If it's the throttle body I have a stock OBDII off a 97 VR available.
Ed-92SLC
 

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Re: C/E Light with the code: Idle Adaptation at Limit (Ed Casey)

Idle adaptation is is the mixture adjustment that the ECU will
do to maintain emissions at idle.
Get a VAG-COM tool and look at ECU group 25 (I think)
You will see the 'idle adaptation' value. If the value is -25%
then you are too rich at idle. If the value is +25% then you are
too lean at idle. This value also affects how the MAF is iterpreted
for the rest of the rpm range.
You may not actually be to rich or too lean. Probably are.
Take a look at the MAF signals, should be around 0.8V to 1V
at idle, or roughly 5 to 11 g/s (depends whether engine is hot
or cold). You should be flowing around 150-160 g/s near redline.
Do some data logging....
Are you running anything else....different regulator, different injectors.
Check these too and also the pump. The pump should flow at least
90 lph @ 400 kpa.
Good Luck,
Jeffrey Atwood
 

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Re: C/E Light with the code: Idle Adaptation at Limit (Jefnes3)

quote:[HR][/HR]Get a VAG-COM tool [HR][/HR]​
where can i get the compu to read the VW code? or the program/inerface?
 

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Re: C/E Light with the code: Idle Adaptation at Limit (Jefnes3)

can the VAG-Com adjust the idle for the MK4 Vr6 with the electric throttle? I've got cams and a garret chip on my mk4...and the idle is pretty rought too...I would like to raise the idle without talking my computer out to send it in for reprogramming...
 
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