System too rich - Engine Hesitates Under load
#11
09-22-2009, 09:03 PM
Control Module Part Number: 4D0 907 551 AH
Component and/or Version: 2.8L V6/5V MOTR AT D04
Software Coding: 06252
Work Shop Code: WSC 02324
3 Faults Found:
17535 - Fuel Trim: Bank 1 (Mult): System too Rich
P1127 - 35-00 - -
17537 - Fuel Trim: Bank 2 (Mult): System too Rich
P1129 - 35-00 - -
17549 - Load Calculation Cross Check: Implausible Value
P1141 - 35-00 - -
Component and/or Version: 2.8L V6/5V MOTR AT D04
Software Coding: 06252
Work Shop Code: WSC 02324
3 Faults Found:
17535 - Fuel Trim: Bank 1 (Mult): System too Rich
P1127 - 35-00 - -
17537 - Fuel Trim: Bank 2 (Mult): System too Rich
P1129 - 35-00 - -
17549 - Load Calculation Cross Check: Implausible Value
P1141 - 35-00 - -
#12
09-22-2009, 11:24 PM
17549/P1141/004417 - Load Calculation Cross Check: Implausible Value
Possible Causes
* Mass Air Flow Sensor (G70) OR Manifold Pressure Sensor (G71) faulty
* Vacuum Lines faulty
Possible Solutions
* Check Mass Air Flow Sensor (G70) OR Manifold Pressure Sensor (G71)
* Check Vacuum Lines
* Check Engine Operating Conditions => Meas. Blocks
Special Notes
* Uwe: I think this code is set when the airflow being measured (or otherwise calculated) by the ECU doesn't make sense given other operating parameters such as RPM and throttle opening, manifold pressure, etc.
Possible Causes
* Mass Air Flow Sensor (G70) OR Manifold Pressure Sensor (G71) faulty
* Vacuum Lines faulty
Possible Solutions
* Check Mass Air Flow Sensor (G70) OR Manifold Pressure Sensor (G71)
* Check Vacuum Lines
* Check Engine Operating Conditions => Meas. Blocks
Special Notes
* Uwe: I think this code is set when the airflow being measured (or otherwise calculated) by the ECU doesn't make sense given other operating parameters such as RPM and throttle opening, manifold pressure, etc.
I would also look at the vacuum line going to the fuel regulator. Most are vacuum referenced in order to keep the pressure at a certain value above manifold pressure.
#13
09-22-2009, 11:26 PM
I would check the MAF once more. I heard some cases where new MAF sensors were bad. Check out the following website.
http://www.ross-tech.net/vag-com/adv...AF_TechTip.pdf
Other than that, the only thing that I can think of is to check the vacuum going to the fuel pressure regulator. It is a small cylinder looking thing above the intake manifold toward the driver side rear. Yes I know I said the vacuum may not be the issue before, but I am running out of options.
http://www.ross-tech.net/vag-com/adv...AF_TechTip.pdf
Other than that, the only thing that I can think of is to check the vacuum going to the fuel pressure regulator. It is a small cylinder looking thing above the intake manifold toward the driver side rear. Yes I know I said the vacuum may not be the issue before, but I am running out of options.
#16
09-22-2009, 11:35 PM
Speaking of fuel pressure regulators, it could just be bad too ....121k is about right for it to go.
#17
09-23-2009, 07:15 PM
Thanks Guys
I checked the vacuum line to the fuel pressure regulator it looked OK (still supple not brittle) but it was difficult to see the other end of it. It disappears under a bunch of connectors in the middle of the back of the engine. Where does the other end go?
If i have to replace the fuel pressure regulator is it a straight forward job? Am i gonna get covered in fuel?
I looked at the article you posted about the MAF and did a block group 032 it seems out of tolerance
cheers
I checked the vacuum line to the fuel pressure regulator it looked OK (still supple not brittle) but it was difficult to see the other end of it. It disappears under a bunch of connectors in the middle of the back of the engine. Where does the other end go?
If i have to replace the fuel pressure regulator is it a straight forward job? Am i gonna get covered in fuel?
I looked at the article you posted about the MAF and did a block group 032 it seems out of tolerance
cheers
#18
09-24-2009, 11:42 AM
It is just telling you that you are burning rich. One way of check is to just disconnect the MAF and check the measuring block 32 to see if you get the same result. If you do get the same result than it probably is not a MAF. If the o2 level goes up, then you probably have a bunk MAF.
#19
09-24-2009, 07:24 PM
I disconnected the MAF and ran it again. Both 032 values dropped to -25%
The 001 O2 banks fluctuated between -5 & +10%
The 001 O2 banks fluctuated between -5 & +10%
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