Since this is basically the same motor as a Passat 1.8T, I figured I would ask this here... cause I'm avoiding Vortex.
A buddy of mine has a 02' GTI 1.8T (AWW). He recently had a CEL come on, so I broke out the Vag-Com. Can't remember the code exactly, but it was Bank 1 O2 sensor - System too lean. Had to do with unmetered air getting in the engine causing lean conditions. I checked and confirmed that all vacuum lines were okay. After doing a few 3rd gear runs, I noticed that the MAF numbers were only peaking at 70g/s or so. Right there, I assumed it was the MAF sensor that is bad. However, I also noticed that his boost is only peaking at about 6.5psi. The weird thing is, the car doesn't feel slow at all (it is basically all stock... no chip or anything). The requested boost is only showing about 5.5psi.
I still believe that the MAF is bad, but before I have him drop $130 on a new one, I figured I would get some other opinions. Do you think the low boost is causing the low MAF numbers, or vice-versa? I just don't know if having low MAF numbers would somehow cause the requested and actual boost number to drop, or there is a boosting issue, which is causing low MAF numbers.
I am at work now, so I can post any logs, but if needed, I will when I get home tonight.
Other things checked:
-Air filter is clean
-DV is a new 710N
-N75 is measuring 30 ohms.
Thanks in advance. :thumbup:
A buddy of mine has a 02' GTI 1.8T (AWW). He recently had a CEL come on, so I broke out the Vag-Com. Can't remember the code exactly, but it was Bank 1 O2 sensor - System too lean. Had to do with unmetered air getting in the engine causing lean conditions. I checked and confirmed that all vacuum lines were okay. After doing a few 3rd gear runs, I noticed that the MAF numbers were only peaking at 70g/s or so. Right there, I assumed it was the MAF sensor that is bad. However, I also noticed that his boost is only peaking at about 6.5psi. The weird thing is, the car doesn't feel slow at all (it is basically all stock... no chip or anything). The requested boost is only showing about 5.5psi.
I still believe that the MAF is bad, but before I have him drop $130 on a new one, I figured I would get some other opinions. Do you think the low boost is causing the low MAF numbers, or vice-versa? I just don't know if having low MAF numbers would somehow cause the requested and actual boost number to drop, or there is a boosting issue, which is causing low MAF numbers.
I am at work now, so I can post any logs, but if needed, I will when I get home tonight.
Other things checked:
-Air filter is clean
-DV is a new 710N
-N75 is measuring 30 ohms.
Thanks in advance. :thumbup:
