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View Full Version : hesitation and bog VAG-COM DTCs trouble shooting help



runvsofme07
07-28-2010, 08:55 PM
00 A4 1.8t qtm
I Bought a E-bay cable and downloaded VCDS Lite.. Now i had codes for Mult Bank System Lean 1 and a Cyl. 1 Misfire intermittent..
Logged at 100% throttle 4th gear run DTCs cleared..
001)Lambda % and it maxed at 25% and held that value..
002)Mass Airflow maxed at 63.9%@2600rpm and slowly dropped, load was around 50 g/s @ 4600rpm no point of reving out cause the power was not there.
003)@4600rpm and MAF 51.5 g/s, timing was at 28.5...

im bout to go log some more data, any pointers on what i should do?
It just got the timing belt/head job done..and i cant adapt the throttle with shareware.. im going to wait for the codes to come back n log it then too..

turbo_bootin
07-29-2010, 03:50 AM
Those MAF numbers are way off. You should be about double that at WOT (120 g/s I think). Sounds like a bad MAF to me. Try cleaning it first though.

runvsofme07
07-29-2010, 07:34 AM
Ive heard carb cleaner n letting it completely dry.. The 17536 came back last night.. And the maf still reads low.. The o2 sensor failed or incomplete most the test.. Can i clean it too..? Should that lambda go above 25%..

brfooser
07-29-2010, 11:35 AM
agree with bootin appears to be a bad maf