varying boost - what to log

cleaver

Veteran Member
Joined
May 8, 2006
Location
Berwick, Nova Scotia
TDI
None - did own '01 and '02 Jetta TDI
I have issues with my boost at WOT. It bounces from 6-20psi...I just replaced the VNT actuator and all hoses.

I am going to use VCDS to get some more info, what should I log?
 

Curious Chris

Top Post Dawg
Joined
Jun 11, 2001
Location
Pineview GA
TDI
Jetta Wagon 2003 RIP Rockford IL
Log MAF specified, MAF Actual, MAP specified, MAP actual, and throttle position. Then warm engine, 3rd gear, 100% throttle, 2000-5000 rpm, repeat 3 or 4 times.

I am guessing either boost system leak or screwy MAF. I have seen screwy MAF's that bounce all over causing boost to jump up and down. I also had a OMI break a bracket that gave me an intermittent leak and cause my boost to meander. The 100% throttle eliminates adaptation.
 
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