highmileage
Veteran Member
- Joined
- Sep 17, 2013
- Location
- new jersey
- TDI
- 2005 passat bhw tdi (presently), 2001 jetta alh tdi (previously), 1998 jetta ahu tdi (previously)
While doing my regular scan with VCDS the other day I observed that the specified maf reading was 240 and actual was 460 or so. Having learned that the egr shuts off at idle and a tap on the accelerator turns it back on and balances these numbers, I did that. To my surprise on accelerator increase the actual maf reading did not decrease, but increased toward 600 range. I then shut the engine down, restarted and rechecked and it responded as expected (actual decreased). Then a third time and again no decrease in actual. Is this an indication that egr valve is failing, dirty or something else? Thanks in advance. BTW no codes and engine runs well. If I had not run vcds, I would be unaware of any issue.
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