Wednesday, 4 April 2018

Golf GTI Edition 30 : PCV replacement

Started to get a frequent CEL for P0441 Evaporative Emission System Incorrect Purge Flow.
Cleared the code several times (using a generic obdII reader + phone + obd doctor free)
I was ignoring it (as its not harmful) until....

Drove the 20 mile commute into manchester, parked up and the car had a low idle and was 'hunting'
The boost gauge also showed the vaccum had dropped at idle (from 22in Hg to 16 inHg)!
The revs would also rise up to 2k by themselves then drop (with no throttle pedal)
Pulling dipstick = no change in idle, so it was time to dig out the PCV valve I had ordered from ebay a while back for this very eventuality!

2007 Mk5 Edition 30

As at 2018 the current is 

2.0T FSI PCV Valve  06F-129-101-R bought from ebay £43

Old Versions 06F-129-101-N, 06F-129-101-L, 06F-129-101-K (my old version), 06F-129-101-F, 06F-129-101-C

Revision K for revision R.
114,000 miles
Never been replaced so this was the version from the factory.

Easy change on the drive in the dark
  • Engine Cover off
  • disconnect 2 vaccum lines
  • undo 4 bolts and replace (i kept the old pcv gasket)
Note : I did not replace any other components i.e. the rear check valve

While replacing, I did try blowing/sucking the old and new valves.
Interestingly the old valve appeared to seal ok (in fact even better than the new one!) but when fitted it solved the problem.

vacuum level reverted back to 22 inHg at idle, now smoother.

In theory the MPG should also increase
I never noticed any drop in boost levels during this time

A great advert for having a boost gauge 

heres a pic of the OLD part number , vaccuum levels before(broken)/after(fixed)

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