Odd idle issue (something cycling at idle)

hodizz

Well-known member
Joined
Aug 10, 2009
Location
Charleston, SC
TDI
MK5 tdi (BRM)
Need some help-
Been noticing something cycling at idle
Best way I could describe it is about every 5-10 seconds - can hear/feel the car be smooth/ quieter - then its like something opens and the exhaust note changes a bit and gets a little rougher running-and just keeps cycling-- seems to happen once warmed up more that on first start up/cold.
Check for good vac on n75 / vacuum hoses ( all checked out good)
Replaced n75 to see if that might help ( did not )
Replace maf - No change
vnt actuator holds vacuum
No codes in system
no egr (deleted a long time ago)
maf / boost logs look good
replace brake booster line thinking maybe check valve might not be sealing at times - but that did not help
Any input or advice on where I should start looking or if any one else has had an issue like this -
 
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