Sallad

Where was it cracked?

wtmmm

I don't remember where it was cracked. The crack was not visible it was just a hunch from the VW technician. He had seen cracked TB on VW's and believed that was causing the surging in my car.

LarryJa

My "summer maintenance" list has grown.
I'll be taking August 4-10th off to engulf myself in it...
So far, the list goes:
replace spark plugs & cam cover gaskets
reseal cam tensioner covers, and replace sticking bank 1 intake cam solenoid.
Do a "seaform" gdi spray to reduce valve carbon
Replace MAP sensor & throttle body (w/adaptation)
Change engine oil & filter (hopefully, these will cure my mild cold engine surging)
Replace lubricant in all 3 differentials
Drain & refill the transmission
Replace rear brake pads
Paint front calipers
Grease front steering joints
Paint wheels
Those should keep me busy for the 5-7 days.

LarryJa

I finally replaced the throttle body & the surging is gone!

wtmmm

That's GREAT! Wish the Throttle Body was identified on my car sooner.

LarryJa

I believe that the surging is caused by mechanical wear, within the throttle's servo motor, allowing the throttle to have a small amount of "free play" that confuses the ecm, causing it to overshoot the throttle positioning, in either direction. Then the ecm compensates, & overshoots in the opposite direction, & it goes on....