Question about Cars & Trucks
Jetta 2.5 surging idle
SOURCE: Surges in RPM while at idle
It may be one of two things. A intermittent problem with the idle air control sensor or the throttle position sensor. Have the cars computer scanned at a local auto parts store to see if there is a pending code that has yet to turn on the check engine light.
Posted on Apr 22, 2010
There is no manual adjustment for timing, this is done digitally by using a VAG 1552 scan tool or equivalent. Now if timing mark is all you need just to serve your curiosity then there are a couple.
Set engine to TDC for cylinder #1 by turning the crankshaft until timing mark on flywheel or torque converter aligns with marks on the transmission case.
Remove upper toothed belt cover. Once removed, you will see the letters O.T. with an arrow on the upper rear toothed belt guard. Check that mark on camshaft pulley is aligned with mark on toothed belt guard. This brings camshaft to TDC for cyl. #1.
It is unlikely that a belt has skipped a cog, but if that happens your engine will run very rough or not operate at all. You might have other issue in the air metering sensors (MAF) which doesn't take account of temperature. That means whether the engine is cold or holt it will always run rough and definitely activate an MIL.
Posted on Jun 06, 2010
Most VW are interferance motors. That would mean the pistons could have hit some valves. I would stay away.
Also have you seen the motor? I may be off but I thought the VR6's had a chain. Even if, its still an interfernce motor.
Posted on Oct 07, 2011
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