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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW MKIV-A4 TDIs (VE and PD)

VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old November 7th, 2013, 16:25   #1
corzy
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Join Date: Sep 2008
Location: petrolia ontario
TDI(s): 99 jetta
Default turbo underboost

hey guys, got an engine alarm P00299 turbo-underboost
we have only owned this car for a month or so, the prior owner safetied the car 20 k before we got it, but it sat for over a year outside. not sure if this could have caused the turbo to corrode or something like that?
any suggestions.
the car is sluggish ( im used to it owning a 99 tdi with a non operational turbo, top speed is 130k, downhill, with wind )
so im not too worried, i know it will drive fine, just no get up and go, but soon i might tackle it...maybe.
i found online that you can only get this turbo with the exhaust mani, 850 from Germanautoparts...or just the vane itself for 100ish.
not sure how i could tell what the actual issue is.

thanks guys
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99 Jetta TDI <99.5 AHU
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Old November 7th, 2013, 16:26   #2
corzy
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Location: petrolia ontario
TDI(s): 99 jetta
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sorry, forgot to say that the car is a 2003, with 220000 km. TDI obviously, and is loaded, power,leather,moonroof etc (if all that matters)(
thanks again
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Old November 8th, 2013, 22:20   #3
Monster1926
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Join Date: Jul 2012
Location: Youngstown, oh
Fuel Economy: 45 mpg
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Turbo actuator is rusted out its easy to change from the bottom search turbo actuator
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Old November 9th, 2013, 03:31   #4
corzy
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TDI(s): 99 jetta
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how can i tell if it is rusted out or ceased, can you watch it while the cars running? do you do this from under the car?
thanks
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Old November 9th, 2013, 11:11   #5
Ridelife
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Join Date: Jan 2012
Location: North FL
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the vacuum line that goes to the turbo. you take a mitivac and pull vacuum on the actuator which looks like a waste-gate (google if nessessary). there is a rod mounted to a move-able shaft. when you pull vacuum like 20 psi it should start to move (the rode that is) and go back into the actuator. i would say it moves about a inch and a half with full suction or to the stopper which you probably cant see. if it doesn't move then actuator is probably frozen.
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Old November 9th, 2013, 18:03   #6
Monster1926
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Or in my case my mighty vac just kept pumping because it was rusted out. My car spent most of its life in Seattle so I'm sure snowy areas are worse
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