Question about 2002 Volkswagen Jetta TDI

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Idle seems a bit high. Need to know how to adjust and what RPM

What is the proper RPMs at idle for a 2002 Jetta TDI? Also how do you adjust the idle? Mine is idleing at about 850 RPMs which seems a little high. Thanks

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  • lfnharbor May 22, 2009

    Wow that was a fast response. Thanks

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  • Volkswagen Master
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There are a couple of things that come to mind. One is make sure the EGR Valve and intake manifold are not carboned up. I normally have to clean them every 60 to 80,000 miles. It will actually close up with Carbon and restrict air flow and make the EGR valve malfunction. 
Secondly, the diesel pump may just have a lot of wear and it is putting out too much fuel at idle. The only way this can be checked is by the dealer with a VW specific scan tool such as VAG-COM. With this tool, you can go in and look at the the pump timing and start injection quantity. 
I have the start injection quantity many times but you have to have the software and login to get the readings. Most dealers will not do this but would rather sell you a pump if it is off.
Remove the hose from the intake where it connects to the EGR valve and look at the inside with a flashlight. See how much carbon is accumulated. This may not solve this problem but will help with starting and performance issues if corrected.

Good luck and hope this helps. To adjust the Idle, it needs to be programed in to the ECM so i am thinking that it's a Carbon issues that is restricting the air flow which the ECM is compensating to keep the engine from stalling.

Posted on May 22, 2009

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