Question about 2000 Volkswagen Jetta TDI

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2004 jetta tdi idles rough no smoke and runs great above idle

Posted by Anonymous on

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Anonymous

  • 91 Answers

SOURCE: running like bag of spanners

Classic sign of a clogged up fuel filter. Diesels tend to filter out water from the fuel at a larger rate than gas engines. Look for the water separator and empty it, than you may have to move to the fuel filter. These symptoms you describe are all indicitive of a poor fuel condition.

Posted on Aug 06, 2008

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Molson02536

Harvey N Tawatao

  • 3854 Answers

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

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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badealer888

Stan Cather

  • 414 Answers

SOURCE: 2005 jetta tdi high idle

If a/c, headlights,.. other stuff is on 950 is about right.

Posted on Jun 19, 2009

shocktroop40

John DeCosta

  • 155 Answers

SOURCE: i working on a 99 tdi jetta runs rough at low rpms

Usually white smoke is water or coolant. The compression test suggests the head gaskets are ok, but make sure the coolant is clean anyway. Is it possible the car has bad fuel? Water in fuel? Theres no ignition system to cause a miss, but if the diesel fuel isnt pure, it wont combust either. Honestly, I would try putting some good fresh fuel in it and see what happens.

Posted on Aug 11, 2009

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