Question about 2003 Volkswagen Jetta TDI

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2003 tdi automatic, smokes black on every start

I've had the car since January of this year, my mechanic tells me to put a bottle of John Deere conditioner in the tank with every fill, which I do.
When driving around town I leave the transmission in 2nd gear to that it revs high. My mechanic has also opened the air intake and cleaned it manually. None of these things have had much of an effect.

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Unless you want to scorch the nozzles and risk burning a hole in a piston, do NOT use John Deere conditioner in a TDI. The injection pressures/nozzles are not tolerant of John Deere conditioner. smoke = bad.....high egts....and high egts = melting valves.  Smoke means soot, soot clogs the intake manifold and the vanes in the VNT, And soot from the EGR system. And once that soot is in there, it can harden to what you swear is something melded with your intake manifold's metal. Black smoke on a diesel is power you can see but not use, and the amount of over fueling required to produce it can have disastrous effects on the life expectancy of your engine. Melted or holed pistons, coked up injector tips, coked up rings, stuck vanes in the VNT turbo, all problems that can arise from a TDI that's constantly and consistently over fueled past the smoke limit. Leaving it in 2nd gear will have the turbo revving at a high rate and waring it out prematurely and can cause damage to the Vanes in the VNT for constant over boosting due to high revs. Good luck and i'ld look for a different mechanic who under stands Modern Diesel Racine Design Engines. 

Posted on Jul 01, 2009

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