I changed the glow-plugs in 93 300D 2.5L Turbo.

After installing, car starts fantastic. Before, it had all the taletell characteristics of bad gp's along with a gp dash light that stayed on constantly.

After installing gp's (all five were replaced, with new intake manifold gasket and crossover gasket) the exhaust is trailing a constant whitish smoke that was only present on startup with bad gp's. Yesterday, I tested the car on 5 mile trek and when I came back the smoke was gone (including at idle). However this morning, I started up and there is that darn foggy looking smoke again.

While allowing the car to idle, I placed my hand near the exhaust and it smelled like unburned fuel...an almost rich smelling mixture of unburned fuel.

That said, I have a few questions:

1. Could the interior cleaning of the manifold caused the unusual smoking? Could there be some loose soot debris that was inhaled somehow into the cylinders since I removed as much soot from every orifice I could find during the gp changeout?

2. By removing the crossover from the turbo, is it possible that there are some issues with the turbo wastegate or the operation thereof that were affected by the crossover removal?

3. Are there computer issues?

4. Is the manifold not seated properly causing air to leech into air intake system and cause the computer to sense it overcompensate with a code to enrich the fuel/air ratio?

Before posting, the whitish smoke was only present on start-up with bad GP's but even then it ceased within a few minutes after warmup. Now it is a constant smoking while idling but once it is taken on a test drive the whitish smoke is gone.

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1993 300D 2.5L 240,000+ miles

I am also interested to hear a response for this, my 87 smokes on startup too. I replaced a few GPs that I could get to without pulling the intake, but one of these weekends I'm going to do the whole job properly (like you did).

I've got 4 new GPs (#1 and #2 already replaced), new intake gaskets, an EGR delete kit and a few other goodies I've been saving for a weekend job.

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-justin

1987 300TD, 1987 300TD
2008 R32, 2000 Passat Wagon