2011 Jetta TDI - heavy white/gray smoke heavy diesel smell

   #1  

fin reaper

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I just bought this car recently; the mechanic of the person I bought it from said the turbo needed to be replaced due to the smoke, but after having this car for a few days, I'm thinking injector seal or injector issues. The smoke is heavy from idle and during acceleration, gray/white and smells of unburnt diesel - it really doesn't smell like burned oil to me.

Warm compression is 350, 340, 350, 325 psi.

Can any of the VCDS blocks help me identify injector or injector seal issues?

I don't have any fault codes related to injectors.

I won't be able to post a VCDS log until next week when I get back home.

What do you guys think? Anywhere else I should look before pulling the turbo?
 
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IanC

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My VW Golf 1.6TDI (2012) occasional does this in cold, damp weather and it often happens just before a Diesel Particle Filter warning light. When the engine is warm (after 10 mins) the smoke stops so I take it on a long drive to re-generate the DPF - it will happen again after a few weeks of short journeys, first symptom is smell of unburnt fuel.

Does the smoke from your car stop once the engine is warm? You could try a DPF re-generation just in case it is starting to get blocked - I think there is a code to see when this last happened and a way to force a re-generation to occur. I've just started using VCDS so can't say where to find these options - good luck !!
 
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fin reaper

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It smokes cold or warm. To troubleshoot, I removed dpf to check turbo outlet - no change.
 
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fin reaper

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Block 13 looks great. -0.07mg/str to 0.16 mg/str. I pulled the fuel return from the injectors and diverted them into individual water bottles. All injectors output about the same volume while running - no outliers. Still heavy white-gray smoke. Not sure where to go now
 
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HMC

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Hi fin reaper,
You say " I don't have any fault codes related to injectors. ", does that mean there are dtc's for other things?
Have you checked the EGR is functioning correctly?
Regards HMC
 
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fin reaper

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No egr codes.. I pulled the #4 injector and hooked it back up out of the engine. I put the nozzle in a plastic bottle and saw dripping and spray from #4 while the engine ran on the other 3 cylinders.

Next I'm going to run a bottle of dedicated diesel purge through the hpfp.
 
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fin reaper

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Just closing the loop. I flushed the injectors, mid pump and hpfp with diesel purge,, bypassing the filter canister. No change. I replaced #4 injector, car still smoked. Ended up replacing all the injectors and now it doesn't smoke and no codes!.

Before I started replacing injectors, I did drain the tank and replaced the fuel filter, then added fresh fuel.
 
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Uwe

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Ended up replacing all the injectors and now it doesn't smoke and no codes!.
Since you haven't posted a scan, I gotta ask: How many miles were on it?

-Uwe-
 
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fin reaper

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Sorry, will do when I get home.

It currently has 127k miles. When I pulled the original injectors, there was a heavy yellow film on the injectors between the copper crush seal and the oring, almost oil like in texture, but very yellow, similar to UV additive in the AC system.
 
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