I have been experiencing some issues with my turbo. It is not operating at optimum efficiency triggering the engine light to come on with code P0234 turbo over boost.

After speaking with Keith at Green Diesel Engineering regarding this code, he said that it was probably caused by the bad fuel I accidentally ran thru my jeep about 4 weeks ago. He suggested I try to free up the turbo vanes by using a vacuum pump several times and then take the vehicle out for a spin and try flushing out the crud by hard driving it and flooring it and allowing the turbo to work hard and spool itself free. I found that this does work to a point and works best when going up a steep hill from a dead stop and flooring the pedal to the metal then doing it again, and again, and again.

I did this several times (7) and I noticed an improvement, but it is still not right and the engine light always returns.

I searched the web for ways to clean the turbo without removing it and I came upon a forum on the VW TDI club where members stated that using Heavy Duty Oven cleaner cleans the encrusted carbon buildup on the turbo charger without removing it.

It seems that oven cleaner was used to dissolve the carbon buildup surrounding the turbo and then flushing it out by driving the vehicle hard, allowing the fumes and the crud to blow out the exhaust.

You can read it here: http://forums.tdiclub.com/showthread.php?t=246287

Turbo maintenance is in our future, and learning how to clean our turbo would be worthwhile.

Has anyone heard of this or tried it?

How would we get a stream of oven cleaner into the exhaust part of our turbo charger without removing it?

Do you think this can be done with our CRD, any suggestions, any opinions, views, reviews, advice?

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2006 Liberty Limited CRD, Deep Beryl Green, Yeti tune, Arp studs, new cams, rockers, lifters, TB. "Green Monster"
2005 Liberty Sport CRD, Deep Beryl Green, GDE Hot Tune, ARP studs. "Rocket"
1982 Fiat 124 Spider Convertible. "Fiona"

For those people with an EGT probe tapped into the exhaust manifold this could be removed and the cleaner squirted in through that hole - if it is close enough to the turbo exhaust port. Of course if you start the engine with the probe out your going to get oven cleaner in your eyes or blown all over the place. The other possibility is to drop the dump pipe off the turbo exhaust fitting (it can be reached from below, but then you'll get oven cleaner dripping into your eyes from above).

I suppose that if this is proven to be a real maintenance need, and not just a crazy idea, that tapping near the turbo exhaust inlet and creating a permanent cleaner port (which would be sealed in normal use with a short bolt) might be a reasonable approach.

I have the EGT hole so I'd use that.

I would want to know what oven cleaner is going to do to the CAT?

Dodge has a service bulletin out for the 6.7 Cummins for cleaning the soot out of the turbo vanes, 11-001-08. Wonder if the same procedure would work here?

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2000 Dodge SLT 4x4 CTD Intense Blue, a few go fast goodys

2006 Limited CRD 4x4 Inferno Red, GDE ECO tune

Well I find it interesting that if this simple fix is viable, it may eliminate what could be a $2000.00 plus dealer repair job.

What is an EGT ?

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2006 Liberty Limited CRD, Deep Beryl Green, Yeti tune, Arp studs, new cams, rockers, lifters, TB. "Green Monster"
2005 Liberty Sport CRD, Deep Beryl Green, GDE Hot Tune, ARP studs. "Rocket"
1982 Fiat 124 Spider Convertible. "Fiona"

Exhaust gas temperature

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Solar Yellow 2001 TJ Sport 4.0 auto 4X4
White 2006 Liberty Limited 2.8 CRD 4X4...SOLD 4-21-2012

Found the problem, air leak at CCV hose. Turbo was sucking air.

Tell you what though, I sure have a clean turbo now that I flushed the crap out of it while flooring it up that hill.

The only bad thing about it is that I need to buy a new set of tires now. I wore down the rears.

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2006 Liberty Limited CRD, Deep Beryl Green, Yeti tune, Arp studs, new cams, rockers, lifters, TB. "Green Monster"
2005 Liberty Sport CRD, Deep Beryl Green, GDE Hot Tune, ARP studs. "Rocket"
1982 Fiat 124 Spider Convertible. "Fiona"

Interesting idea... And I'm with you on the "starting the engine would get cleaner in your eyes" bit. That would be REALLY bad for you. In my case, I put the port on the BOTTOM of the turbo, so it looks like if I wanted to do this, I need to pull the turbo anyway.

Blarg.

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Proud supporting vendor of LOST Jeeps
TRAVELING CRD TECH. I come to you!
Need help? Just ask! I've taken it apart more than most.
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Over 225 CRDs currently driving with my valves, timing belt, rockers, or ARP Studs.
Bad noises = REALLY bad things.