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Question

How is the carbon build-up on the inside of the intake manifold cleaned? Note the the EGR valve is not removable from the manifold. What are the other associated parts that should also be cleaned on the inside? 1996 VW Passat, 1.9 L TDI, Engine AHU

Submitted: 132 days and 7 hours ago.
Category: VW
Value: $9
Status: CLOSED
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Optional Information

Year: 1996
Make: Volkswagen
Model: passat
Engine: 1.9 TDI

Already Tried:
scraping, but can't reach all aeras.

Posted by VWDoc 132 days and 7 hours ago.

Info Request

Have you removed the manifold completely?

132 days and 6 hours ago.

Reply

Yes the manifold has been remove and is in hand. What other componets need to be removed? I've heard that this carbon build-up is a problem for VW TDIs. The stuff is sticky and gooie.

Accepted Answer

You're going to need quite a bit of solvent, such as a brake cleaner, and a brass brush, much like a test tube brush, about 2" in diameter. Start softening up all of the buildup with the brake cleaner, and start using the brush after it's had a change to soak in for a few minutes. Be sure to cover up the ports on the cylinder head while you have the manifold off so nothing gets into them. Also make sure that any large chunks of buildup are completely out of the intake before you reinstall, so they don't get ingested. Smaller pieces will be burned during combustion. No, the intake does not have to be spotless inside. Make sure to use new gaskets.

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Expert: VWDoc
Pos. Feedback: 100.0 %
Accepts: 
Answered: 7/13/2009

VW Shop owner

20 years of experience working with VW's. Independent European shop owner and technician.

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