How to clean EGR and inlet manifold

[Andy_with_a_screwdriver]

Originally Posted by klarzy

if its blocked you will notice the difference when you clean it...

And notice even more when you drive it after it is cleaned, engine will accelerate far more freely. Mine felt like it had about another 20bhp to play with.

[bl52krz]

Originally Posted by HarryM1BYT

I think floored meant flawed?

In which case I very much agree with you, but maybe for different reasons. In my view, EGR as a technology are fine and work well when the vehicle is new. Problem is that they are at best described as a botch, a poor workaround.

In use they all choke up with carbon and there is no requirement for cleaning, so after a few years they, the manifold and the inlets become choked with carbon build up. The build up very obviously worsens the emissions, so they are self defeating.

I would imagine that the inlet valve stems take a bit of a battering with all the mulluk that must get through to them from the egr.

[HarryM1BYT]

Originally Posted by bl52krz

I would imagine that the inlet valve stems take a bit of a battering with all the mulluk that must get through to them from the egr.

I agree, but how could they be cleaned properly, without a major amount of disassembly?

I took my EGR off, cleaned that, but found it was only lightly coated. That probably suggest my car has not spent much time running at low speeds, so I just took the manifold off and gave it a quick/ less than thorough internal clean out. I cleaned as much of the valve stems as I could get to using a vacuum to suck the dislodged carbon out. I then installed an EGR bypass. In my ownership since then, it has spent most of its time working hard, which is generally good for diesels.

[Arctic]

I cleaned out four manifolds this weekend starting on a Friday by removing the EGR, MAP sensors, and rubber seals.

Then scrapped out as much gunk as i could from each manifold, then it was sprayed with oven cleaner and engine degreaser they ere then left over night ready to finish cleaning out on the Saturday.

There must lots of owners running around with clogged up manifolds stopping the engine from breathing proper.

All have differing amounts of gunk in them some that just trickles out when scrapped off the internal ports,1

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A lot of owners add bypass EGR thinking that will help, but in fact all it is doing is hiding the trouble in the manifold that as already occurred, and needs dealing with for the engine to breath properly.

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It took me 5 hours to scrape out all the gunk from these manifolds, even then there is still quite a bit that is hard to reach which the oven cleaner and engine degreaser soaking over night will loosen, ready for the jet washing of the manifolds.

Some of the tools i use and always wear thick rubber gloves this muck get everywhere, it will ruin your clothes if you get it on them.
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Jet washing took place though out Saturday which took another 5-6hrs.

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Ready to have the clean EGR and MAP sensors fitted, some will have an original gutted EGR others just the EGR not touched.
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First one sorted ready to befitted on a local car at the Nano in Oct 3rd
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All four re-built and also ready for the meet.
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I must say i was pleased with the out come
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If you are going to the Nano meet and would like a swap out of your manifold EGR, MAP sensor then drop me a PM Arctic.