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 Alfa Romeo forum : Technical (156)
Subject Topic: EGR Valve Cleaning Post ReplyPost New Topic
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Alfa Ian
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Posted: 23 December 2005 at 16:48 | IP Logged Quote Alfa Ian

Right then this afternoon i attempted the cleaning.

First problem i couldn't remove it from the car. Managed to undo everything apart from the pipe underneath it. This been because the bolts were so tight there wasn't room to get any leverage.

Plan B removed the solenoid in situ and the pipe to the throttle body and clean what i can that way. Got the Gunk out and brushed it all in and wiped with a cloth. Managed to get respectably clean the parts i could get to.

Put it all back to together started the car to make sure it still worked. All fine so.

Need to take it for a good run now to see if any difference but not now.

I'll update with the test drive results.

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AndBurG
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Posted: 24 December 2005 at 11:04 | IP Logged Quote AndBurG

any update?

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Alfa Ian
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Posted: 24 December 2005 at 13:01 | IP Logged Quote Alfa Ian

Yes.

My first findings were that the car seemed much smoother through the revs and pick up from very low revs was much better.

However with regard to the engine management light coming on and power loss. No change.

I found with my car (before the clean) flooring it in third, power was fine up to about 2k then after that it felt like something was restricting it somehow. Basically didn't feel like it was suppose to. Now most of that is gone.

My conclusion is that the problems of the eng man light still unfixed however car runs much better, whether this is because i also cleaned the throttle body or it is a cleaner EGR valve i cannot say.

I would recommend the cleaning because when you get the bits off and see the black cr*p you know it is probably only a bad thing to have there.

Tip - The pipe between EGR and throttle body don't put your finger in it and turn. It has a razor sharp rim and sliced through my glove and finger in a second.

Also does anyone know what the bit of kit is under the thermostat on these JTD's? it's in the pipe between the turbo/exhaust manifold and the EGR valve.

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hutch
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Posted: 24 December 2005 at 14:12 | IP Logged Quote hutch

Alfa Ian wrote:
Yes.


Tip - The pipe between EGR and throttle body don't put your finger in it and turn. It has a razor sharp rim and sliced through my glove and finger in a second.



Now that is a tip to remember

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Posted: 24 December 2005 at 14:29 | IP Logged Quote hutch

Alfa Ian wrote:


Also does anyone know what the bit of kit is under the thermostat on these JTD's? it's in the pipe between the turbo/exhaust manifold and the EGR valve.





is it on this drawing ?

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Alfa Ian
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Posted: 26 December 2005 at 13:59 | IP Logged Quote Alfa Ian

Yes but it is to small to see the numbers.

It is the bit at the bottom of the picture next to the pipe which bends 90 degrees up.

Looks like a bit of an over sized pipe.

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David C
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Posted: 26 December 2005 at 14:05 | IP Logged Quote David C

Does it have the oil breather pipes connected to it?

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Posted: 26 December 2005 at 14:51 | IP Logged Quote hutch

its listed as a heat exchanger, but i have no ideafor what

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David C
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Posted: 26 December 2005 at 15:15 | IP Logged Quote David C

Engine coolant!
Just found the other half of the puzzle, the coolant lines from the oil/coolant heat exchanger run to that part of the EGR circuit and then on to the thermostat.

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Alfa Ian
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Posted: 26 December 2005 at 16:11 | IP Logged Quote Alfa Ian

Right so it's a heat exchange for heating the coolant or cooling the exhaust gas which is going to get reused in the combustion chamber?

Either way it is unlikely to be effecting engine performance.

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