EGR valve (how to know if it is clogged?): | Vel Satis Questions | Vel Satis Forum

 
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EGR valve (how to know if it is clogged?):

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21:22
March 11, 2011


Vel Haggis

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Post edited 21:23 – March 11, 2011 by Vel Haggis


Hi,

amongst the other teething issues with our Vel Satis, one thing I am noticing is that it feels down on power and I cannot get anywhere near the fuel economy figures I expected.

Today when joining a main carriageway from a sliproad, the main road is up a long hill so I decided to leave it in 3rd and stick my boot down. The car would not accelerate beyond about 4k rpm and the cloud of soot coming out of the back for a distance of over 200 metres was reminiscent of Dick Dastardly in Wacky Races!

I have previously had a 2.5tdi Volvo 850 and in a similar test it would've been doing about 70 at the top of the hill without the smog trail continuing much beyond 50 metres.

Does anyone have similar experiences of excessive soot / poor power / fuel economy?

23:13
March 12, 2011


R9UKE

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Unfortunately I do…it's only one possibility, but you won't like it.  Turbo failure.

I bought my last Vel Satis as a victim of this common Renault weakness.  It was well past this stage and was undriveable, because as soon as the turbo would kick in, it would shoot all of it's oil out of the exhaust and rev itself to self-destruction.  Could only be stopped by putting it into sixth and stalling it!  The turbo was replaced with one from a scrapped Laguna 2.2 dCi.  I myself don't think this turbo was 100%, hence why I ended up selling the car at auction.  It had exactly these symptons.  Fuel economy was poor, and if pushed hard I could be followed by the cloud of pollution. 

But again, it was never diagnosed, and I never investigated it.  Plus… I didn't drive the car pre turbo failure to compare.

It's just one possibility, I've heard of 1.9 dCi engines doing this before the inevitable happens.

I have no experience of dealing with the EGR or anything so this is definitely worth investigating before getting into a panic.

Keep us updated!

10:02
March 15, 2011


Vel Haggis

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Thanks R9 (I think!)

I decided to try the old "kill or cure" method and see if the engine simply needed a good strong burn, in case it had been driven in a pedestrian manner and had become clogged.

Turning onto the motorway last night on the way home, I booted it up the slip ramp and stayed in 3rd for a couple of miles, getting up to about 65mph. The black smoke subsided and there were no obvious ill effects. On a later journey I approached the same hill that started my concern and did the same thing. Again, less black smoke and the engine revved cleanly up to 4500rpm (wouldn't redline, but it is a fairly long steep hill).

Not sure if that is significant?

The "whine" from the turbo isn't majorly loud or intrusive, it cuts in at about 1500 rpm and by the time you get up near 3000 it has either gone, or is drowned out by the engine noise (which isn't excessive). I would describe it as an old 1970's analogue synth tone. It sounds a bit like old cars with badly surpressed distributors, which would create a whistle / whine interference on the car radio.

 

I've registered on the Parkers.co.uk forum as there is a 48 page long thread there about blown renault turbo diesels. No responses as of yet.

10:06
March 15, 2011


Team

UK

Admin

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If the black smoke seems to have lessened after booting the accelerator pedal and giving it the beans, maybe your turbo isn't on the way out, nor your EGR, and the car had just become clogged, as you mentioned.

Perhaps give it a regular flooring, once a week, as a clean-out measure, and see if the smoke is consistently less, week after week?

If it's any consolation one of our founders' 3.0 automatics has had a turbo whistle for over a year now, with no ill effects, so maybe your whine/whilstle can be lived with?

Vel-Satis.org Chief Administrator & Founder

10:17
March 15, 2011


Vel Haggis

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R9UKE said:

Could only be stopped by putting it into sixth and stalling it! 


From the Parkers forum thread, there is apparently a safety cut out which for some "legal" reason, Renault don't mention in the handbook. Pressing the stop button 5 times in quick succession is alleged to cut off the air to the engine and stop it.

Might save a shattered flywheel / clutch if you try and stall it on an older car in that situation?

22:37
March 15, 2011


R9UKE

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Vel Haggis said:

R9UKE said:

Could only be stopped by putting it into sixth and stalling it! 


From the Parkers forum thread, there is apparently a safety cut out which for some "legal" reason, Renault don't mention in the handbook. Pressing the stop button 5 times in quick succession is alleged to cut off the air to the engine and stop it.

Might save a shattered flywheel / clutch if you try and stall it on an older car in that situation?


Well with dCi Renaults dropping like flies at the minute, this feature needs to become more well-known.  Thanks for that, I didn't know about it.  I have plenty of turbo failure stories to tell of.  EVERY single person I know with a dCi has ended up at the side of the road in a cloud of smoke.  My uncle has some hilarious stories.  His department at work got a fleet of 5 Laguna 1.9 dCis.  4 of them failed spectacularly.  One female colleague of his completely panicked (understandable if you don't know much about cars), when her Laguna lost power then revved itself uncontrollably to 4,500 rpm.  She literally got out and ran, leaving the Lag in a cloud of it's own smoke and oil.  Needless to say, the engine killed itself and they all now drive Insignias.

No, your symptoms don't sound like turbo failure (phew!).  The smoke would be persistant, and obvious from the second the turbo kicks in.  Just put it down to a characterful diesel puff Smile

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