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post #26 of 29 (permalink) Old 31st July 2010
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Re: Whistling noise on my Renault Megane DCI

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post #27 of 29 (permalink) Old 31st July 2010
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Re: Whistling noise on my Renault Megane DCI

Originally Posted by clios-are-well-fast View Post
accelerate out of control?????
get some fact about turbos before you try to sound smart and clever.
Hi Clios-are-well-fast.

If you read the title of this thread you will clearly see it relates to a turbo charged diesel engine not a petrol engine.

Whilst some of what you say may be true of petrol engines the same cannot be said of diesels. On Renault engines the turbos are both lubricated and cooled by the engine oil feed system. Should the turbo seals and/or bearings fail oil will be pumped into the inlet manifold. As diesels use compression (not an ignition spark) to ignite its fuel then the engine will run on its own lube oil . Better still diesels don't have throttles in the conventional sense and are known as free-air breathers so taking you foot of the accelerator makes no difference whatsoever. As diesel engine are free-breathers then as long as they get unregulated fuel (be it diesel or lube oil ) the revs wiull continue to rise unabated or the engine self destructs.
And as already said the only way of stopping the engine is to stall it. Many many motorists have suffered this problem and not just Renaults by the way.

I would politely suggest before being critcial of posts or wrongly accusing forum members of being smart and clever (I quote your own words by the way) I suggest you do some research on how diesel engines and their turbos operate.
It's never to late to learn and members of the forum would gladly offer advice and knowledge as long as they are not being insulted. In other words don't bite the hand that may feed you.
We are a friendly well mannered bunch and welcome positive contributions made in a knowledgeable and friendly manner. On the other hand we don't tolerate bull**** either.

Oh by the way I have been driving and working at turbo diesels for 15 years or more.:loser:
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post #28 of 29 (permalink) Old 31st July 2010
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Re: Whistling noise on my Renault Megane DCI

Nice on Noel I only wish I had all of the knowledge. I had been googling turbo failures and noticed that turbo 's that share the engine oil had the problem of being unable to stop the engine other than to stall it.

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post #29 of 29 (permalink) Old 16th February 2013
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Question Re: Whistling noise on my Renault Megane DCI

Hi, I have a megane 1.5 dci and a few weeks ago i hit a large pothole, not sure if its related but since then, when i am reaching a speed of around 70 mph, the check injection light comes on and the car goes into limp mode.
I had a diagnostic done which pointed to the air flow meter, so i replaced it (with a second hand one) i was told to remove and clean the EGR valve with brake cleaner at the same time, which i did, but it didn't solve the problem. Instead i noticed a noise start coming from the engine when i accelerated, a kind of whistling or whining not sure how else to describe it?
Had diagnostic done again by renault in wolverhampton and they said it was the boost control valve, so i replaced this (again second hand) but it did not solve it either, had another diagnostic telling me its to do with the air intake so tried a second hand EGR valve. But i am still getting check injection light coming on at around 70 - 90 mph ( only going at these speeds to check if it still comes on) and i am still getting the whistling noise when accelerating, its only when the revs get quite high though, when i go gently it doesn't do it. i have had a visual inspection of the turbo and pipes made by a mechanic friend of mine and they looked ok.
so now i am getting to the point where i am running out of ideas, and while hoping it to be something simple, i am bracing myself to expect the turbo to need replacing. car runs ok otherwise with no loss of power, it still pulls as it did before.
in the meantime i still need the car and i am taking it easy when driving so i don't overwork it.
any input would be greatly appreciated!
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Last edited by toznlara; 16th February 2013 at 07:33 PM. Reason: missed info
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dci , megane , noise , renault , whistling

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