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Discussion Starter #1
Hi
I'm thinking about buying new diesel Modus...however I found ...
The following report at HonestJohn web site in connection with Renault diesels..

On 1.5DCIs EGR should open to allow carbon dioxide, (which acts as a cooling gas) into the combustion chambers when the engine is under load (>30% boost). This allows the combustion chamber temperature to drop and thus the temperature of the exhaust gases.
If it sticks in the closed position the exhaust gas temperature will rise causing
a) the turbo bearings to fail and
b) introduce engine oil into the induction system.
This can cause the engine to run on its crankcase oil until it is either stalled or goes bang.

Problems with EGR valves in Renault dCi engines are also the cause of rough running when the valve is stuck in the open position. In several cases turbos have blown but the EGR valve has not been replaced. Inevitably the new turbo unit will not last long.

Any feedback from members?
 

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Yes some Members have covered high mileages with no ill effects, But service intervals are the important issue, Also if buying used the vehicle needs to have a very extensive warranty.

Regards

Ottoman
 

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6,475 Posts
The 1.9 was the real troublemaker in this department. Things have improved radically since Renault started speccing a higher grade oil, though they've now lowered the service interval too.

The worst case scenario is a nasty one: The engine runs with no restriction (at extremely high RPM's) on its own engine oil until it siezes, though if you have a manual transmission and are prepared for the problem, then deliberately stalling the engine will save it. Obviously you'd still need to get the cause of the problem sorted (probably a new turbo and EGR at that point) but at least you won't need a whole new engine. As this problem has been a lot more common than it should be, Renault will often make a large contribution towards the cost of repairs.

The EGR problem may be unusual to Renault, but the problem of the engine destroying itself in this manner is far from unique to the brand. I've heard of very similar problems with BMW and Land Rover diesel engines. I have no doubt that there are others.

One further thought: If you're doing mostly urban mileage, then avoid diesel engines with the FAP filter. The filter clogs up over time and needs a good long blast of high speed driving every now and again to clear it. The dealer should explain this to you when you buy the car, but a lot of them don't bother.
 

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Completely agree, turbo units share the same oil from the sump as the engine does, it is absolutely imperative that good quality oil is used, that it is changed at regular (more realistic) intervals than Renault originally quoted, and that after a long hard run, that the engine is given a few minutes idling to 'cool' the turbo off.

Every car has its problems, and although the honest john site is very useful, it can paint a real 'doom & gloom' picture of every car on the market. Think about it - how many owners will feel driven to enthuse about their car?

Plus, the difference with these types of forums (compared with ours), is that 'we' will see a problem through to conclusion, rather than just saying "there's a problem with this/that" and leave it there.

Have a good read of this forum, and make up your own mind whether to go ahead or not.

All the best,

Paul:)
 
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