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post #1 of 7 (permalink) Old 18th February 2007 Thread Starter
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pre modus investigaton

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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post #2 of 7 (permalink) Old 18th February 2007
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Hello & Welcome to the Forums

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post #3 of 7 (permalink) Old 19th February 2007
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welcome to the forums. There was a problem with DCi engines as a troll through the forum will show. However this affected engines from a certain manufacter period and the newer models seem ok. This was also compounded by too high service intervals. What age car are you looking at.
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post #4 of 7 (permalink) Old 19th February 2007
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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.


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post #5 of 7 (permalink) Old 19th February 2007
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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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Last edited by Horatio; 19th February 2007 at 08:24 AM.
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