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post #246 of (permalink) Old 16th September 2012
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Re: Renault Laguna II 1.9Dci - Engines - Hesitation Cured after EGR cleaned

Originally Posted by RobLagunaII View Post
My story so far - Driving up the M1 from London to Glasgow a few weeks back my 2002 1.9DCI Lag II started to loose power intermittently when running above 2000 RPM. The intermittent power loss was at regular intervals about every 10 to 15 seconds. It lasts a few seconds and is followed by a big puff of black smoke, I pulled in and called the RAC, after much tinkering we disconnected the MAF and the car ran OK, but a bit slow until the turbo cut in. Anyway when I got it home I read the posts on this thread, I've cleaned the ERG and ports but the problem came back when I reconnected MAF . So I replaced the MAF and still the problem persists. The only other odd thing about the car is that it make a slight hissing noise when the turbo is engaged. I've checked all the pipes I can see and all seems fine. Not sure what to do next and would welcome some advise.
I have spent the last couple of weeks trying to track down a hiss when the turbo is under load. Yesterday I dismantled and cleaned the EGR , which was a wee bit mucky, but not too bad.

Anyway, the turbo hiss got even louder under load and after a test drive/fuel run this afternoon I popped the bonnet and got the torch out. Immediately I spotted fresh oil on the EGR which was spotless. It was also obvious after further inspection that the oil was being blown out and ( turbo )airpressure had spread it. I hadn't noticed this in my earlier inspections when looking for the obviously split pipe, and of course I decided it was a knackered intercooler and / or turbo after reading the gloom on this forum .

So, I took the plastic intercooler to manifold pipe off at the manifold and inspected. There is a very neat split just beyond where the hose clip sits, on the intercooler side. This has been the cause of the hiss. So as a "temp" repair I bound the pipe with reinforced radiator hose repair tape and clamped the pipe back on with a wide hose repair clamp, the kind with a nut and bolt and which is about 2 inches wide.

I think that the pipe split was caused by the fractured rubber bobbin mount that holds both intercooler pipes to the block, which I have now replaced. Worth checking if yours is intact.


The car runs perfectly.
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2003 Laguna 2 1.9 DCi Initiale
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