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There is a very loud hissing noise coming from back of turbo on my 2005 Laguna 1.9dci & engine has no power what so ever I've cleaned egr valve & checked hoses & its still the same
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I would get berryman and sea foam and do an induction cleaning on the intake. It sounds like running low quality fuel may have caused the intake manifold to get gummed up causing low flow through the egr valve.
Josh, your catalytic converter is shot (plugged). This caused a back-up of exhaust into the egr system. Probably melted the flexible tubing to the sensor, and may have damaged the sensor and/or the egr valve itself. The hissing you heard was the exhaust venting from the egr system. The converter being plugged caused you to lose power until the exhaust found a way out of the engine via the egr system...
Clean air filter, fuel filter and turbo filter. Check the inlet and outlet manifolds incl. EGR valve and Turbo gate. If there is particle filter then may be it is clogged. If its a diesel then open the injectors and clean it.
Hi Without seeing exactly what your looking at ,you need to try and find the vacumn pipes going to the control valve and carefully lok to see they are conected and that there are no splits in the pipes,if the pipes and mechanically sound then you probably have a fault valve,try running your finger around the valve to see if the hissing noise changes.
Hope this helps
Darren DCS BristolLtd Master tech
Try the relays under the bonnet fuse box 4 small black ones in a line, the first 2 from top cut of the fuel pump, and are a renowned cause of 85% of cranking without starting faults on the dci engine swap them over for the bottom 2 . If it starts, buy 2 from Renault and fit if the engine still fails to start the egr valve may be stuck closed starving the engine of air, its on the top of the engine at the air intake and has 3 bolts, remove it and clean it with carb cleaner then check its condition, if it appears ok, replace the cleaned one, if not you need a new one or the turbo will blow its seals and the engine will rev and burn on the engines own oil. beyond this and your diy fixes are at an end without a obd2 code reader.
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