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large air inlet pipe came adrift where flexible hose joins fixed plastic pipe, car smoked very badly. Pipe reconnected with original jubilee clip but has since come adrift twice more. Is this a build up of pressure somewhere or just a bad connection?
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It could be that the vanes in the vnt turbo have become clogged up with carbon causing the boost pressure to become too high ...although i would expect the control system to detect this and put the engine into limp home mode. Could be that the engine is rocking around too much ..engine mounts?? or the pipe is too oily/ clip needs to be tightened more.
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many thanks for your suggestions dieselhead. I will test them out. Is it a DIY job to check out the vanes on the booster to see if they are clogged with carbon?
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hi I presume this Renault uses a vnt garrett turbo. Might be best to get a check done at a renault dealer as a code fault code may have been logged if the pressure has exceeded specification.
You really need a ramp to get under the car then it's a case of checking that the turbo actuator will move between it's stops smoothly (firm thumb pressure should be enough). If the vanes stick in the 'aggressive position' then the pressure is going to rise over 2 bar at high revs and that could blow a hose off. If it's not sticking the fault could be caused by a fault in the control system.
As a rough check you can watch the offending hose when the engine is revved hard you might be able to see how much it 'balloons' which can indicate excessive pressure build up.
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