AndyW
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| posted on 15/8/12 at 05:11 PM |
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turbo diesel help please
Hi guys,
Ok, so my last post proved fruitless in my search for an answer. Hopefully this may provide an answer or at least a step in the right direction.
So, renault megane 2004 1.9dci.
New turbo fitted. Turbo spins when engine running, checked that tonight. When you drive and accelerate you can hear the turbo spin up, but there is no
boost. It drives like a non turbo diesel.
Any suggestions??
Thanks
Andy
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steve m
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| posted on 15/8/12 at 06:03 PM |
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Split hoses, or not connected hoses?
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owelly
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| posted on 15/8/12 at 06:17 PM |
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Not familiar with that particular car but a few suggestions:
Split or loose hoses.
Wastegate/bypass stuck open (various reasons why including a rogue signal from the ECU if it has one).
Split intercooler.
Gaskets popped out.
Air filter blocked/wet.
Cat converter collapsed blocking exhaust.
Is there any fault codes stored or pending?
http://www.ppcmag.co.uk
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AndyW
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| posted on 15/8/12 at 06:52 PM |
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no fault code stored.
Will check hoses but sure they are all ok, will double check.
As for a split intercooler, dont really know how to check that!!
Keep em coming guys!!!
Thanks
Andy
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Not Anumber
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| posted on 15/8/12 at 07:37 PM |
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EGR valve playing up can have that effect too leaving the car down on power but with the turbo still audible.
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perksy
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| posted on 15/8/12 at 07:47 PM |
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Compressions ok ?
Checked and double checked all the hoses ?
EGR valve ?
Have you checked the Live Data from the ECU ?
Diagnosed a bad throttle body on a new shaped Clio and no fault code was stored but by looking at the live data the throttle body trace was bloody
awful
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pmc_3
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| posted on 15/8/12 at 09:11 PM |
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The Laguna 1.9dci's are prone to split intercoolers
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AndyW
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| posted on 15/8/12 at 11:28 PM |
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I will be having another look tomorrow and if I find anything will post up. I still think it might be something to do with the vacuum but time will
tell. SWMBO is wanting her car back......
and I want to get on with building a kit car....
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Not Anumber
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| posted on 16/8/12 at 09:07 AM |
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Not sure about the approved way of leak testing an intercooler but i just took mine off and filled it with water, making very sure to dry it out
properley before refitting.
Have a serious look at the actuator for the EGR valve. This may be a seperate vacuum operated unit on the Laguna as it is on a number of cars cars.
If this is plying up it can have the effect of reduce engine power by a massive amount: The ECU thinks it has enabled the EGR so accordingly reduces
the flow through the air intake to compensate. Though the MAF on the air intake can see the reduced airflow the ECU can't work out whats going
on and doesn't have a way of compensating. You could try disconnecting the lead to the actuator to see whether the car runs any worse than it
already is. If it is runs the same then the chances are you have found the cause. Rather than replacing the actuator you can bypass it with a simple
circuit comprising two resisters and a diode. Worked a treat on mine and better MPG too.
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splitrivet
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| posted on 16/8/12 at 11:03 AM |
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I'd go for hoses, split intercooler or stuck wastegate especially if black smoke on load, try manually moving wastegate to see if it opens and
closes OK.
Cant see it being EGR if youve recently changed turbo unless it was doing the same previously and if it was your diagnosis was wrong, tried the mass
airflow sensor ?
Seems like everyone points towards the EGR with a diesel when sometimes its something as simple as a split hose.
Cheers,
Bob
I used to be a Werewolf but I'm alright nowwoooooooooooooo
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