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Discussion Starter #1
Hi all, having posted problems about loss of power and black smoke my local fords now have a new view on this and could do with some advice on it. Having had the egr valve replaced,air mass replaced and a cracked pipe on the turbo replaced they now seem to think that it needs a new turbo boost valve. This is the latest and only fault code appearing on the system? What I would like to know before doing anything is would a broken turbo boost valve cause such problems as loss of power and black smoke? Or is it just another way of my local frauds trying to make more money out of my misfortune? Comments very welcome as got til tuesday to decide..... thanks
 

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Is that the 1.6, 1.8 or 2L diesel
I don't know about the 1.8 but the 1.6 should have a variable vane compressor where the vanes are moved by vacuum that increases with engine speed and thus reduces the boost
It cab do this becuase it has a smaller pulle so "spins up" at lower engine speed
 

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Hi Richard, its a 1.6 tdci..sorry but not all that clued up on diesel engines as have been petrol all my driving life!!So from what you are saying if they replace the valve i should have a nice smooth running c-max to start enjoying?? With hardly no black smoke and hopefully no creep mode?? Regards,Ian..
 

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Ian
The turbo on the 1.6 does not have a valve (Wastegate) in the sense you are alluding to.
The amount of "puff" it puts out (per revolution of the turbo) as the engine speed rises is reduced by altering the angle of the vanes in the compressor itself. If I remember correctly this is done by the use of vacuum to move the vanes and controlled by a valve which itself is controlled from the ECU. This could be the one they are referring to. Again if I remember correctly this valve is controlled by a manifold pressure sensor that compares the inlet manifold pressure(effectively the boost) with what is in the ECU control map for that engine speed and throttle position based on the sensor on the accelerator pedal

Perhaps you might get Fraud to explain what their reasoning is for this valve (whichever it is) to need changing and if they are not fully confident as to the why then .....
Do you have a independent Diesel Injection specialist (Bosch) anywhere near you that Fraud could sent it to?
 

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Discussion Starter #6
Update from frauds!! I now have my cmax back but am still none the wiser!! Turns out my local frauds was looking on ford bulliten site to try and get ideas on how to solve my problem with the car!! Yes ,what an absolute joke!! Can't figure it out so look on the web? Cowboys or what. Turns out there was no fault code for turbo valve,just them clutching at straws! So I'm going to a diesel injection specialist soon and told frauds were they can poke any future service from me!! So if you live in herts and want people who know how to look at a car and not just go on the web and try and pull your pants down don't go to my local frauds!!!!!!!!!!!!
 
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