#11
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I think you are talking about anti shudder valve. It only has two positions open and closed, it does not participate in airflow regulation, just cuts air supply when you turn ignition off so that you have smoother engine stop as it does not have to compress air in cylinders. Added benefit is that it eliminates possible engine run away.
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Currently 8less 2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D 8 history: 2006 A8 Sport 4.2TDI quattro SOLD, 1997 S8, reached end of life with gearbox failure |
#12
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Hey great info cheers,I wish I had VCDS to test it to be honest to test it, it could be my imagination but does seem to be a small improvement, however like you say it could be compensating for this restriction. I agree a full blank might be a good test even if it does put the EML light on the plates only £3 worth a stab, I know a more permanent solution would be mapping it out just thought I'd give it a go
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#13
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Hey mate, yes the manifold muck concerned me , its like feeding the engine its own poop, I am temped as well to clean the intake manifold but It looks very mess and the Mrs would go off it! I might ask local garage how much it would be to clean
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#14
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I am but it is variable and is also for EGR assistance as described in the SSP...
Attachment 19873 Last edited by snapdragon; 23rd April 2020 at 08:18 AM. |
#15
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Ahh.. must be an update on newer cars, looks like it's electric driven. Older engines just had vacuum operated on/off valve.
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Currently 8less 2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D 8 history: 2006 A8 Sport 4.2TDI quattro SOLD, 1997 S8, reached end of life with gearbox failure |
#16
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Don't suppose if you know if removing the upper intake manifold it just slips out after unbolting? Was thinking of giving it a good cleaning, I hope its that easy, I really do
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#17
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Some of the screws are long, some short, so mark with a paint pen or some other way of remembering. The lower intakes were the really sooty ones, as well as the ports in the head, some were about 75% blocked. I used the pressure washer on the removed plastic parts and sticky stuff remover and a roll of paper towel on the heads, a lot of carbon fell in but I was careful not too much liquid went in. Used original gaskets the first time they were in good shape, and new ones the second time. Didn't notice any difference whatsover in mpg or performance afterwards |
#18
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Cheers, snapdragon great advice I will definately take some photos/markings wouldn't have thought of doing that I'm not that clever usually , that what I was worried about removing the fuel pipes, vacuum pipes and wires it looked scary. I was thinking about over cleaner and pressure washing the upper manifold and leaving to dry. Lower I wasn't sure how to deal with but the paper towels might be an option. No noticeable performance increase damn! It's making me think is it worth doing haha
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