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XC90 '02–'15 General Forum for the P2-platform XC90 model |
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Boost pressure sensor?Views : 9777 Replies : 25Users Viewing This Thread : |
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Dec 10th, 2017, 13:23 | #11 |
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After watching a you tube video , where the engine mount pipe is removed from the control valve(just in front of air box) They say that you will have vacuum at that point on tickover , but when the revs rise above 1k it dumps the vacuum to the mounts ? I have put on a vacuum guage on the valve and when I start the engine the vacuum rate slowly rises and when I Rev the engine the vacuum remains . When I turn of the engine it takes 3-4 mins for the vacuum to drop. Would anything else cause this ? And can it be bypassed to try it?
Cheers Phil |
Dec 10th, 2017, 14:41 | #12 |
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Ok , cancel the last post, turns out my guage was faulty, tried another and the vacuum control valve seems to be working as it should. I have ordered a hand pump vacuum tester so I can check pipes ect for splits or holes
Cheers Phil |
Dec 10th, 2017, 15:00 | #13 |
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When you get the test pump, attach it to the tube that goes directly to the turbo VNT actuator, after the TCV. As you apply vacuum, the actuator should move freely, about 5cm. If it does not move or it sticks, then you probably have a failed actuator or coked-up VNT vanes.
VIDA is really useful here, you can operate the VNT directly.
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Greg Last edited by gmonag; Dec 10th, 2017 at 17:11. |
Dec 10th, 2017, 15:15 | #14 |
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Thanks Greg,
Hopefully I will have it Wednesday so can get looking / testing then, if that fails then I will just have to try to get to Kendal to main dealers. So if I do start it up and immediately keep revs above tickover ,it will Rev cleanly and redline and runs fine, with no smoke or roughness, would that still indicate a turbo fault? Many thanks Phil |
Dec 10th, 2017, 15:59 | #15 |
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I can't say. I'm only trying to give some direction for the diagnosis.
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Greg |
Dec 10th, 2017, 16:21 | #16 |
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I know and your input is greatly appreciated.
Cheers Phil |
Dec 11th, 2017, 19:31 | #17 |
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Just a quick update, removed belly pan tonight and had a good look underneath, no signs of leaking boost , pipe work seams fine, although my set up didn't have any sealing rings/washers between the under belly pipe and the turbo flexi pipe as surgested , the flexi pipe has a yellow nitrile type liner? Just waiting for my vacuum tester to test the pipe work and actuator . When I got back in the car I scanned the faults again and had the same fault , boost pressure sensor, I cleared the fault with ignition on but engine not running, and message disappeared,but after 30 seconds it threw the fault up again without the engine running. Is this pointing to the sensor? as surely anything to do with the vacuum /boost side would need the engine running to establish a fault?
Cheers Phil |
Dec 11th, 2017, 19:37 | #18 | |
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Quote:
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Dec 11th, 2017, 20:40 | #19 |
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Sorry Clan,
I'm not sure of what or where I should be testing or what I should be testing them with? Can you elaborate please Many thanks Phil |
Dec 11th, 2017, 20:54 | #20 | |
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for example: boost pressure inlet manifold pressure exhaust manifold pressure atmospheric pressure it depends on different models and years , they should all read atmospheric pressure and read very close to each other , one will probably be more out than the rest and it is always the boost pressure sensor in the intercooler pipe . Atmospheric pressure varies around 1000 mb
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