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Low Speed Loss of Boost. Takes along time to buildup.Views : 1644 Replies : 16Users Viewing This Thread : |
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May 29th, 2021, 12:14 | #1 |
2004 XC90
Last Online: Nov 2nd, 2021 23:27
Join Date: Sep 2017
Location: Norwich
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Low Speed Loss of Boost. Takes along time to buildup.
Hi all,
My car is a 2004 XC90 with 170k on the clock. Over the last few weeks I've had a 'Engine Service Required' Message pop up. Sometimes it'll clear if we're travelling along (Dual Carriage way speeds), but if at low speeds it'll hang around requiring a stop, engine off and back on to clear it. There is no black smoke emitted from the exhaust. MPG is its normal 29mpg. The fault code is generic on a handheld reader, P0244 "Turbocharger". The last state it failed in was:
A Genuine Volvo Fuel filter was fitted in 2020. Along with yearly oil changes and Genuine filter. The oil i used was Castrol Edge 5w-30, which now after digging away in the forums is probably incorrect and will be changed out for the 0w-30. The intercooler was replaced by myself in 2019 as it was cracked and leaking oil. The result of the crack has probably lined the intake system with gunk In the last few days the car now has zero boost from a standing start, pulling out of junctions requires some forward planning, the boost will slowly pick up and we're away. Driving along the road and increasing the speed doesn't produce the same effect, everything in the terms of boost is normal (which fairly slow as it's only 163bhp lol) I've investigated the Vacuum system, I get that popping noise I hear a lot about, but no matter if I blank off the Brake Booster and Nipple at the pump to the rest of the system, it'll still pop away. The Needle on my reader will not bounce around at idle and pulling a vacuum shows the tiniest of leaks on the engine mounts. 5Hg over a minute. The interesting bit is when I rev the engine up the needle will bounce everywhere, it's tee'd into the system straight after the pump, and this point I'm thinking how can things work if it can't pull a good vacuum. On the second go a short while later, when I rev the engine its build up more vacuum and hold releasing when the waste gate releases, quickly builds up and holds. I recorded this one and linked it here: https://youtu.be/CL8nBxZC5rk This leads me to think that something is effecting the vacuum intermittently, any ideas on what this could be? Moving my thoughts away from that, the car does a lot of short runs for School, would it be possible the Turbo Vanes are full of build up that needs cleaning? I'm going to run some Turbo cleaner through the fuel system to see if that'll make any difference. Maybe the actuator on the turbo is sticking and causing a boost leak? Cleaning of the MAP sensor would probably be beneficial. Can anyone recommend anything else I could try or clean before taking it to a specialist or dealer for diagnostics. Many thanks in advance Last edited by tomkirkland; May 29th, 2021 at 13:45. |
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