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Home > Technical > P0299 - Underboost |
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Nodge68 Member Since: 15 Jul 2020 Location: Newquay Posts: 2071 |
I'm guessing the turbo boost control actuator is sticking, when being held in one position for an extended time. Although this would only be relevant once on the M5, as the A30 is pretty hilly, requiring more boost to maintain speed. Hyundai Ioniq 5 Ultimate. The family car.
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5th Mar 2022 6:12 am |
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Badger51 Member Since: 01 Mar 2014 Location: Coffs Harbour Posts: 959 |
As Nodge68 has already suggested, sticky turbo vanes/actuator, or even split intercooler hose or cracked intercooler.
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5th Mar 2022 7:33 am |
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jules Member Since: 13 Dec 2007 Location: The Wilds of Warwickshire Posts: 4954 |
JLR workshop manual specifically mentions lubricating the turbo vanes actuator crank with LR029042 high temp grease. It also indicates that the crank must be disconnected from the electronic controller before manually moving the actuator crank and vanes through the whole range of movement multiple times to remove the soot deposits.
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5th Mar 2022 9:14 am |
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hamiltov Member Since: 08 Jan 2020 Location: Nottingham Posts: 22 |
Well informed responses straight away. This forum is a treasure. It does all add up to sticky turbo vanes/actuator as the M5 drive would have left it static for a fair while. I dare not tackle the actuator myself but will get hold of the recommended lubricant and instruct my local garage along with another couple of jobs I need doing. Fingers crossed! |
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5th Mar 2022 10:00 am |
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Grey Member Since: 25 May 2022 Location: Beroun Posts: 2 |
Hi All
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25th May 2022 7:39 pm |
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hamiltov Member Since: 08 Jan 2020 Location: Nottingham Posts: 22 |
Hi,
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25th May 2022 8:29 pm |
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DEG5Y Member Since: 22 Jul 2016 Location: Widnes Posts: 162 |
My turbo went belly up, so I had it changed (Ouch!) after I was getting over boost and then underboost warnings. Turned out to be a faulty 'new' turbo from LandRover. So, have you had a new Trubo? |
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28th May 2022 3:04 pm |
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Beaubererece Member Since: 21 May 2020 Location: Bucharest Posts: 2 |
Hello,
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8th Nov 2022 6:52 pm |
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