![]() | Home > Technical (L322) > Restricted Performance Fault TDV8 4.4 - 1750 rpm on Motorway |
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Dave lincs Member Since: 31 Dec 2021 Location: louth Posts: 39 ![]() ![]() |
Same here as well |
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mjdronfield Member Since: 04 Nov 2011 Location: Derbyshire Posts: 7877 ![]() ![]() ![]() |
I wonder if having the cruise on alters what gear it might be in, or will drop early on an incline where you wouldn’t normally?
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mjdronfield Member Since: 04 Nov 2011 Location: Derbyshire Posts: 7877 ![]() ![]() ![]() |
And the 3.6 would be in 6th….
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JayGee Member Since: 27 Jul 2021 Location: London Posts: 3283 ![]() ![]() ![]() |
The OP said ‘top’. Also no paddles on the 3.6 unless they have been added as a modification. 2012 TDV8 Vogue (L322) |
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mjdronfield Member Since: 04 Nov 2011 Location: Derbyshire Posts: 7877 ![]() ![]() ![]() |
Ah, apologies. Not read it all. Trouble when replying when at work 🤣.
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Mike Edwards Member Since: 13 Feb 2021 Location: Northampton Posts: 226 ![]() ![]() ![]() |
Suspect you guys are heading down the wrong road.
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JayGee Member Since: 27 Jul 2021 Location: London Posts: 3283 ![]() ![]() ![]() |
OK thanks for the clarification but 1600rpm still seems high for that speed - can you confirm you are running stock 255/50 tyres on your 20" wheels? Listening to the sound of your engine in the other thread I'd be looking at this as a priority for a restricted performance warning possible cause. 2012 TDV8 Vogue (L322) |
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Discotigger Member Since: 12 Feb 2013 Location: Cumbria Posts: 804 ![]() ![]() ![]() |
Have you had a look at the 4 rubber hoses that go into the Intake Plenum, the large plastic 'donut' that sits underneath the big plastic engine cover. It's possible you have a minor split on one or more of the hoses that is allowing a little bit of air to escape from the intake, causing higher revs due to loss of turbo boost.
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JayGee Member Since: 27 Jul 2021 Location: London Posts: 3283 ![]() ![]() ![]() |
Loss of turbo boost won't change the revs vs road speed ratio as these are mechanically locked (assuming the TC is not slipping) 2012 TDV8 Vogue (L322) |
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Mike Edwards Member Since: 13 Feb 2021 Location: Northampton Posts: 226 ![]() ![]() ![]() |
The noisy engine is a different vehicle. Nothing has changed tyre wise for quite a few months. |
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Mike Edwards Member Since: 13 Feb 2021 Location: Northampton Posts: 226 ![]() ![]() ![]() |
After a period where I wasn't getting any error codes I'm now getting the usual set, i.e. manifold absolute pressure and turbocharger boost pressure low. |
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