Re: Advice required XR6T
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I also think likely to be fuel related, most probably fuel pump and/or pickup.
Does it seem more prone to playing up when the fuel level is lower? From what you said in above post where you mentioned suspected bad fuel and towing a ski boat, I think it is mostly playing up at lower fuel levels.
You said you had the fuel system pressure tested, but what was really checked and how? The fuel pressure would really need to be monitored whilst driving under load on boost, to see what happens when the car plays up. The fuel pressure should rise with boost pressure, which means that the load on the fuel pump is highest under the combination of high load and high boost. Perhaps the fuel pump can keep up when not on boost but is struggling beyond that...
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