Loss of manifold pressure under acceleration xf 2012 3.0d
Discussion
Hi, I have a 2012 model 3.0D xf. Yesterday, I approached an island at speed and accelerated hard out of the island. That was the point I heard a loud bang and gush of air. Thinking it was a blowout, I pulled over, but all looked good.
Pulling away though, as soon as the turbo kicked in, there was a popping sound and gush of air, followed by loss of power.
Under 3000 revs, the car drives normally. No errors. No restricted mode. Just under heavy acceleration, pop and whoosh.
I looked for a popped off hose or split hose, but nothing obvious. Trying again today, the turbo does seem to build pressure, but reaches a level where all pressure is suddenly released.
Hopefully, attaching the torque logging will show the manifold pressure climb with heavy acceleration, but suddenly drop pressure at around 2500 revs. Any ideas where the problem may lie?
Pulling away though, as soon as the turbo kicked in, there was a popping sound and gush of air, followed by loss of power.
Under 3000 revs, the car drives normally. No errors. No restricted mode. Just under heavy acceleration, pop and whoosh.
I looked for a popped off hose or split hose, but nothing obvious. Trying again today, the turbo does seem to build pressure, but reaches a level where all pressure is suddenly released.
Hopefully, attaching the torque logging will show the manifold pressure climb with heavy acceleration, but suddenly drop pressure at around 2500 revs. Any ideas where the problem may lie?
I'm open to it being a cracked intercooler, but it doesn't seem to match the historic symptoms. The engine idles without issue, performance is normal without boost , there are no restricted performance warnings.
Pulling away normally, there are no issues. Manually holding onto a gear, the engine will keep going up to red line with no impact to engine sound or performance. It is just under heavy acceleration, the turbos kick in at 2000 but almost immediately after, there is a sudden release of air and boost pressure drops, but no warnings or restricted performance. If you keep your foot down, the power loss remains, but lifting the accelerator appears to reset and you can put your foot to the floor again to the same effect. It starts to build pressure, but seems to immediately vent it.
It is in for diagnostics tomorrow. I'm hoping for a split hose, or waste gate fault, but braced for a complete set of intake manifolds.
Pulling away normally, there are no issues. Manually holding onto a gear, the engine will keep going up to red line with no impact to engine sound or performance. It is just under heavy acceleration, the turbos kick in at 2000 but almost immediately after, there is a sudden release of air and boost pressure drops, but no warnings or restricted performance. If you keep your foot down, the power loss remains, but lifting the accelerator appears to reset and you can put your foot to the floor again to the same effect. It starts to build pressure, but seems to immediately vent it.
It is in for diagnostics tomorrow. I'm hoping for a split hose, or waste gate fault, but braced for a complete set of intake manifolds.
Had this in my dads XJ. ZS soon as it got time for the turbos to kick in bang restricted performance. I managed to limp it back to Barry in South Wales which was interesting to put it lightlly! Swapped it for my then BMW 330D as we were supposed to be on a ferry that night! We made it just in time for the ferry the next day
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