Acceleration issues

Hi guys my name is Tony I’m new to this forum and I’m hoping you guys could help me with my 2007 TDV8 Vogue SE, I drove this vehicle down from Chester to Kent with no major issues on the motorway it was fine between 70-100 but when accelerating from a stand still it was really slow couldn’t pull the skin off a rice pudding, so I’ve changed the fuel filter and air filter still the same, I plugged it in showing multiple faults one is the MAF but I swapped these around still showing the same error on the same bank, so I took a break and decided I needed to top her up with diesel so popped over the the fuel station and decided to pop her into low gear ratio and she turns into a sports car flying off the lights like a bat out of hell, is this normal just need to check before I start replacing more bits on her.

I'd be checking for leaks in the manifolds on that circuit and the air pipes before and after the turbo. It could be drawing air from a broken or cracked pipe.

Hi Mark,

I’ve sprayed down the manifold to see if the was any tone difference doesn’t seem to have any leaks, turbos are working fine as it produces plenty of power when it’s on low ratio, we’ve even checked dpfs, this all all before I chucked it into low ratio and it ran with no issues done 0-60 like a sports car. We all looked at each other confused.

Mark Piercy said:

I'd be checking for leaks in the manifolds on that circuit and the air pipes before and after the turbo. It could be drawing air from a broken or cracked pipe.

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i'm no expert yet, but my money is on a small crack in a hose. under a light load in low box, its fine. try to shift in hi, with greater load and the crack opens up
might be wrong...

Tonyde said:

Hi Mark,

I’ve sprayed down the manifold to see if the was any tone difference doesn’t seem to have any leaks, turbos are working fine as it produces plenty of power when it’s on low ratio, we’ve even checked dpfs, this all all before I chucked it into low ratio and it ran with no issues done 0-60 like a sports car. We all looked at each other confused.

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Very little power is needed in low range to accelerate so that is a red herring. As others had said, an air leak between the MAF and manifold is likely to be the cause especially as there is a MAF fault logged.

Datatek said:

Very little power is needed in low range to accelerate so that is a red herring. As others had said, an air leak between the MAF and manifold is likely to be the cause especially as there is a MAF fault logged.

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Could be that, you might be right because we swapped over the MAF and the fault didn’t move position so I may just be a hose in between, right I’m off to buy baby powder to find this crack.

Tonyde said:

Could be that, you might be right because we swapped over the MAF and the fault didn’t move position so I may just be a hose in between, right I’m off to buy baby powder to find this crack.

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The manifolds also crack.

The manifold was our first point of call that seems ok, so it maybe the hose inbetween seems like baby powder has been chucked down there already so this has been a problem for someone else recently.

Thanks guys problem solved with this one used the smoke machine found the culprit hose all sorted now, but need to find out where the crash sensor is to sort out B1194 fault code.