Disco 2 Misfire (I think!) / Overboost

Pawl · Mar 7, 2016

When you changed the wastegate, did you use a Nanocom or Hawkeye to adjust the wastegate rod to get the correct boost ?
Is it possible that road adjustment after change is wrong, causing overboost & therefore fuelling cut-off ?

neilly · Mar 7, 2016

Pawl said:
When you changed the wastegate, did you use a Nanocom or Hawkeye to adjust the wastegate rod to get the correct boost ?
Is it possible that road adjustment after change is wrong, causing overboost & therefore fuelling cut-off ?

Hi Pawl,

Appears the OP solved his problem on the previous post to yours,

Surely if the wastegate rod was thought to be a problem it would be easy enough to unscrew a few turns and see if the problems is resolved, common consensus IIRC seems to be that 13 threads visible is the norm, with the potential to reduce a few threads if the overboost does not cut in. Especially if a nanocom is not available.

Cheers

Pawl · Mar 8, 2016

neilly said:
Hi Pawl,

Appears the OP solved his problem on the previous post to yours,

Surely if the wastegate rod was thought to be a problem it would be easy enough to unscrew a few turns and see if the problems is resolved, common consensus IIRC seems to be that 13 threads visible is the norm, with the potential to reduce a few threads if the overboost does not cut in. Especially if a nanocom is not available.

Cheers

Neilly, you're - after I posted I realised it was the OP who'd last posted.
I thought I'd deleted my post - but obviously not !
Need to pay more attention when on mobile phone - lol

Stookie42 · Jul 12, 2016

I think my D2 suffers overboost also. It accelerates well until 3500rpm and then there's a big jolt and a loss of power. It only last for a half a second but it's infuriating. Red plug is clean, new MAF fitted, no fault codes on Nanocom.
Any ideas?

neilly · Jul 12, 2016

Hi Stookie,

If you record live data on nanocom, what does it show? Turbo pressure?

If you look at your wastegate actuator rod, how many threads are showing?

You can load the excel file up here for review of the live data from nanocom.

Cheers

Joemac434 · Jul 12, 2016

Hi mate if you get continuous jolting / shuddering while on the throttle it could be the fuel pump in the tank or pressure regulator not delivering enough fuel

sierrafery · Jul 12, 2016

IMO with low fuel pressure it won't go up to 3500rpm whatsoever... see the MAP(manifold pressure) in the inputs fuelling section and if it exceeds 240 also if the MAF(air flow) goes above 680 the same thing happens, for high MAP it's overboost for high MAF can be a leak on the intake between the MAF and turbo... as neilly sais the best would be a live data log then we can see.

Disco 2 Misfire (I think!) / Overboost

Pawl

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neilly

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Pawl

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Stookie42

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neilly

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Joemac434

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sierrafery

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