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got a misfire after i change stock turbo for stock turbo man that done it pulled the lanber sensor plug off leaving the wires exposed he pushed them back in and car was fine but now have a misfire but not all the time any help would be helpful
 

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IIRC, the car will basically run ok with the lambda sensor disconnected - I don't think the mapping relies on it. I think the stock sensor only really kicks in slowly, like on motorway driving, to even out the mixture a bit.

I have no idea if shorting the lambda sensor wires could damage the ECU, or cause an ignition problem, but I doubt it.

Otherwise, I would say if you have a misfire, it is not related to your turbo. I guess you could have an exhaust leak (if he didn't rebuild properly) but the usual suspect for misfire is a knackered ignition system (coils, bad electrics / earthing, etc).

When does it misfire (high revs, under load, on boost, etc)?
 

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Yeh, dunno, lots of possibilities you'll have to eliminate.

If you get stuck with the lambda sensor, let me know, I think my old stock one is lying around somewhere.
 
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