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The mkiv Supra Owners Club

Supra vvti miss fire


Sigorney14
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Hi I'm wondering if anyone maybe able to help I've got a vvti which I've just singled it's running on a adaptronic modular m 2000 ecu and 1000 cc denso injectors my local mapping shop have come across a issue on low boost 7pi the car runs fine however once boost goes 0.8 bar or above it develops a miss fire they have tried new coil packs and igniter and also new plugs but still has a miss fire does anyone on here have any other ideas like could it be injectors I'm at a loss and feeling a little fed up any input from anyone in the no would be really appreciated many thanks Wes"

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Check for any trigger/rpm sync errors on the ECU. Check you aren't hitting some sort of ignition cut due to a safety limit.

 

Given that it's giving you issues with more boost then I would hazard a guess it has something to do with your combo of ignition coils/spark plug gaps etc. As for injectors, try and see what duty cycle they are running at with more boost, check you aren't running too lean/rich etc.

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