Supra vvti miss fire

[Sigorney14]

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"

[Frank Bullitt]

What condition are the coil pack clips in?

 

Did they use OEM coil packs?

 

Also what plugs were used? See here - http://www.mkivsupra.net/vbb/showthread.php?41927-FAQ-Spark-plugs

Edited December 12, 2017 by Frank Bullitt
Link Added. (see edit history)

[Swampy442]

As above, are they the correct grade plugs, correctly gapped?

[Mike2JZ]

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.