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I have a Nissan Skyline r33 gts-t 1994, fitted with a Microtech LTX12. My mechanic can never seem to tune it right

problems include

- high idel (1,500 rpm)

- misfireing

- poor fuel consumption (average 250km per tank city driving), now lean spots after he leaned out the tune and still poor fuel econmy

- afterburn, flames out of the exhaust after you change gears on full throtell

I go back and he 'fixes' it for free as i have already paid him for the work but it never seems to get fixed.

the same sort of thing happened when i got the engine rebuilt, but now its ok (i think).

what shall i do?

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The microtech is a downgrade in my opinion on the RB series motors.

They are such a refined piece of gear that when run by a less then great management system makes the entire car/engine a real pain to drive and live with.

A better match for the your RB engine would be a PowerFC or Motec.

I've seen even really well respected tuners and workshops tune Microtechs on the RB and unless you spend lots of hours on tuning/cold start etc etc you may never get a factory type operation.

PowerFC is designed to work with all factory sensors and already comes pre-programmed for cold starts etc.

Regardless of the above though, the symptons you described could be mostly ironed out by a decent tuner.

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