Power FC tune- car running too rich?

[«Cyph3r»]

Hi,

I had my car with a power fc tuned in sydney by a very reputable tuner about 4 months ago. Since then only mods have been a power fc hand controller and tacho. I have noticed recently that when i rev the car to 6k or so and then back off the car doesn't just blow smoke for a sec but has black smoke coming out the exhuast for a while afterwards! The car was tuned with bp ultimate in sydney and i am in qld and have been using optimax and ultimate and have noticed it doing this when running optimax but haven't checked when using ultimate. Does this sound like a bad tune to you as they spent ages doing it and didn't seem to blow much smoke on the dyno... only for a sec when they backed off. Anyone know what could be causing this??? Perhaps wire from ecu has come loose or somehow power fc reset or something? I have had battery disconnected for ages since tune like a week or so but this shouldn';t affect it.

Thanks

Jamie

[4 Doorz]

is it worth just trying straight bp ultimate for a few tanks before worrying further?

[«Cyph3r»]

yeah . i'll do that now that the local bp finally has ultimate... used to have to drive 1/2 hr to get it I think somehow though the power fc must have reset or a sensor is not working properly or wire came detcatched or even fuel not burning properly purlely because i don't understand how the different fuel could make that bigger difference