TTransport

I'm running the GIAC BT tune with 93 octane, at idle (1000Rpms) I have random misfires cylinder four / two are the worst 25~50 misfires, cylinder one and three around 4~10. Once I break 1750 rpms no more misfires. I've tried: plugs (factory,IK22,IK24), gaps(.26,.27,.28,.30), injectors(Siemens 3172 55lb 575CC), coil packs, different speed sensors, etc and have yet to come up with any combination that takes care of it. I had the same symptoms with the old factory software and my old eurospec head.



Could it be the cam position sensor? Commonly called the HAL?

Could it be the schrick cams intake 252 exhaust 260?

Could it be the weight of my harmonic balancer it is 3.4lbs, Eurospec used a 2.2lbs?

Could it be that I need to get variable gears on the end of my cams to try to adjust the amount of intake or exhaust separately?

Perhaps I need to tune in more timing at idle?

A400

I sent you an e-mail earlier. IMO cams are a hinderance unless you have a GT30R or larger. Performance cams are notorious for being hard to tune idle thru 2k rpms. Log the car from idle thru end of problem area and send to GIAC, it will probably cost some tuning money to get it fixed, or you could go to stock cams. At least if you still had the problems after cam reinstall you would know it was not the cams and you would have other issues to address.

TTransport

Thanks, GT3071, appreciate the advice