been having a problem I have been fighting for a sometime now, my 99 trans am, iron lq4, turbo...will occasionally close the sparkplug gap on cyl 7, and it happened once on cyl 2. im running ngkbr7-ef plugs
ONCE it chipped a ring land right of cyl 7, and it smoked out the valvecover breather and you can tell the engine was hurt, as it would also misfire at idle only. so I removed/replaced cyl 7 piston and rings and all was good.. well this happened again today, I got on it hard, rowing through gears, full boost, brand new plugs and wires, and cyl 7 closes the gap again and I had to dogleg it home. im gonna run a borescope down the sparkplug hole and check out the piston, but I am doubting its hurt, as I have no driveability issues after I replace the plug.
car was tuned properly by Brandon, just trying to get an idea of what could be going wrong here, possibly a weak coilpack? or a bad map sensor (3bar sd tune) and its detonating closing the plug gap? HELP!
If I cant resolve this issue, im unfortunately gonna havta withdraw from the half mile event.
ONCE it chipped a ring land right of cyl 7, and it smoked out the valvecover breather and you can tell the engine was hurt, as it would also misfire at idle only. so I removed/replaced cyl 7 piston and rings and all was good.. well this happened again today, I got on it hard, rowing through gears, full boost, brand new plugs and wires, and cyl 7 closes the gap again and I had to dogleg it home. im gonna run a borescope down the sparkplug hole and check out the piston, but I am doubting its hurt, as I have no driveability issues after I replace the plug.
car was tuned properly by Brandon, just trying to get an idea of what could be going wrong here, possibly a weak coilpack? or a bad map sensor (3bar sd tune) and its detonating closing the plug gap? HELP!
If I cant resolve this issue, im unfortunately gonna havta withdraw from the half mile event.