turbo 6liter woes
04-07-2013, 07:35 PM
#1
turbo 6liter woes 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, 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!
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, 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!
Trending Topics
04-08-2013, 07:55 AM
#8
TECH Apprentice
iTrader: (3)
Join Date: Feb 2007
Location: In front of Mustangs
Posts: 350
Likes: 0
Received 0 Likes
on
0 Posts
What is wrong with the plugs he is using? I have a set or BR7EFs in my toolbox but I run a TR6 and it worked fine for me at the same boost level so I just left them. I wondered about the BR7s
04-08-2013, 08:28 AM
#10
TECH Apprentice
iTrader: (3)
Join Date: Feb 2007
Location: In front of Mustangs
Posts: 350
Likes: 0
Received 0 Likes
on
0 Posts
Not to jack but how how would you say the TR6s are for that boost? This is making me want to go to 8s even though there were no problems yet.
Last edited by 1sick-Z; 04-08-2013 at 08:39 AM.
