Cadillac CTS-V Forum banner

Request Tuner Evaluation of Plugs

1143 Views 1 Reply 1 Participant Last post by  kittyboy
I have attached previous and current #4 and #8 cylinder images for comparison. The history for #8 was slight head gasket leak causing a popping condition at higher rpm's, also evident was an immaculate intake valve underside, leaking valve seals as well.

"New" images reflect 1000 miles on new plugs since replacement of valve seals and head gaskets. AFR has been approx 11.0 during this period. Have not performed pulls past approx 5300rpm during this time. Maybe 100 hard pulls and the rest normal driving.

I have scheduled a couple hours on the dyno and request an evaluation based on the plugs. Also some tips when I am on the dyno would be much appreciated! Thanks...

One specific question I have is: If I set cutoff at 6200rpm, will the engine and dyno actually provide info up to this point, or should I target a slightly higher cutoff? ty

Additional: Appears #8 might be a little lean? I want to accommodate #7 and #8, should I enrich to 10.8 WOT?
Gas Household hardware Electric blue Nickel Metal
Laser pointer Finger Cosmetics Gas Electric blue
Tire Wheel Automotive tire Tread Synthetic rubber
Automotive tire Rim Automotive wheel system Font Circle
Automotive tire Asphalt Road surface Tar Astronomical object
Grey Automotive tire Circle Astronomical object Font
Automotive tire Automotive lighting Audio equipment Circle Automotive wheel system
Tire Automotive tire Automotive lighting Bumper Automotive exterior
Gesture Finger Nickel Electric blue Household hardware
Household hardware Engineering Auto part Gas Font
See less See more
1 - 2 of 2 Posts
1 - 2 of 2 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.