I need help

[Krylonking]

ok my rb20 s13 was running great earlier today but when i took it out tonight it started pre-igniting , if i went easy on the throttle it went fine but when i went wide open it started pre igniting , it seems like the computer is trying to advance the timing too far , i have no clue why

[fast_s13]

hey i had the same problem try pulling your plugs and put some dielectric tune up grease on the plugs and see what that does. also have you checked your timeing

[rbsileighty]

What was the temp diff between earlier in the day and when you took it out at night?

[fast_s13]

that shouldnt matter because it would be cooler at night time