my car was pinging a lot between 3k and 4.5k. i got a tune up and use 93 octane. i recently used seafoam (1/2 in brake booster line and half in tank) and it seems to ping alot less. i plan on using one more can and cleaning the MAF when i replace my air filter with a demolet CAI. my one friend said cleaning the MAF isnt good unless you are pulling a MAF code. is it ok to clean MAF anyway? will this and the new filter and seafoam again solve my problem most likely? and if i dont have a CEL on will i still be able to pull codes wit ha digital code reader? my rear main seal was leakign and i am getting taht and the clutch replaced on monday (hopefully) so i figured the oil that was leaking gummed up the 02's. ok sry for the long post, thanks!!