02panther

02 SS with 48000 mi. ,every time I hammer down ,it starts pinging up in the higher RPMs and as soon as it changes gears (automatic).I use nothing but 93 octane and I drive it everyday.What does it need guys? Motor is all stock except for SLP lid.
Thanks
Larry

fleetmgr

I'd guess your knock sensor is toast.

Fire-formula 93

iTrader: (1)

First thing I would do is clean your MAF sensor with some electrical contact cleaner and a Q-tip (very carefully of course), cured that exact problem on my old 02 TA

killagt

iTrader: (3)

what gas brand did you use ? try to use Shell or chevron, or exxon. top tier gas.

ULTIMATEORANGESS

iTrader: (4)

is it throwing any codes?

02panther

I do use either BP,Shell ,or Chevron gas.Not throwing any codes.I'll try cleaning the Maf sensor tomorrow and see what happens.Thanks for the advice!

02panther

Fire-formula 93 ,thanks so much for the advice.I removed and cleaned the MAF with Q-tip and alcohol , problem gone !!

1SWT95Z

just for future reference, can someone explain why cleaning the MAF wires would fix detonation?

zfastss

iTrader: (6)

The MAF wires get dirty over time (covered with all the tiny dust particles that get past the filter) so it can't take an accurate reading of the air entering the intake and therefore the computer calculates the wrong air-fuel ratio, making the engine ping. This is much worse if you run a "re-useable" filter that uses oil (like K&N) because if you over oil the filter the extra oil particles get sucked through the filter and stick to the MAF wires again throwing off the air-fuel ratio.

HotSilverBird

Low fuel pressure, dirty fuel filter, clogged injectors are a few things that will cause pinging. My 99 started to ping at WOT and I found the fuel system was toast, fuel pump rusted and fuel lines rusted. Injectors screens were clogged with rust. I'd check it over carefully.