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lrrs168 · 04-05-2004, 11:54 AM

I have a '96 GT, it has a Borla cat-back and K&N filter, otherwise stock...
It has been pinging on any fuel lower than 91 octane. The manual says it should run on 87, what gives?

I had heard I may have carbon build up on the piston and valves causing pre-ignition and that I could use a "combustion chamber clear", the kind you suck in thru a vacuum hose, not "fuel injector cleaner" that you add to the gas tank.

Any advice would be greatly appreciated, thanks

Rich

04-05-2004, 11:54 AM	#1
lrrs168 Registered Member Join Date: Nov 2000 Location: Cromwell, CT, USA Posts: 8	4.6 pinging I have a '96 GT, it has a Borla cat-back and K&N filter, otherwise stock... It has been pinging on any fuel lower than 91 octane. The manual says it should run on 87, what gives? I had heard I may have carbon build up on the piston and valves causing pre-ignition and that I could use a "combustion chamber clear", the kind you suck in thru a vacuum hose, not "fuel injector cleaner" that you add to the gas tank. Any advice would be greatly appreciated, thanks Rich