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secondchance · 07-26-2011

Tom,

I chased a very similar problem - light pinging between 1800 - 2200 rpm under light load - for years. Tried evrything including a whole can of GM engine topend decarbonizing spray, BG K44, new coils, new plugs, new map sensor, new knock sensor, etc...
In the end it turned out to be injectors.
I know you have a set of RC but components go bad sometimes.
How does the car run before fully warmed up? Does the symtom you are experiencing occur during cold temp operation?

07-26-2011	#14
secondchance Join Date: Aug 2006 Location: McLean, VA Posts: 3,730	Re: spark knock problem Tom, I chased a very similar problem - light pinging between 1800 - 2200 rpm under light load - for years. Tried evrything including a whole can of GM engine topend decarbonizing spray, BG K44, new coils, new plugs, new map sensor, new knock sensor, etc... In the end it turned out to be injectors. I know you have a set of RC but components go bad sometimes. How does the car run before fully warmed up? Does the symtom you are experiencing occur during cold temp operation?