Still knocking and pinging
Thread Starter
Instructor
Joined: Apr 2005
Posts: 137
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Still knocking and pinging
I'm not able to get rid of the knocking and pinging in my '99 frc. I've tried fuel treatments, 93 Chevron w/ techron, and replaced the fuel filter. It knocks and pings under somewhat heavy acceleration in almost any gear. My last two options are to change the spark plugs or replace the knock sensor. Am I way off? Please advise.
Supporting Manufacturer
Joined: Sep 2004
Posts: 352
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Get a scantool and check the sensors, such as the O2, TPS, etc... Otherwise you will be chasing the problem forever. Any good shop can check those and not charge a fortune... But be sure all filters are good.
Does the problem happen at full throttle as well or just partial to heavy throttle?
Can you really hear it detonating?
Bob
Does the problem happen at full throttle as well or just partial to heavy throttle?
Can you really hear it detonating?
Bob
Team Owner
Joined: May 2004
Posts: 26,345
Likes: 232
From: SoCal
Originally Posted by babalu95
I'm not able to get rid of the knocking and pinging in my '99 frc. I've tried fuel treatments, 93 Chevron w/ techron, and replaced the fuel filter. It knocks and pings under somewhat heavy acceleration in almost any gear. My last two options are to change the spark plugs or replace the knock sensor. Am I way off? Please advise.
Did you do the decarb?
DH
Instructor
Joined: Sep 2003
Posts: 185
Likes: 0
From: gaithersburg MD
Originally Posted by babalu95
I'm not able to get rid of the knocking and pinging in my '99 frc. I've tried fuel treatments, 93 Chevron w/ techron, and replaced the fuel filter. It knocks and pings under somewhat heavy acceleration in almost any gear. My last two options are to change the spark plugs or replace the knock sensor. Am I way off? Please advise.
Never could get rid of it so i got rid of the car. Seemed to be HEAT related. Ran into others with 99s and many had the same issue. Coincidence? Maybe not. Now driving a heavily modded 02. No problems anymore!! Again, if all else fails look at your operating temperature as a potential issue and do what you have to do to try and keep it 
See if it eliminates the problem. Good luck!
Team Owner
Joined: Mar 2002
Posts: 47,647
Likes: 1
From: Queens, New York Life begins at 183 mph....
St. Jude Donor '08-'09
Have you done any mods to your vette? My vette started pinging somewhat when I installed my blackwing air filter. It happened mostly on hot days and especially if I turned the air conditioner on. When I had my headers and LS1 edit installed, it turned out the vette was running too lean, my air/fuel ratio was corrected and now she purrs like a kitten growl like a tiger at WOT!
If not, I'd have the spark plugs changed. Maybe you've lost a puck or two on the spark plugs and that might cause the pinging.
If all else fails, take it to a good dealership, they should be able to diagnose the problem.
If not, I'd have the spark plugs changed. Maybe you've lost a puck or two on the spark plugs and that might cause the pinging.
If all else fails, take it to a good dealership, they should be able to diagnose the problem.
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Safety Car
Joined: Sep 2003
Posts: 3,558
Likes: 2
From: Cape Coral FL
I have a 99 and used to have Knock Retard. About 5 degrees. It got worse after my h/c change. Then I installed a 160 degree t-stat and reprogrammed the fans. THen I started using Sunoco Ultra 94 octane. And finally I instaled NGK TR6 IX (iridium plugs). Knock retard is gone. I have since milled my heads .030" and still no KR. The 99 has a pretty aggressive stock spark table. You have to be willing to run the motor cooler, highest octane gas, and cooler plugs.
