How can I determine what's causing the pinging?
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Melting Slicks
Joined: Dec 2004
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How can I determine what's causing the pinging?
Suddenly, my 1990 six-speed Corvette engine started pinging during accelerations after I filled up at a Shell station with 93 octane.
This was the same pinging that occurred when I filled up with 87 octane a few years ago. Ever since the experience with 87 octane, I've used 93. But how can we know if we're really getting 93 octane, even though the pump says 93? Maybe the truck driver accidentally put regular in the premium underground tank.
The engine runs fine. It idles fine. But I hear an ever so slight pringing when I'm accelerating, especially in fourth and fifth gears and sometimes in third gear. If I keep the RPM around 2,000 when accelerating, there is no pinging. But around 2,300 and higher, there is pinging.
I had been using Shell exclusively for nearly a year. When the tank got down to half full, I filled it with 93 octane at a Chevron station. I was so careful to press the button for "93," but when I got home, I was shocked to see that the station charged me for 87 regular.
Would it be feasible dump a bottle of octane booster into the tank, or would that be a bad idea?
Chevron advertises that their Techron additive will clean parts of the engine and put an end to pinging. That's why I'm using only Chevron for now. But I wonder how many tankfuls of Chevron I'll have to buy to get results.
I've never replaced the EGR valve. I did replace the spark plugs, distributor cap, rotor, ignition module, ignition coil, fuel pump, fuel filter and computer last year. -- Eric
This was the same pinging that occurred when I filled up with 87 octane a few years ago. Ever since the experience with 87 octane, I've used 93. But how can we know if we're really getting 93 octane, even though the pump says 93? Maybe the truck driver accidentally put regular in the premium underground tank.
The engine runs fine. It idles fine. But I hear an ever so slight pringing when I'm accelerating, especially in fourth and fifth gears and sometimes in third gear. If I keep the RPM around 2,000 when accelerating, there is no pinging. But around 2,300 and higher, there is pinging.
I had been using Shell exclusively for nearly a year. When the tank got down to half full, I filled it with 93 octane at a Chevron station. I was so careful to press the button for "93," but when I got home, I was shocked to see that the station charged me for 87 regular.
Would it be feasible dump a bottle of octane booster into the tank, or would that be a bad idea?
Chevron advertises that their Techron additive will clean parts of the engine and put an end to pinging. That's why I'm using only Chevron for now. But I wonder how many tankfuls of Chevron I'll have to buy to get results.
I've never replaced the EGR valve. I did replace the spark plugs, distributor cap, rotor, ignition module, ignition coil, fuel pump, fuel filter and computer last year. -- Eric
