Scotty,
I have 2000 Avalon auto trans w/211k miles. When I start the car from cold, there's no pinging when I step on the gas. Once the car warms up, though, I get pinging even when I'm going about 40mph and want to kick it up to up for an on-ramp. If I step harder on the gas, I get a slight hesitation, then the car moves without pinging.
I've heard that this can be damaging. My temp guage is just below the mid-point, so I don't expect heat is the culprit. I'm thinking that there are deposits in the cylinders. What can be done and why isn't the computer adjusting for the pre-ignition?
In days gone by (I'm 71), I would've thought a higher octane would be called for, but you said modern cars can adjust to a lower octane; you just lose power.
BTW! I tried the SeaFoam Hyra Trans Tune to free up my power steering and it is working quite well!! You're a great resource and a lot of fun!
Well of course it's a car ages the timing chain or timing belt stretches some and of course is the engine heats up stretches even more I wouldn't worry about it as long as it rides fine otherwise because rebuilding an engine is an astronomical cost and those things can run a really long time slightly warm.but just out of curiosity put a tank of shell v power and then if it goes away that would pretty much prove that the timing is off a bit from internal
