Quote:
|
Originally Posted by alw
He says the pinging I hear is the computer adjusting the timing to make up for the gas
|
Huh? The pinging, also known as "detonation" indicates that the octane rating of the fuel is too low for the current conditions of the engine. Under these circumstances, one would expect that if the computer is adjusting anything, it would be retarding the timing which would tend to stop the pinging. (along the same line, the aftermarket chip mods do the opposite, advancing the timing to run at higher compression and requiring the use of higher octane gas to get a little more HP) Maybe the dealer meant that it will take some time for the computer to adjust the timing to stop the pinging? Did you switch from 91 down to 87 when the pinging started?
Maybe you got some crappy gas? Have you tried different brands of 87 octane? If your truck won't run without pinging on good quality 87, I think it would be an indication that the computer is not correctly adjusting the timing.