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Discussion Starter #1
I've had a small pinging for about a year now. It's only just off idle and goes away under load and if I burn premium gas. I've tried all the major brands of gas with no cure. I've burned Cheveron regular 95% off it's 42k life. My local dealer said it's the gas, but maybe crank sensor or something with the timing advance? help!

:eek:
 

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All, and I mean ALL, GM small blocks have audible piston slap at and around idle. It's normal, Saab dealers don't know this, though.:lol:
And considering that these small blocks have been known to go 250,000+ miles without even changiing the plugs, I wouldn't worry.
 

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It goes away when I run premium gas though. It's a ping (light when I thought advancing my timing on my 71 240Z +15 deg :) not a knock sound.

Please leave a note if you have noticed the same thing.
 
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