Suburban Pinging

[98BLACKBURB]

I have changed O-2 sensors,fuel filter,air filter,tryed Seafoam in gas tank,and top-end,all of a sudden it likes 93 octane instead of 87 which never give me trouble before, I believe it is ignition related now, it has a 350 w/146,000 miles ,was tuned up w/platinum plugs and cap and rotor by Chevy at 90,000.is it time for a tuneup or do I need something else?EGR? What do you guys think?

[mcreyaufmiller]

I think you have been trying to put some cheap gas in your baby. Try a different brand of regular. Before I got my computer tuned, I had a similar problem, there was a cheap station in NJ that I would fill up at and if I did with regular, the truck would ping and knock. Then I started filling up at only brand name stations and the problem went away. Now with the new computer, I can fill up anywhere with no problem.

[ness5575]

I think you have been trying to put some cheap gas in your baby.  Try a different brand of regular.  Before I got my computer tuned, I had a similar problem, there was a cheap station in NJ that I would fill up at and if I did with regular, the truck would ping and knock.  Then I started filling up at only brand name stations and the problem went away.  Now with the new computer, I can fill up anywhere with no problem.

 

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i agree - the kwik trip by my house makes my truck ping like crazy for whatever reason (our envoy is not effected by the gas there).

shell, or citgo or bp and my truck is fine...