[thumbster]

Originally Posted by tundrakc

Well,

It's been a while but I finally got Toyota to send a rep down to the dealer to meat me and discuss the "ping" problem I have. After a hour BS session where I was told that "ALL" Tundra's ping and that Toyota knows all about the problem (it's been doing this for 5 or 6 years now!!! from the 2000 - 2005-6 model) and that I should not be concerned about it. The problem is caused by the "short-skirt" piston design that they use in the 4.7 V8. The short skirt lets the piston cock and this causes piston slap (pinging) blah, blah, blah.... What a bunch of crap!!! You mean to tell me that in 5 or 6 years of production they couldn't fix this problem? Is this a Toyota or a Buick? - Tundrakc

First off, piston slap sounds totally different than spark knock (pinging). Higher octane gas can help, but one tank full is not going to show you a difference because the ecu takes several hundred miles to relearn any changes in air/fuel ratio and spark timing. Disconnecting the power to the ecu isn't going to speed up the process either. I've found that 87 octane fuel is optimal for our tundras (mine at least) and causes no noticable pinging or other problems. I would contribute the factor that the tundra ecu is calibrated to run very lean, which would certainly contribute to and cause pinging. If the O2 sensors were slightly under toleranced it would make the problem even worse.