kevmor99

My I35 with about 110k miles pings when it gets hot out (85-90+ F), usually around 1500-2500 RPMs. If I step on it, the ping goes away. I'm running premium (91 octane in CA), replaced the spark plugs with NGKs at 100k miles, tried seafoam in the vacuum line with no improvement. I tried switching gas stations, but it always seems to be there with hot outside temperatures. It does burn about 1 qt. of oil every 3,000 miles or so. When I changed the spark plugs, the #5? (the rear driver's side) had oil above the spark plug where the coil connects. I don't think it's leaking into the cylinder at that point because of the spark plug sealing it off.

Anyone have any ideas? It runs fine but sounds bad with constant pinging sometimes.

Darkstonian

First, I would say start using 93 octane gas, especially if you look for the cheapest gas around. Sounds silly, but makes a helluva difference in the long run. But besides that, the only other things I think it would be is the ignition timing being off either burning too soon or too late. And if your oil leaks, if it gets low enough, you can get rattle from the valve train and oil pump. And too, make sure you use the recommended viscosity. I know for the I30 it's 5w30, for yours it may be the same. I don't buy that using 10w30 crap in the winter, just stick with what the manual says, cause the wrong viscosity can ruin hydraulic lifters, which can cause pinging also.