PING PING PING!

how is the FP at 3/4 throttle? how hot is the motor running (based on stock gauge or aftermarket gauge)?
codes?
good luck.

LOL I had the same problem but never changed any of the MAF or anything like that just got an off-Road H-pipe and never had the problem either that or I can't hear it over the Pro Dumps LOL. Although I have noticed that my gas millage has gone down probably cuz I hold it wide open all the time now LOL. What I love to do is get up next to someone down a hill or under an over pass turn the car off down shift from 4th to 2nd and cost a little bit then turn it back on and KABOOM scared the crap out of people hehe. I know I"m evil LOL

ah, i forgot the easy one. what is your timing? seems like the SN's have more ping issues and have to be careful of base timing settings.

Timing is important. Also, what octane of fuel are you running? In the summer I would run 91-93 octane with no more than 12* of timing. You may have a ton of carbon build-up on the pistons and combustion chambers. So, you might want to go event lower timing. Say 8-10* and run the higher octane till cooler weather comes.

rich1223,

Here's one more thing to add to your check list. An EGR system that is not functioning correctly is a definite candidate for causing PINGING problems!

When exhaust gases are re-circulated into the combustion chambers, they SLOW the burn rate since they are inert gases. This means that the computer has to INCREASE spark timing so that the fuel/air/EGR gas mixture completes burning at the proper time for optimum power. According to industry articles that I’ve read the computer will advance the timing about 2 degrees for each 1% of EGR flow, up to a total of 20 degrees of additional advance at 10% EGR flow! So, if your system is NOT re-circulating the correct amount of EGR gases and the computer still advances the timing… you’re gonna ping for sure!

Same thing will happen if your EGR system is sucking in outside air from anywhere that it shouldn’t, e.g. a leaking EGR valve to intake manifold gasket or a leak in the exhaust header to EGR valve transfer tube. Air burns! EGR gases don’t. The extra air is gonna cause pinging if the computer thinks that it’s all EGR gases and advances the timing.

Good luck, and let us know if you get it solved.

What are your plugs gapped at? I used to have problems on the juice, but gapping the plugs a little tighter helped a lot. Now I can predict my ping based on my fuel pressure setting.