Originally Posted by kimmer415
My '99 3.0 started pinging more about a month ago - I checked the location of the air inlet temp sensor to see if I could replace it myself (I was told it might be faulty) and found that the vacuum hose had fallen of it. I replaced the hose and the truck runs fine. It's worth checking the hose for cracks or drying out, too.
Absolutely! Any unmetered air that enters the intake after the MAF sensor will cause a lean mixture and aggravate the 3.0's tendency to detonate.
Originally Posted by RangerEdgeO2
What if you don't have an EGR? Mine has never pinged and lately it is starting to ping under normal acceleration and usually when I have a passenger and the AC full blast; my gas mileage has gone to hell too.
Everything is kept maintained (Oil/AirFilter/FuelFilter/TirePressure etc...). Any suggestions on what can be done? I haven't reset my computer in over a year (I usually try to do it at every oil change) do you think that could help? I'm thinking a bottle of BG44K wouldn't hurt either.
Resetting the PCM will not do anything permanent. Your truck will soon learn its way right back to where it is now.
I have heard of people in hot climates using lower temp thermostats (180F instead of 192F) to minimize the ping. Also, some owners run combustion chamber cleaner through it now and then to remove combustion chamber deposits. CC deposits can cause hot spots that lead to preignition and can also raise the compression pressure causing detonation.