i know this is a truck site but i have a 4.6 2v in my 98 gt. it has 143k miles and runs great except for the pinging it has. it only does it at 3000 rpms or higher in 3rd, 4th and problably 5th gear, due to the increased load. the weird thing is that you dont have to give it much throttle to cause it as long as your above 3000 rpm. ive changed plugs, cleaned tbody, done a decarbon service, changes the fuel filter and even put in a 180 tstat trying to richen it up hoping it will go away. no luck. where is the knock sensor and how do u check it? please give me some ideas. thanx

 

Try cleaning the MAF. Sounds like a lean condition. If the MAF filaments are dirty, it will not read proper airflow and not richen the mixture like it should.

 

ok. ill try that. can i just use tbody cleaner or do i need something special?

 

Anything that won't leak a residue like electrical contact cleaner, brake parts cleaner or probably TB cleaner. Just spray it down good and let it dry then see if it does any better. Don't touch the filaments, they break easy.

 

I have a 2002 F-150 with the 4.6 and I have a real weird pinging situation. I'm in NJ and 2 years ago in Sept 2005 it started pinging when the OUTDOOR temps dropped below about 60*F when using regular gas. Above that outdoor temp it runs great on regular. I replaced the air temp sensor in the intake snorkel and cleaned the maf carefully. I used maf spray cleaner and did not touch the wires. They were clean when I was done. It lessened the pinging but it was still there. I got a tank of Exxon reg a few weeks ago and it pinged REAL bad. I've been running Shell hi-test and the ping gone. Any idea's. Remember it it's outdoor temp related. Any other sensors I should be looking at that feed outdoor temps to the computer to control the timing?

I have no codes or pending codes.

Whimsey

 

I would suspect that the EGR port in the intake may be clogged. I would check that first.