I have a 1998 F 150 4.6 8 cylinder.... Problem is that when i use 87 octane it pings like crazy when I accelerate. I put in 92 octane virtually all the pinging goes away. Any suggestions on how to address this? Or do I simply get used to paying for 92 octane?

Steve

 

How many miles has it been since you have changed your plugs?

 

It's been about 30K miles.... about 4 years ago.

 

Probably internal carbon build up causing the problem.

 

Pingin and knocking are to different things first of all...but yeah tune up time sounds like to me or at least plugs like mentioned before...

 

Hey yall I dont mean to jump in on the OP thread but I'm having the same problem. I have an 06 5.4 and the past couple weeks been getting real bad ping on acceleration. I've always used 88 octane and just started bout 2 weeks ago. Ive got bout 72xxx miles.

 

Do you use the same gas everytime? Run some sea foam threw it and it should help....

 

yea ive always used the same gas, even try putting at same station or at least brand. Ive thought bout sea foam but never got around to it. Any precautions i should know bout before hand if i do that?

 

No just fill up your tank and put a bottle in....that's it for now. It will clean out carbon deposits and trash/dirt/water from your injectors/fuel system. Report back after the tank of gas is gone....

 

will do, so i dont really need to put any directly into vacuum lines like ive seen on other posts?