I have been getting some knocking the under most any loads . I do not have any codes. I tried premium gas and that did not make any difference. If this is not fixed what issues can this cause?

What should I look for do get this fixed? Thanks for your help!

 

Like a rod bearing knock or a spark detonation knock?

 

Pre detonation thanks!

 

Then it could be the knock sensor. would need to know what the vehicle is to give an exact location, but most are under the intake manifold.

 

Strange, guess when using the mobile app it does not put you signed in.

1999 f150/250 badges 5.4 auto 258k 3.73 tow package. Single cab long bed 4x4

Thanks

 

Bummer, it is under the intake.

 

Figures. If the sensor was bad would it throw a code?

What will it damage if this continues? Thanks

 

I'm not saying it's definitely bad only that it's a pretty good possibility. It will throw a code if it is in some way damaged/shorted/disconnected. If however it's sensitivity is somehow reduced, then it will fail to retard the timing and allow spark knock without setting a code.

 

Thanks for the great info. Besides retarding the timing, what bad things can happen if this is not fixed?

 

Lots of bad things can happen...you can burn a hole in top of the piston, burn off spark plug electrodes, break off valve edges, just to name a few of the more serious possibilities.

Lots of pictures of damage here: https://www.google.com/search?q=deto...&bih=741#spf=1

 

Ran a can of b12 through it and the knock is gone. I thought it may be an option octane booster but it's not https://www.berrymanproducts.com/solution-central/looking-for-an-octane-boost/

Has anyone herd of this happening while using b12? I have used it for other issues and I am totally sold.

 

Nope, it's just a fuel cleaner that can help with minor carbonized surfaces like valves and fuel internal areas like the injectors. But it's still less expensive than tearing into an engine.

 

Used the B12 on my daughter's chevy tracker. 2.5L Suzuki v-6, had lost a ton of power while she was "in town" driving while away at College. Drove it home and only got 17 MPG, normally 22-23 highway. Bought 2 cans, dropped it all in at once, drove it around all weekend. She called on the way back and sid it had all it's power back!!!

For a little small V-6, it red lines at 6700 rpm. It will hall the mail in that little suv, and is a blast to drive.

P.S. For general information, to help keep carbon build up at bay, DO NOT buy gas from the same place all the time. Run a tank of Exxon, then Chevron, then Shell, then wal-mart, then ????. By rotating who's fuel you run, you are getting additive packages that vary. Granted, they are probably all close in formulation, they are tightly kept secrets by all the companies. By rotating, you get something a little different that helps keep everything free from build up.

P.S.S. I am not a chemist, but do work for a large oil company, and deal with every brands additive packages.

 

Have you ever tried Seafoam, if so how would you say it compares to B12?

 

Other than a higher octane, does the premium gass have more or better additives?