backfire problem

[tim21391]

i have only been driving my truck maybe twice a week.... yesterday (sunday) i decided to finally tighten my tranny line on my radiator... then i noticed i had a spark plug wire that had fallen off...i knew i was running rough before so i plugged it back in...it now has a smoother ride...but now when i get up on the interstate i hit passing gear... and it back fire takes off backfires again and so forth...i noticed i had a little rust on the plug like it fell off a long time ago....could the backfire mean that im not getting a good spark and the tip of the plug needs to be cleaned...if so would it work if i took sand paper to get the surface rust off??

thanks,
tim

[piecesparts]

Definitely a possibility or you have a bad plug wire.

[tim21391]

the wire looked good when i put it back on...ill try taking the plug out and taking sandpaper and clean it up then hit the interstate again and tell u if that helped..thanks

[estig70]

Originally Posted by tim21391

the wire looked good when i put it back on...ill try taking the plug out and taking sandpaper and clean it up then hit the interstate again and tell u if that helped..thanks

Deffinatley remove that spark plug, Plug + no plug wire attached = fuel fouled spark plug, no spark to burn the fuel.

Hope this helps.

Eric

[tim21391]

i know plugs dont cost that much but would you get a new one

[Wrenchbender Ret]

Look in the dist. cap. When you run with an open wire like that it burns a track in the inside of the cap & will crossfire under load.

[tim21391]

i put in a new $2.24 ac delco plug and it fixed the problem runs smoother now