Hi all , great forum , been looking for an answer for my problem , hoping some one can help.Changed spark plugs , but now I'm getting check engine light.So I took it it to auto zone it came back that cylinder 4 was misfiring.Changed the boots from cylinder 1 and cylinder 4 and took it back to auto zone and same thing came up, cylinder 4 misfire.I bought another plug and replaced it still get same thing.Any body know what is up.I tried resetting computer by unplugging it for 15 min. Light stays of for a wile then when I restart truck I get the engine light on again.Any help would be appreciated.Thanks

 

same thing happened to me. disconnect negative terminal on battery, go smoke a cigarette, hook it back up. problem most likely solved.

it's probably your vehicle used to the new improved timing supplied by the changing of you plugs.

 

Unfortunetly thats the first thing I tried, including , after unpluging battery , turning on key to on position and waiting 20 min. But still after like the third time I turn on truck , I get the check engine light.Any other way?Thanks

 

What year truck? Which motor? A proper reset is to pull the PCM fuse, get in the truck and close the door (shuts of the chimes). Turn key to on (not start) and wait for the chimes to stop and indicators to settle. Put the fuse back in an' start 'er up. It won't start the first kick, so don't panic. If the CEL comes back, make sure all the plug and coil wires are snug. You may have a bad coil, but that may trigger a different code.

 

Thanks for response, It is a 2006 dodge ram 1500 6 cylinder , I dont think its the coil , because I swaped out coils from cylinder 2 and put it on cylinder 4 to see if I would get a misfire code on cylinder 2 and I did not , I got again cylinder 4 misfire.I will try the the pcm fuse.Thanks

 

Another thing I used the bosch platinum plugs, the guy at autozone said that was no good for dodge trucks , is this true , they wereone ofthe ones recomended for my truck.The code that comes up is P0304.Thanks

 

true, apparently dodge motors like champion copper plugs.

 

dude, u have the same truck as me...

i'm surprised the battery disconnect didn't work. i'm running ngk iridium ix plugs...maybe i had a lesser problem cause our stockers were regular ngk's anyways.

so yea, get back to us. i'm sure that fuse pull will work.

 

only use champion coppers.

Look under your hood on the left side and get the number. Like rc somethin somethin

did you get the right gap? Yours should be a 40

 

are you saying that YOU only use coppers? or that everyoen should only use coppers?