Dtc trouble code p0304

[eviL03]

i have a 2004 marauder with 52k miles......i pumped gas on sunday and 30 mins later i got a rough idle and a trouble code soon after P0304 (misfire cylinder #4) i took off the coil and plug and they both look new...could this be internal?...bad plug?...coil? or can it be that i just pumped bad gas?....any help would be appreciated...thanks

[hotford]

i have a 2004 marauder with 52k miles......i pumped gas on sunday and 30 mins later i got a rough idle and a trouble code soon after P0304 (misfire cylinder #4) i took off the coil and plug and they both look new...could this be internal?...bad plug?...coil? or can it be that i just pumped bad gas?....any help would be appreciated...thanks


I would first move the coil on plug and see if moves to the cylinder you placed it on, if it doesn't have a look at the plug and move that to another cylinder, this should help isolate the problem, The fuel could just be a coincidence.

[eviL03]

thanks alot for the info...i replaced coil 4 with coil 3 and got code 303 ...so i replaced the coil and car runs great again.....i just cant understand why i had a bad coil at only 50k miles....

[justbob]

More like age. Was the boot cracked at all?

[LeoVampire]

Maybe that one coil was made on a Friday when people were rushing to get out of work for the weekend???

But no one can tell when a part will go bad unfortunatly.

It's just the timming that make's us nuts because it always seems like something else causes it when they are unrelated most of the time.

[eviL03]

no boot was fine...coil looks like new...it was weird.....thanks for all your help....i have been on this forum for a while but never really posted....i used to own a 2003 black merc(107k miles) but sold it to buy a 2004 silver birch (50k miles)....sold the black one for 8k bought the silver one for 9k......got a good deal ...only thing i had to replace was the coil