Code P0304 just happened on the way home.

[jep604]

On my way home from work, I have to make an abrupt lane change because some idiot was in the "hammer" lane on Route 1. As I moved two lanes over and went around them at about 95 mph while watching the white BH 5.0 Genesis that was in front of me gaining slowly after he made the same lane changes. I looked down at the dash and had a blinking "CEL". After about two miles it wet steady after another request for power. Checked it with the scanner when I got home and it showed the above-mentioned code, "Cylinder #4 misfire detected". It cleared after a startup. The scanner stated it triggered at 86 mph and 5029 rpm. Will monitor it tomorrow.

 

[Charlie1982]

Blinking CEL often means major misfire(s). How many miles are on your spark plugs & ignition coils?

 

[jep604]

Blinking CEL often means major misfire(s). How many miles are on your spark plugs & ignition coils?

Original plugs and coils with 245,600 miles. No issues since this happened.

 

[Charlie1982]

Original plugs and coils with 245,600 miles. No issues since this happened.

Wow, that's a lot! Might just be time for new ones. Or, if you're not having issues any more, maybe okay to wait a while, I don't know. But that's a lot of use out of those.

 

[jep604]

Wow, that's a lot! Might just be time for new ones. Or, if you're not having issues any more, maybe okay to wait a while, I don't know. But that's a lot of use out of those.

I agree, Sir. I read the required service info and the 7500-mile engine/oil filter change to me was ludicrous. I'm a firm believer in 3-4K mile interval. When I traded my 2006 V6 Sonata purchased new with 255K miles for this 2014 Genesis, it still had the original spark plugs.

 

[EdP]

I agree, Sir. I read the required service info and the 7500-mile engine/oil filter change to me was ludicrous. I'm a firm believer in 3-4K mile interval. When I traded my 2006 V6 Sonata purchased new with 255K miles for this 2014 Genesis, it still had the original spark plugs.

You change the oil at half the recommendation but let the plugs go 2 1/2 times what the manual states.

 

[jep604]

You change the oil at half the recommendation but let the plugs go 2 1/2 times what the manual states.

Yep! If it ain't broke, don't fix it! Just had the plugs replaced on my wife's 24-year-old SUV with 179K miles for the first time because a two of the eight failed. Did my transmission and rear diff before they were due and getting ready to do them again with new seals and plugs with a new pan filter/screen. I'm a 43-year aircraft maintenance professional with a FAA A&P-IA so I know what really needs to be done legitimately and "legally" in the real world. In the real world these both cars have given me world perfect records and service with some maintenance here and there and some repairs here and there. Half a million miles of outstanding service with one at 246K+ miles that brought me home tonight at 72-85 mph the entire trip of 57 miles.

 

[Charlie1982]

If you're that much of a mechanically inclined person, then I'm guessing you already know that the coils and plugs (or at least the one in cylinder #4) will always be suspect until they are changed, because they have been used so much. Not trying to be a smart-alek, and it sounds like you probably have more experience turning wrenches than I do, just pointing out (what I think is) the obvious. Then again, I've been wrong before, so take that for whatever it's worth...

Wishing you many more miles of trouble-free travel in all of your vehicles!