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2004 ran fine yesterday, today every cylinder misfire

 
Old 02-03-2019, 03:42 PM
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2004 ran fine yesterday, today every cylinder misfire

I have a 2004TL with about 200k on it and I drove car yesterday and ran perfectly. Today when I started it had rough idle and when driving def feels like dropping cylinders and has CEL. Codes are po300 thru po306 ( every cylinder misfire) . Strange to have every cyclinder with no other codes for crank sensor or something else. Not sure where to start.
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Old 02-03-2019, 04:15 PM
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Water on/in ECU. Do a search, lots of threads.
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Old 02-04-2019, 10:11 PM
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Pulled console covers off and inspected ecu and looks dry and dusty. Reset codes, started it and watched live feed on scanner, hoped would see a singular cylinder misfire but got all 7;codes after a minute of two of idling.
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Old 02-04-2019, 10:40 PM
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Checking the coils and plugs might not be a bad place to start if you havenít done that yet

I had a Civic with oil all over one of the coils due to a bad valve cover gasket. CEL said misfires on all cylinders. Havenít had an issue with a misfire on my TL yet, though
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Old 02-05-2019, 11:36 PM
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Checked coils, not sure what readings should be but two pins measured around 1.7k ohm and all 6were close. Replaced all plugs and compression was around 150-170psi. No change.
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Old 02-06-2019, 05:20 AM
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perhaps bad cat?
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Old 02-06-2019, 05:41 AM
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Did you try disconnecting one coil at a time to see if it doesn't change, as far as I remember if one coil goes bad it'll throw the codes for all six.
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Old 02-07-2019, 08:33 PM
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I changed plugs and did a compression test. Plugs had some wear but nothing terrible. Compression was 170 across front and about 150in back but not sure I could get fitting totally tight in backside. I didnít try each disconnected one at a time.
Originally Posted by vpasla1 View Post
Did you try disconnecting one coil at a time to see if it doesn't change, as far as I remember if one coil goes bad it'll throw the codes for all six.
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Old 02-09-2019, 02:39 AM
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I messed with car more and it ran rough enough was tough to tell change when disconnecting coil packs but when I unhoooked #6;it impacted less than others. So took a shot and got used one from “you pull it” salvage yard and replaced it and reset codes. Idles smooth and drive it about 25 miles tonight and ran great. Not sure why one bad coil would make all 6 mis fire but I am glad it’s fixed. Car ( and I assume coills)have 200k on them and may buy a compete new set of OEM. ( I don’t typically love aftermarket stuff , lotta junk out there) Thanks for all the help, this site is great resource of knowledge.
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Old 02-09-2019, 09:19 AM
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Originally Posted by mnealuf View Post
I messed with car more and it ran rough enough was tough to tell change when disconnecting coil packs but when I unhoooked #6;it impacted less than others. So took a shot and got used one from “you pull it” salvage yard and replaced it and reset codes. Idles smooth and drive it about 25 miles tonight and ran great. Not sure why one bad coil would make all 6 mis fire but I am glad it’s fixed. Car ( and I assume coills)have 200k on them and may buy a compete new set of OEM. ( I don’t typically love aftermarket stuff , lotta junk out there) Thanks for all the help, this site is great resource of knowledge.
Common issue on J-Series engines, one bad coil will cause multiple misfire codes. My J30 equipped 2001 Accord had the same symptom; in my case I replaced coil #5 and all was well.
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