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P0303 Cylinder 3 Misfire Reports

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eee

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Discussion starter · #1 ·
Please post your P0303 reports here (year/miles), how you addressed the issue, and report back (with miles since original fix) if the fix worked.

I received a P0303 cylinder 3 misfire code on my 2011 Honda Odyssey at 89k miles. Replaced spark plug which resolved (I assume only temporarily) the misfire. Did some research which pointed me to VCM muzzler options. Just purchased S-VCM and hopefully will arrive soon before lengthy holiday travels. Here's an image of the factory installed plug that I replaced:
 
#3 ·
The misfire could be covered by extended powertrain warranty for up to 8 years from the original purchase date. Please refer to this thread for more details:

I cannot post a direct link now, but you can search for "misfiring covered by warranty" on this website under 2011 to 2017 Odyssey.

Good luck. Talk to a Honda dealer and they should be able to repair it under warranty, once they verify the P0303 misfire code.
 
#4 ·
qw2007 said:
The misfire could be covered by extended powertrain warranty for up to 8 years from the original purchase date. Please refer to this thread for more details:

I cannot post a direct link now, but you can search for "misfiring covered by warranty" on this website under 2011 to 2017 Odyssey.

Good luck. Talk to a Honda dealer and they should be able to repair it under warranty, once they verify the P0303 misfire code.
Click to expand...
That's a temporary fix. Permanent fix is disabling VCM.
 
#6 ·
eee said:
Please post your P0303 reports here (year/miles), how you addressed the issue, and report back (with miles since original fix) if the fix worked.
Click to expand...
Ugh, 45K and a search led me here. Haven't been under the hood yet as I just read the code and cannot believe a 2015 Odyssey with 45K on the odometer needs plugs already. Some chatter points to the VCM?
 
#7 ·
LadyRenegade4 said:
Ugh, 45K and a search led me here. Haven't been under the hood yet as I just read the code and cannot believe a 2015 Odyssey with 45K on the odometer needs plugs already. Some chatter points to the VCM?
Click to expand...
Do NOT change the plugs yourself. Do NOT clear the code. Do not do a damn thing except:

Take your van - misfires, Check Engine light, nasty spark plugs and all - straight to your friendly neighbourhood Honda dealer and let them diagnose the problem for themselves. Honda has been covering up to 90% of the repair costs that go along with VCM-related problems (even if you're out of warranty) but only if you play by their rules, and the start of the game is to let the dealer see the entire problem for themselves first.

Then after that, come back here to Odyclub and read up on VCM-related problems. It's a well-understood problem and easily solved by defeating VCM.
 
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#9 ·
Dealer still has my van, 2 working days later. They are going to rebuild piston 3 (rings) and have gotten approval from corporate to cover under the power train warranty. They say they're waiting on parts, though it was fairly obvious they were short staffed due to the July 4 holiday weekend.

Worth noting that the 2019 loaner has a push button to disable the economy mode.
 
#11 ·
Good Morning - I have a 2009 EX-L with 177K miles. 10 months and 15K miles ago I had the P0303 misfire. The Honda dealer replaced all 6 plugs and it worked fine. Well, it's back now. In between the episodes I learned of the class action settlement (my van does not qualify due to age. The dealer never even mentioned this...) and about the VCM disabler. My questions for this experienced group are:

1 - Should I change the plug myself according to the misfire code (is it cylinder #3 or the 3rd cylinder in the firing order?) and then install the VCM muzzler?

2 - Since I paid the dealer (too) good money to do this less than a year ago, is there a case to be made that Honda should pay for this?

Other suggestions?

Thank you - Jim
 
#12 ·
A2Jimmy said:
Good Morning - I have a 2009 EX-L with 177K miles. 10 months and 15K miles ago I had the P0303 misfire. The Honda dealer replaced all 6 plugs and it worked fine. Well, it's back now. In between the episodes I learned of the class action settlement (my van does not qualify due to age. The dealer never even mentioned this...) and about the VCM disabler. My questions for this experienced group are:

1 - Should I change the plug myself according to the misfire code (is it cylinder #3 or the 3rd cylinder in the firing order?) and then install the VCM muzzler?

2 - Since I paid the dealer (too) good money to do this less than a year ago, is there a case to be made that Honda should pay for this?

Other suggestions?

Thank you - Jim
Click to expand...
Almost wondering if you could get the same effect from a Seafoam treatment.

Sent from my SM-G960U1 using Tapatalk
 
#13 ·
jwzg said:
Almost wondering if you could get the same effect from a Seafoam treatment.

Sent from my SM-G960U1 using Tapatalk
Click to expand...
After changing out my #3 and #4 plugs and coils, I put in a can a Seafoam. All of that got me 450 freeway miles on the first day, and almost 300 freeway miles on the second day, but then the CEL came on and I blew a #3 misfire read again. So.....temporary at best.
 
Discussion starter · #14 ·
eee said:
Please post your P0303 reports here (year/miles), how you addressed the issue, and report back (with miles since original fix) if the fix worked.

I received a P0303 cylinder 3 misfire code on my 2011 Honda Odyssey at 89k miles. Replaced spark plug which resolved (I assume only temporarily) the misfire. Did some research which pointed me to VCM muzzler options. Just purchased S-VCM and hopefully will arrive soon before lengthy holiday travels. Here's an image of the factory installed plug that I replaced:

View attachment 144531
Click to expand...
Just wanted to post an update here which won't be a surprise to most. After changing spark plugs and installing S-VCM back in October 2018 at 89k miles, I am now 5yrs 3 months and 78k miles later, have had no more P0303 cylinder 3 misfire codes. Attributing this to disabling VCM.
 
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