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Started By
Message
Help with car problem
Posted on 9/9/23 at 11:59 am
Posted on 9/9/23 at 11:59 am
My wife has a 2008 Honda accord v6 with 208k miles. In last year, we have replaced the spark plugs and ignition coils because the check engine light keeps flashing and is real rough. We keep replacing the ones that the obd2 scanner pulls up. What would be another cause for it to keep misfiring?
24
Posted on 9/9/23 at 12:00 pm to Byrdybyrd05
Are you using gas or diesel?
Posted on 9/9/23 at 12:04 pm to Byrdybyrd05
How about the cables?
Posted on 9/9/23 at 12:05 pm to Byrdybyrd05
quote:How many times have you replaced them and at what mileage intervals?
We keep replacing the ones that the obd2 scanner pulls up.
Posted on 9/9/23 at 12:05 pm to Byrdybyrd05
Did that obd2 scan tool suggest EGR?
Posted on 9/9/23 at 12:10 pm to Redbone
Throughout the past year, we changed all of them changing two at a time that the obd2 would say that was bad. It happens about every 2-3 months. Bank 3 and bank 6 I know we have changed twice already. Cables are fine and it did not suggest to change the EGR.
Posted on 9/9/23 at 12:11 pm to Byrdybyrd05
Put a piece of black tape over the light. Problem solved.
Posted on 9/9/23 at 12:17 pm to Byrdybyrd05
quote:
American Honda Motor Company settled a class action lawsuit in 2014 over a misfiring 3.5-liter V6 engine. It’s a measure that included an engine warranty extension for more than 1.5 million 2008-2012 Accord, 2010-2011 Accord Crosstour, 2012 Crosstour, 2008-2013 Odyssey, and 2009-2013 Pilot models.
LINK - Honda Engine Misfire Warranty Extensions – What You Need to Know
Could be covered by extended warranty at the dealership.
Posted on 9/9/23 at 12:31 pm to POTUS2024
Worn timing chain ?
Posted on 9/9/23 at 12:32 pm to Byrdybyrd05
Fuel injectors. Try those next.
Posted on 9/9/23 at 12:32 pm to POTUS2024
Just changed the timing belt and water pump 2 weeks ago
Posted on 9/9/23 at 12:35 pm to Byrdybyrd05
Bad catalytic converter. Partially plugged.
Posted on 9/9/23 at 12:36 pm to Byrdybyrd05
Sounds like the VCM is fouling your plugs.
Get a VCM Muzzler.
It keeps all of the cylinders firing all of the time.
You might lose 1-2mpg.
I have it on my Odyssey, where this is a very common problem.
Get a VCM Muzzler.
It keeps all of the cylinders firing all of the time.
You might lose 1-2mpg.
I have it on my Odyssey, where this is a very common problem.
Posted on 9/9/23 at 12:39 pm to Byrdybyrd05
quote:
What would be another cause for it to keep misfiring?
Not to question your intelligence, but did you check to see that there actually was a misfire at each location indicated, or did you just trust the sensor (OBD2 readout)?
Posted on 9/9/23 at 12:43 pm to Byrdybyrd05
Did you use NGK spark plugs?
Posted on 9/9/23 at 12:44 pm to guzziguy
quote:
Sounds like the VCM is fouling your plugs. Get a VCM Muzzler. It keeps all of the cylinders firing all of the time. You might lose 1-2mpg. I have it on my Odyssey, where this is a very common problem.
Good suggestion to check the VCM.
Posted on 9/9/23 at 12:45 pm to Byrdybyrd05
Could be the piston return springs or muffler bearings. Hard to know without doing a complete teardown
Posted on 9/9/23 at 12:47 pm to guzziguy
With the VCM as stated combined with the oiling issue, a plug(s) intended to be firing when the VCM is active may be fouled sufficiently for the CPU to shut down the injector(s) to cause the lumpy running. 
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