Hi,
I have a 2001 Honda accord with a 3.0L V6. It has misfire codes on all 6 cylinders (P0301-P0306) and (P1399) Temp random misfire. I have 308,000 miles. I did as compression test and I have 165psi on the lowest and 184psi on the highest. So compression is good. I did a cylinder balance test and found only one cylinder currently misfiring.

That cylinder is #5. I spark checked that cylinder, passed. I swapped spark plugs and that still didn't make a difference. Moving on........

With the engine running i pulled my stethoscope out and listened for the fuel injectors pulsing, passed. Moving on.....

I sprayed brake cleaner (with engine running) on #5 fuel injector o-ring area and #5 intake runner to check for vacuum leaks, No vacuum leaks found!

WHAT THE HECK IS WRONG WITH MY CAR????? ANYBODY HAVE ANY IDEAS????????

 

here is a code page that u may have found if not here is the link...

http://engine-codes.com/p0306_honda.html

i have found a honda civic forum as well about the same topic.... link below hope some of this helps.

http://www.civicforums.com/forums/21...1399-code.html

 

For giggles, did you swap the coil from #5 to another cyl. I know you stated you tested for spark but how strong was it?

 

Hi Lost again!
Thank you for responding. Yes I have swapped #5 coil to another cylinder and the the spark plug to no avail. Still the problem is with #5. I believe that the customer ran it out of gas and it might of pulled some crap from the bottom of the tank and some of that crud is caught in the #5 injector screen. Im going to pull the fuel rail to see. Thank you , Ross

 

Do a valve adjustment
I have had similar issues with mdx
Misfire on 1 cylinder no matter what i did prior to doing a valve adjustment after that it was ok

 

You know what Acrdr?
I think you are right. I just talked to my friend and he said he never has done a valve adjustment EVER! He has 308,020 miles and he bought the car new! Insane!!!He also has never done a timing belt either!!! Talkin about playin with fire!!!
Thank you for your response Acrdr!!!

 

Wow 300k on 1 timing belt and water pump?
No problem , hope it fixes it