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I would pull the plugs. label them from what cylinder they came from and look at them to see how they are burning..the plugs should look whitish in color.
if you see fouling you can do a compression test on any suspected cylinders. if all checks out with plug reading get a spark plug tester. one by one check
your spark. (If you can pull the stored codes to help you in your diagnostic.) If spark checks out.fuel pressure is next. then fuel injector test. Eric has a good
video on this..good luck and keep us posted.That engine is famous for the EGR passages clogging in the top of the intake and causing misfire codes and poor mileage. It’s easy enough to fix, just remove the upper plate of the intake and clean the ‘ant farm’ out and the holes that go into the individual cylinders and then reset the CEL.
Do you know the codes for your CEL(s)? I would point more towards a faulty O2 sensor on that bank which would explain excessive fuel consumption. When’s the last time you had a tune up? I would deffinatly consider throwing a set of plugs in it if they haven’t been done in a while. An old tired plug would possibly cause a missfire. Also check the part of the coil that goes down through the valve cover for any cracks or “burnt” spots. This would be where the spark is jumping to the engine instead of the sparkplug. Also make sure you have a new/clean air filter. That could also affect your fuel economy.
Quoted From EricTheCarGuy:
That engine is famous for the EGR passages clogging in the top of the intake and causing misfire codes and poor mileage. It’s easy enough to fix, just remove the upper plate of the intake and clean the ‘ant farm’ out and the holes that go into the individual cylinders and then reset the CEL.
think i recall you doing that in a video eric . i will try that and the plugs are 2 month’s old first thing i figured and it seemed to run better put a knn filter in as well runs strong but horrible fuel economy . egr cleaning time i’ll try to post a pic of the print out see if that makes any more sense to people thanks again i’ll keep every one updated
http://www.flickr.com/photos/74287903@N02/6692779449/ here is a link of the scan i had done on the car when i brought it back to the trans shop because they forgot to put my car fully back together and then to add insult to injury they couldnt get it to start and being its so low to the ground since who ever owned it before me lowered it 3 inchs almost they broke a hole in my bumper cover some how yay me
http://www.hondapartsnow.com/diagrams/large/intake-manifold-v6-at-466260.png on the pic im taking 4 off and what holes am i cleaning for the egr ? i guess any that look dirty or does it matter if i get the cleaner in the wrong hole ? thanks again every one and i’ll keep you posted
I have a 05 Accord V6 and have done this job in the past. Yes, item #4 is the cover plate for the EGR passages or “ant farm” as Eric mentioned in his post. They are the horizontal passages that you see after removing the cover plate. Usually blocked with carbon, just spray with throttle body cleaner and scrape with a pocket screwdriver as needed. Also clean the vertical ports, you will see what I mean once you remove the cover. Remove also the item # 7 crossover pipe by unbolting #16. Clean the interior of this pipe. When reassembling the cover plate start from the middle of the plate, go in a criss-cross pattern with the reinstall of the cover plate bolts. Do not over tighten bolts.
One other item to check and possibly replace, the pcv valve. It’s located under the front passenger side plastic cover for the plugs. Odd design, inserted into the block and held in place by one 8mm bolt. Costs about $20 at the Honda dealer, not available at the local parts store.
Keep us posted on how this goes and the affect on your gas mileage.
thanks fitone i started to half ass clean it today then some junk came up i had a pic im going to post it didn’t look to bad if you ask me i figured a little worse if any thing .i’ll keep every one up dated and get on the pcv valve almost forgot i wanted to replace that
[url=http://www.flickr.com/photos/74287903@N02/6699646247/:1u5qyc4l]http://www.flickr.com/photos/74287903@N02/6699646247/
s[/url]orry i cant get the site to let me add pics
I took a look at the picture you had posted. Not to bad, I was expecting to see a lot of carbon build-up. My Accord looked about the same at 75K miles. But I would clean as mentioned earlier. Check the vertical ports (holes) as Eric mentioned in his post and see if they are clogged, but from the picture they look OK.
i know its seemed pretty clean i didn’t get a chance to take off that piece and clean it yet but i’ll do it when honda gets in my pcv valve
Quoted From fitone:
I have a 05 Accord V6 and have done this job in the past. Yes, item #4 is the cover plate for the EGR passages or “ant farm” as Eric mentioned in his post. They are the horizontal passages that you see after removing the cover plate. Usually blocked with carbon, just spray with throttle body cleaner and scrape with a pocket screwdriver as needed. Also clean the vertical ports, you will see what I mean once you remove the cover. Remove also the item # 7 crossover pipe by unbolting #16. Clean the interior of this pipe. When reassembling the cover plate start from the middle of the plate, go in a criss-cross pattern with the reinstall of the cover plate bolts. Do not over tighten bolts.
One other item to check and possibly replace, the pcv valve. It’s located under the front passenger side plastic cover for the plugs. Odd design, inserted into the block and held in place by one 8mm bolt. Costs about $20 at the Honda dealer, not available at the local parts store.
Keep us posted on how this goes and the affect on your gas mileage.
Edit related to the pcv valve, its a 10mm bolt and after you remove the plastic cover the pcv valve is located just below the dipstick. Remove 10mm bolt and remove pcv from engine.
thanks again fitone youv’e been a big help hopefuly i’ll get some time tomorrow and re clean every thing and do the pcv valve
PCV valves are rarely a problem but I’m happy to hear that you are using an OE unit. Also I don’t think that’s going to effect your fuel economy at all but the EGR will.
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