That's the message I received on my 2001 Odyssey when I had the check engine light diagnosed. This sounds like a HUGE deal to me. No repairs have been done; the tech thought it could be water in the gas. "Run the tank out and put in fresh stuff." He also reset the light.

I added Isoheat to the 60% full tank - I'm now down to a third of a tank, but that frickin light is back on. Am I in big trouble here? I'm out of warranty.

 

Dont consider yourself in HUGE trouble. These days gas seems to be getting cheaper and cheaper....Once you've run most of that gas out, and filled up with some new stuff, You can unhook your battery to reset the light or have a tech do it with one of those handheld units. It was probably the gas, if it wasnt then possibly its your spark plug wires, if one of them is going bad, it can cause a misfire. Just ideas

 

hmmm, I'm not sold on the gas yet. how many miles?

 

Possibly injectors.

 

I was talking to a couple Acura tecs friends of mine at the dealership yesterday about what problems I could expect from my 2004 MDX, and they gave me a tip that might help:

The engine (common to both platforms, regardless of model year) has a tendency to develop buildup in the EGR valve (exhaust gas recirculation). It is very easy to clean, and will probably fix your problem. Remove the top center cover of the engine (on my MDX its silver / gray). Use a ShopVac to vaccum out the debris - they refer to it as "ants in the engine" because of what it looks like. You can also use an air compressor to blow it out, but I'm not a fan of that idea. They also gave me a can of engine de-greaser that they use on a rag to wipe things clean.

When you get this buildup, it causes the engine to report misfirings.

 

BTW, in my browsing, I found this:
https://www.honda-acura.net/forums/s...ad.php?t=92971

Also, as it states in this post, emission controls are warrentied to 100k miles, and the EGR qualifies as emission controls.

 

The misfire is probably unrelated to the EGR. If it was a EGR problem, the dtc would be for a EGR not a misfire.
It is true that the J30,J32 engines have had EGR service bulletins for port clogging but I have never seen one throw a dtc for misfire and be related to an EGR port clogging or a bad EGR. Trust me the ECU/PCM isn't that dumb. When it moniters for misfires it's watching the crankshaft's rotational velocity(measured in crankshaft angle degrees per second and converted to revolutions per second/ RPM) via the Crank position sensor/s, cyl 1 sensor/s.
When it sees a rapid decrease in RPM (misfire event) it judges the severity and sets the code accordingly. What that car is trying to say is hey my pistons in these cylinders are slowing down more than the others, There is a lack of combustion, fix it.

I've been doing this for awhile, it's something else bro. Try looking at your basic's in those cylinders. I would check the fuel pressure regulator. I have seen a couple go bad and cause those exact codes before. How are the plugs in those holes????

 

True I second that

 

The first thing the manual says could be the cause is, low compression on those cylinder's, bad fuel pressure regulator, bad injector, bad coil/wire/spark plug.