Car works on 3 cilynder

you can hollow out the cat by taking it off so you can access both ends of it. Then take a long rod to punch the honeycomb stuff out, making sure you get every single piece out. Then put the cat back on.

I would advise reading back through this thread and really think about what is the cause of the problem. A lot has been said, and keeping the examination simple and most importantly thorough is important so that no efforts are wasted.
This is frustrating that your local shops are not able to assist you without running up unfair charges. Communication seems to be a bit of an obstacle as well, not wtih us but with your local wrench heads.

Ok, so this weekend I'm going to see what can I do.

The difficult on cat is that I'll need to reach under car and could be a little dangerous without good stuff. I only have 2 wrench crick original honda that normally should use only for upping car and change tires.

Hi!
Sorry for my disappear but I had to hard work for my thesis degree :)

For the car, at the end was a bad head....It was need a completely head rebuild cause all guide valve was very very messy and so other small problems relatives to head. So I can say this is a solved issue.
Now the problem is the head gasket replace part. I had purchase a 2 complete kit: the one from A18A1 (thta IS NOT a A18A at all) Prelude and all parts not fit at all on my car and the one form A20A1 Accord where only head gasket not fit cause diametry pistons are bigger. Adding the kit lack about intake gasket...damn ebayer.

Now intake gasket is not a problem I can find it, but head gasket is a BIG problem. The OEM code for my Accord A18A, found on japanese electronic catalogue it say 12251-PH1-003 the same as A16A one (don't ask me how could use the japanese electonic catalogue :D finally my 10 digit VIN was helpful, u know this car hasn't a standard 17 digit VIN).

The only choice is to go at very expensive honda dealer, cause on ebay find part for A18A or A16A is impossible.