This seems likely. If the vehicle cannot breathe than it will create a host of issues. I would definitely take off the cat and see if it's clogged up. These odysseys are pretty notorious for it because of the oil consumption. It will be the third cat under the vehicle not the ones coming off the motor. Take it off and start the vehicle and let it idle. It will be obnoxious but, of it runs steady than you know the issue or once you take it off you can see its clogged. Replaced with another converter not a flex pipe since there is already one on it.

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This seems likely. If the vehicle cannot breathe than it will create a host of issues. I would definitely take off the cat and see if it's clogged up. These odysseys are pretty notorious for it because of the oil consumption. It will be the third cat under the vehicle not the ones coming off the motor. Take it off and start the vehicle and let it idle. It will be obnoxious but, of it runs steady than you know the issue or once you take it off you can see its clogged. Replaced with another converter not a flex pipe since there is already one on it.

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Thanks so much, Odyssey Man--like the image

 

What trim level? VCM probably killed your catalytic converter.

 

I think it does have the VCM. I know it has some type of high performance V6

 

Head gasket failure is extremely uncommon on this engine and is usually caused by some kind of other failure like overheating.

VCM will definitely kill any new catalytic converter you put in. Disable it first.

 

Was lining up someone to take the back cat out and see if it is the problem. Talking with a mechanic that works in a Honda repair shop and he said it's the first two cats that go bad first. I was hoping to have this guy work on it but he said did not want to touch it. Anyway, is it likely that the cats up near the engine are bad also? Or they are the ones that are clogging the system up and that I will not likely fix the problem with repairing the second cat?
thanks

 

What can happen is the first catalytic converter near the engine fails, and then the second catalytic converter gets clogged up with the remains of the first one.

 

Thanks, so hopefully by fixing the second cat I can get it running.

Should be able to do that this weekend

 

well, that back cat was full of stuff. It was amazing that the van ran at all.

Anyway, replaced it with a pipe --like I said just needing it to last til end of year.

It is great having transportation again

thanks for your help/posts

 

Probably filled with remains from the front cat.

 

I went thru this problem a few months back. I just gutted all my cats since they were all clogged anyway. Are you experiencing any smoking? What about a foul smell? I’m having both. I think the cats were hot enough to burn the oil on the way out, but not now.

Also are you getting a CEL light?

 

I went thru this problem a few months back. I just gutted all my cats since they were all clogged anyway. Are you experiencing any smoking? What about a foul smell? I’m having both. I think the cats were hot enough to burn the oil on the way out, but not now.

Also are you getting a CEL light?

Yes, I am still getting a CEL but had that before the cat got clogged because of a head gasket leak.

However, I think I fixed the head gasket leak for a while--it is not using any coolant or very little. But after getting the cat replaced with a pipe I soon started blowing smoke and using oil. From comments above, it sounds like my piston rings were also likely to go bad and it seems they have--or some of them. A mechanic recommended using Blue Devil Stop Smoke along with Prolong Engine Treatment.

 

Since you think it was the rings did you ever run it to like 3k rpms and notice a difference in the smoke? Mine stops smoking altogether if i rev it up. Which makes me thinks its the vacuum system or valve stem seals, but i can’t figure out which.

I wonder what the correlation to using oil without the cats is.

 

I plan on canceling the VCM tomorrow if I am able to figure how to do it with a you tube video or other help info.

 

The only way to disable the VCM is to purchase an aftermarket VCM Muzzler device, such as the VCMuzzler or VCM Tuner II. There are others as well. Easy to install. Costs around $100.
Read through the first parts of this thread:

PISTON RINGS/MISFIRES/FOULED SPARK PLUGS - The VCM mega...

This thread explains all the key details regarding VCM. Rather than re-explaining everything about VCM to every new forum member, they can simply be directed here. Self-service FTW! While there will be plenty of discussion in this thread, this first post contains the key information, so reading...

www.odyclub.com

 

The VCMTuner II has a good install video on YT made by the creator himself.

 

I was all ready to disable the VCM today...

Will order the VCM tuner today or tomorrow
I put in the Blue Devil Stop Smoke--it didn't Stop Smoke. It's burning a quart of oil every 80 to 100 miles
Thanks

 

The VCM should not engage when the CEL is on. It sounds like there are other things wrong with the engine. I suggest having a trusted independent mechanic look at it to see what can be done to save it.

 

Are you saying that my VCM is not engaged if my CEL is on. My CEL is continually on except once in a while it blinks. So it sounds like there is no need to install the VCM tuner until I can get the CEL turned off. Is that correct?
thanks

 

A blinking CEL is usually indicative of a misfire which isn't exactly good. You'd be correct, assuming of course that VCM isn't the cause of the CEL.