California emissions and cat question

[Simple_serf]

So I took my truck to the shop I normally have do work that I don't want to do or can't do, for some brake work and to repair my exhaust which pretty much fell apart on my trip. Tech at the shop found my front cat to be cracked. Apparently (and sort of, ironicly) my truck is a california emissions vehicle. Now the diagram for federal and the diagram for calif. are the same except for the number of cats. Our concern is that the computer might not like what it sees without having the california cat setup. I'm guessing that the twin setup is more efficent.

Any ideas?

 

[MAKG]

I'm surprised there is a difference. Two-chambered cats are typical on Ford trucks. Or do you mean there is one cat for each bank? If that's the case, you really need two cats or you won't be able to plumb it correctly, especially related to the oxygen sensors (A single cat for OBD-II requires 3 HEGO sensors; two would require 4).

If the tech is having ANY trouble with this, go somewhere else. It's not like getting these parts is hard.

 

[Simple_serf]

My truck is a 4 banger. There is a sensor in the manifold, and then another after the two cats.

The part coming from Napa is supposed to work on this truck, But I do know that california vehicles can have different computer parameters...I wasn't sure if there was a difference in the cats.

Following my line of thinking...IF there is a difference in the cats, that means that the downstram o2 sensor isn't going to be seeing what it likes...and if the computer is different that could make things interesting.

The plan is to put the part on that we can get (single cat....in one can). The two piece part is availiable through Ford. With a Ford price. The problem we are having is finding the right part, not figuring out where there should be a cat.


BTW... The ford dealer installed the brakes improperly, Didn't adjust them, and left air in the system after they replaced the shoes from the axle seal blowing...No real reason to open the system. Nice....That's all I can say.

 

[MAKG]

All downstream sensors do the same thing -- look for a nice smooth signal at about 0.5V after the cat. That's not the issue.

Fitment might be. You REALLY do NOT want anyone welding on your exhaust system near the cat. It's a PITA and almost everyone who tries this screws it up. And the welds rust.... RBV cat flanges are not generally round; that's the issue.

I'd suggest going somewhere else.

 

[Simple_serf]

Yeah, I know, they use the oval pattern.

The part we ordered bolted right up to the manifold, so no welding was required.

Are there any differences other than the cat on a calif. vehicle?