355 Struggling with Intermittent 1211 codes and failed smog

Did you smog the car?

 

Hi Joe,
Can you post the passing numbers/smog report?
Thks

 

So you went all the way from 8.30% CO down to .02% CO just because the bypass valve wasn't getting vacuum?

 

Looks about perfect for these NICE !!!!!

 

A little confused (again ) 95 with a 2.7 and you applied vacuum to the bypass valve to CLOSE it? I'm pretty sure my bypass valve is normally closed, and needs the solenoid to apply vacuum (under the right conditions) and open it. I can clearly understand that an open bypass valve will cause tailpipe emissions to be elevated.

 

John, you must have missed that it has a Capristo bypass valve.

 

Block it off for testing

also you did not mention your cats if they cool off too much it also causes problems on the 25 test\

 

Responded before reading great you got it solved

 

I saw a lot of weird stuff on 2.7 355 and 348, but this is a very obscure case. Good going Tim and Michael.

 

Ok. So the Capristo is normally open and uses vacuum to keep it closed?

 

Correct. It failsafes to open, to protect the engine.

 

I don't know if it protects anything. 90% of 355 do not have Capristo and the stock valve is reverse of that.

 

I heard that that's why all later cars have Capristo-style valve/control logic (360, 430, etc). Wouldn't you get a greater heat build up in the exhaust system if the bypass didn't open at high rpm?

 

The function of the capristo valve open/close is the same as the stock. Meaning, the path is open when RPM is above 3000 RPM and is closed below that. How it is opened or closed with or without vacuum is reversed.

 

Does the Capristo valve open if electrical power is lost?

 

Yes, it is normally open. It requires vacuum to close at idle.

 

So, in essence, the Capristo system does behave in the same way as the 360 system. No power or vacuum = open.

 

Not sure what ferrari is thinking but I like that way
Mine actually has two valves one on each bypass and it closes extremely quickly after start up I would say less than 5 seconds
I have had 2 vacuum leaks and I knew before even taking the car for a drive which was nice as far as I was concerned

any owner who does not realize their valve is not working likely does not drive hard enough that protecting the engine if that was true would not matter
It is totally obvious I think to most of us but who knows for sure