Installed oil catch can - CEL light came on

[magagal]

2016 114K miles. Should I be concerned? It makes no sense why there would be an issue other than the system being ultra-sensitive. Should we ignore it or bypass the catch can, get the tune and try again? Any experience with this? (I tried finding an existing thread on this topic and nothing was obvious).

 

[Tremper126]

It’s a common occurrence with this mod for some reason. Some haven’t had a code but most do. Some have found oversizing the lines have helped the code

 

[SeanPwnery]

Question, what line did you install the can in between? I'm considering doing this on the PCV side of the system since my tune already closed off the EGR.

 

[Tremper126]

I’m unaware of anyone who has done it on anything other than the pcv side as the idea behind it is to stop oil from cycling through the intake air side of the turbo.

 

[magagal]

Question, what line did you install the can in between? I'm considering doing this on the PCV side of the system since my tune already closed off the EGR.

from husband: because it comes from the crank case, goes into the oil catch can then into the intake it has to go on the PCV side. We had the EGR and DEF delete and tune done after the oil catch can).

 

[magagal]

It’s a common occurrence with this mod for some reason. Some haven’t had a code but most do. Some have found oversizing the lines have helped the code

Once we get the EGR and DEF delete and tune the CEL light went away permanently.

 

[John Jensen]

What Tremper said, "It’s a common occurrence with this mod for some reason. Some haven’t had a code but most do. Some have found oversizing the lines have helped the code."
A larger line usually corrects the problem. However, you did not say what CC you installed. There have been several that no matter what was tried, they failed.

 

[EcoRama]

Living in California, most vehicles are required to pass emissions every 2 years. And if you have any tunes or non-stock options it’s an automatic fail. I run a pre-GDE tune and an oil catch can & truck runs amazing: no turbo lag, no hesitation, better fuel economy, just an overall great truck. But the second I put the stock pcm back, the CEL came on. SMOG guy said I probably had to drive it went thru its cycles which might take 200 miles. I also had to get the Z46 & 66a recalls done before registration could be renewed. Fortunately I had some incredible luck & the dealer service got my truck in & finished both recalls within 2 days. But then it sat there another week before they figured out one CEL was caused by the oil catch can.
And for only $738.00 they could replace the hose I cut with a new stock hose.
Not sure if they saw a sucker stuck to my forehead but I declined that repair & just used hose clamps to temporarily bypass the cc and after another 75 miles the CEL finally went off.
Clearly the parameters are set so tight that the smallest fluctuation in pressure will cause a CEL.
Finally after a month of driving, what felt like a different truck with its unsafe acceleration lag and multiple CEL’s, it was able to pass emissions - barely. But now it’s back to purring like a fine tuned GDE cat that doesn’t cause me concern while driving.
I don’t understand why you can’t opt out of the plug in emission test and have the vehicle tested for what actually comes out the tail pipe - the old fashion way. Isn’t that the whole point of the emmision test to measure what crap the vehicle emits?

 

[John Jensen]

I don’t understand why you can’t opt out of the plug in emission test and have the vehicle tested for what actually comes out the tail pipe - the old fashion way. Isn’t that the whole point of the emmision test to measure what crap the vehicle emits?

I was told by a Califunny smog equipment inspector that sniffing a diesel with the gas sniffer will ruin the sniffer. And a diesel sniffer has been developed, he didn't know why. Even if they could sniff a diesel they still have the requirement to check for non CARB approved aftermarket parts and excessive smoke

 

[EcoRama]

I was told by a Califunny smog equipment inspector that sniffing a diesel with the gas sniffer will ruin the sniffer. And a diesel sniffer has been developed, he didn't know why. Even if they could sniff a diesel they still have the requirement to check for non CARB approved aftermarket parts and excessive smoke

But how do they check the older diesels from the 90's that might not have computers that monitor every system?

 

[John Jensen]

But how do they check the older diesels from the 90's that might not have computers that monitor every system?

They check for non CARB approved aftermarket parts and excessive smoke