What are these and how can I fix them? I am in the process of perfecting my tune with Vince, are these able to be tuned out?

 

Oh and also the car runs fine, boosts to 23psi and isn't stalling or sputtering or anything.

 

2187 is a lean condition and 2261 is associated with sticking bypass valve and or vacuum could be a vacuum leak,hose, tank or sticking and or torn bpv. The bypass valve is in the tan triangle on the turbo on the passenger side of the turbo. There are lots of posts about the bpv and a lot of memebers have went to the forge bpv. I would start by checking the bpv myself and go from there the 2261 stems from a fluctuation of boost the cel always occurs on the 2nd occurance same as a under or overboost condition does.

 

Usually what that p2187 code means is you have a boost leak. And the p2261 is your bypass valve is stuck. A boost leak will mean you're not getting all your power and probably overworking the turbo. I'd look for that problem 1st. The bpv problem can be fixed if its not torn. You can remove it and rub a little bit of motor oil on it. Not too much though.

 

I have an HKS BOV with a treadstone block off. Would that be causing that?

 

Also these codes started popping up right after my tune/BOV addition, so I don't think its anything torn, broken, etc.

 

Yes, you need a maf relocation for that. If you put your mass air flow sensor before the blow off valve or it will read incorrectly and be very hard to tune out.

Heres a link for one

Cobalt & Ion ---> ZZ Performance

 

Yeah search some posts here on it lots of info about that something about still keeping connected to the original bpv with a vacuum line or something. Has to do with block off plate and routing or something. None of the ss/tc's out here are running external so I do not know the routing myself. I am sure some people will jump in with external bpv's and help out also. assuming you did the maf relocate already ^ as Vince would have asked about that?

 

already done, ZZP maf relocation pipe.

 

Then, you should check the routing of your vacuum lines as the previous guy said.

 

Also, if I clear them, they both take hours before they come back on, sometimes a full day.

 

You will have the cels after two back to back pulls or two pulls. I pesonally would not be thrashing on it until you get it sorted out. Lean is bad lol.

 

Any chance this is related to the tune?

 

Check all your intake and charge pipe clamps. Also check your map sensor(the one on the lower chargepipe). Tighten the hell out of any of the clamps with a 1/4" drive ratchet on the couplers that are attached to metal. Be careful on the ones on the intercooler tho if you are running the stock one. You can crack the end tanks. Have you been datalogged after your mods, btw? If not I would get datalogged and retuned asap by your tuner. Thats probably your issue.

 

The only difference in vacuum line routing is instead of going to the BPV its now going to the BOV and I also added a catch can...

 

Yeah I have a synapse intercooler, I have data logged 3 times for Vince. I am waiting for the most recent tune to come back to me. The charge pipes are all tightened down VERY tight.

 

Well, I tell you what you could do if you don't get this issue resolved since these cars don't really like BOVs to begin with on the stock turbo. You can go sell all your stuff for the BOV that you bought and get a forge BPV. It fits in the stock location and theres no rerouting or blocking off. You will also never have to worry about it tearing since its made out of metal. It is also louder than stock and makes more of a BOV sound.

 

As much as I do appreciate the help, that is not going to be an option. The BOV is going to stay, there are a lot of people running them on the car with no problems.

I am hoping to just get the knowledge as to what the issue is and what will fix it (without removing the BOV). If a tune update could do it, I will start there. As for leaking boost, how can I test that?

 

MPx 2.5" Boost Leak Tester - 05-07 Chevrolet Cobalt SS Supercharged Blower Pulleys and Supercharger Accessori

Boost Leak Tester

 

If I were to bet on anything, its probably your tune, though. Almost all people running those are HP Tuned.

 

so 2187 is something that has to be tuned out, right? The 2261 is most likely a leak? Is that right?

 

I swear I think P2261 (Sticky BPV) is being caused your vacuum routing but it could also be tune related. I was thinking for P2187 (Running Lean) you were running rich for some reason(idk why) is why I thought you could have a boost leak. But instead you are running lean and I don't think Vince is taking into account that compressed air is being read across the maf sensor so the volume will look smaller to the mass air flow sensor. So that is almost definitely tune related.

 

So 2187 is a tune issue the other is possible vacuum line routing issue? Would this code pop up if I was leaking boost? or is it just from the vacuum lines?

 

Well, what I'm thinking is your computer is confused because it isn't getting the same type of response as it would from the stock bpv as a BOV does not recirculate the expelled air. I'm at best an amatuer mechanic man, I'm just telling you things you should check by common car knowledge using F/I.

 

hmm... ok thanks for your help so far. I guess I will wait and see what Vince from Trifecta says after seeing my most recent data log and CEL codes.