[2023_ZL1-AUTO]

Weird issue this morning and again about an hour later. I only have 110 miles on my car since Katech did the rest of my build. They added a 9.45" lower, THPSI port injection, Katech dual fuel pump and new fuel lines and a few misc. other items. Just before taking my 2023 ZL1 Auto to Katech. I also had the blower Kong X-ported, added a Kong NW 103mm TB and a Griptech 2.3 upper. Car has been driving flawlessly since picking it up from Katech, until today.

But today, something really weird happened while doing a few freeway pulls from 3rd gear through 4th etc. Did four hard pulls and during the last pull, I was in 3rd at 2700rpm, hit WOT and the car took off great. Then, all the sudden the car acted like someone killed the power for a split second. Then it was like someone flipping the power back on and it recovered. Kind like the car went dead for a second and then acted normal again. I thought maybe the tires spun and it quickly hit rev limiter then shifted and continued. Got home and parked it in the garage.

About an hour later, I decided to try and see if I could repeat the issue. When I started the car this time. A big cloud of gray oil smelling smoke blew out the exhaust all at once. Kind of like it did when I was having catch can issues and all the oil was building up under the lid of my blower. The smoke cleared and I went on the drive. Snapping the pedal hard here and there for quick acceleration /rev, all felt fine. Got on the freeway and did a 4th gear pull from 2500rpm to 6600rpm and all was fine. Then got onto a long on ramp and was in 2nd, smashed WOT and again, the problem happened.

Came home and let the car cool off. I decided to check the catch can and drain any oil that might have accumulated. WOW, was I shocked! These photos are after only 110 miles of driving the car, hard since having the new catch can installed. I'm not sure if the tuner or Katech emptied the catch can after the Dyno tuning or not. But this is a lot of liquid, not think but very runny.

I'm wondering if when I hit WOT during those pulls when the issue happened. If somehow under the rapidly increased of boost to 20psi. With having that much oil in the catch can, could it have pulled the oil vapor liquid out of the can and into the intake and this is what triggered the split second issue? I plan on trying a few pulls again later this evening now that the can is empty and will also data log.

[ZLRob]

Originally Posted by 2023_ZL1-AUTO

Weird issue this morning and again about an hour later. I only have 110 miles on my car since Katech did the rest of my build. They added a 9.45" lower, THPSI port injection, Katech dual fuel pump and new fuel lines and a few misc. other items. Just before taking my 2023 ZL1 Auto to Katech. I also had the blower Kong X-ported, added a Kong NW 103mm TB and a Griptech 2.3 upper. Car has been driving flawlessly since picking it up from Katech, until today.

But today, something really weird happened while doing a few freeway pulls from 3rd gear through 4th etc. Did four hard pulls and during the last pull, I was in 3rd at 2700rpm, hit WOT and the car took off great. Then, all the sudden the car acted like someone killed the power for a split second. Then it was like someone flipping the power back on and it recovered. Kind like the car went dead for a second and then acted normal again. I thought maybe the tires spun and it quickly hit rev limiter then shifted and continued. Got home and parked it in the garage.

About an hour later, I decided to try and see if I could repeat the issue. When I started the car this time. A big cloud of gray oil smelling smoke blew out the exhaust all at once. Kind of like it did when I was having catch can issues and all the oil was building up under the lid of my blower. The smoke cleared and I went on the drive. Snapping the pedal hard here and there for quick acceleration /rev, all felt fine. Got on the freeway and did a 4th gear pull from 2500rpm to 6600rpm and all was fine. Then got onto a long on ram and was in 2nd, smashed WOT and again, the problem happened.

Came home and let the car cool off. I decided to check the catch and drain any oil that might have accumulated. WOW, was I shocked! These photos are after only 110 miles of driving the car, hard since having the new catch can installed. I'm not sure if the tuner or Katech emptied the catch can after the Dyno tuning or not. But this is a lot of liquid, not think but very runny.

I'm wondering if when I hit WOT during those pulls when the issue happened. If somehow under the rapidly increased of boost to 20psi. With having that much oil in the catch can, could it have pulled the oil vapor liquid out of the can and into the intake and this is what triggered the split second issue? I plan on trying a few pulls again later this evening now that the can is empty and will also data log.

Jesus! That's a little over 1/4 lb of oil you emptied from your catch can! What kind of can are you using? I have heard some of them have issues with drainback. It may have been. If I remember right I recall reading something about an anti drainback valve needing to be installed on one of them. It may have been Mighty Mouse, but I'll leave this one to the individuals who run something outside of stock in theirs. I run the OE unit on mine still.

Katech should have drained the CC during the build though. If they didn't it was either a tech goof up or they didn't touch it at all, both of which are slightly concerning considering all that has to come off during a build anyways.

[Z OH 6]

Considering Katech did your build, no one here should really have to answer to what happened. Katech will be along soon enough though to address it if you haven't reached out to them directly. With that much oil in the CC though it really seems like the reducer wasn't installed to limit oil suction from the valve covers assuming they installed aftermarket valve covers.

[Mark114]

Originally Posted by 2023_ZL1-AUTO

I decided to check the catch and drain any oil that might have accumulated. WOW, was I shocked! These photos are after only 110 miles of driving the car, hard since having the new catch can installed. I'm not sure if the tuner or Katech emptied the catch can after the Dyno tuning or not. But this is a lot of liquid, not think but very runny.

If the liquid in the catch can is thin and runny then that could be an indication of a problem with the oil. I would check the engine oil level and viscosity to make sure something hasn’t happened to cause a problem with the oil.

[2023_ZL1-AUTO]

Originally Posted by ZLRob

Jesus! That's a little over 1/4 lb of oil you emptied from your catch can! What kind of can are you using? I have heard some of them have issues with drainback. It may have been. If I remember right I recall reading something about an anti drainback valve needing to be installed on one of them. It may have been Mighty Mouse, but I'll leave this one to the individuals who run something outside of stock in theirs. I run the OE unit on mine still.

Katech should have drained the CC during the build though. If they didn't it was either a tech goof up or they didn't touch it at all, both of which are slightly concerning considering all that has to come off during a build anyways.

So, Katech installed the new MM Catch Can. I know this was "empty" when they had the car since it was newly installed by them. I'm just not sure how much would build up from Dyno / tuning or if they did a final can dump. They also did a complete oil change as well. So checking my oil now would be a good idea! At this point, the CC is empty now, so I'll do another pull later and data log as well! Thanks for the info, I know that Elite Catch Cans all come with check valves and my new after market valve covers have full baffles.

[Megahurtz]

Just keep in mind that the oil issue you're having may not have anything to do with the power cut issue you're having. It may just be coincidence.

Question. Have you datalogged the car to see whats actually going on? That would be very beneficial to datalog, with all of the proper PID's, to actually see what the ECU is doing.

As for that much oil, that seems excessive. Do you valve covers have baffles in them? Are you using the MM Wild setup? There are some valve covers that don't have the proper baffling and will just fill up the catch can real quick with the MM Wild setup. Ingesting oil from the catch can on a rip wouldn't cause the power to cut. I mean not unless it was a ton of oil at once in all cylinders. Seems unlikely.

[WhiteMale]

Any codes or data logs?

[XXX ZL1]

The aftermarket valve covers offer very little baffling and they will pull more oil in through the can. Just fought it with DSX covers and MM PCV can on a friends car. We tried a restrictor on the inlet and it still pulled too much oil. We ended up just deleteing PCV and doing a MM Race can that just a vent.

[2023_ZL1-AUTO]

Didn't quote multiple posts above since I’m answering several at once.

The new valve covers are fully baffled, they are the TooHighPsi LTx Billet Valve Covers.

I've not data logged yet because I ran short on time yesterday, but will do so this evening. Also, no check engine light. I hooked up my Foxwell NT809TS scanner and ran a diag., but no new codes.

The newly installed catch can is a MM Wild 1000HP setup. The MM vents 2 connections, and doesn't connect to the air intake elbow like the Elite EX-2 did. I looked back at a photo I posted after picking the car up from Katech. I noticed that one of the stock evap box connectors go to the intake elbow. With that set up, not sure how any oil could even make its way into the intake/blower?

Sunday, when smoke came out of the exhaust in a big cloud on start up. That was the first time it happened since replacing my original Elite EX-2 with the MM Mild 800HP. When I installed the Elite EX-2 it was with non-baffled valve covers and I had a lot of oil accumulating under the blower lid. Most startups, there was always grey oil smelling smoke that would come out all at once from the exhaust. I then switched to the MMCC Mild 800 with the same non-baffled valve covers. But all was good, no more oil under the lid and no more smoke at start up.

I checked the oil, and it looked right on the full line, maybe a line width under. I'm using the recommended GM oil for my car. When I wiped the oil off the dip stick on to a white napkin. It looked thin’ish, light brown colored with maybe a slight greenish tint to it, slight bit of darker streaking on the napkin. I'll drain the oil and look at it after I get a pull and data log and see if the problem happens again. If the oil had a viscosity problem, would my oil pressure gauge show this? I was keeping my eye on it and it was running normal the entire time.

With it extremely hot, could the fuel line somehow had an air bubble that passed through the fuel line?

Thanks, and I will report back!

[rcoe]

If you are running the MM as a mild version I do not think the dirty line should be going to the valve cover but rather the valley where the OE pcv was located.

I have struggled with catch can issues using a MM in the wild form, especially when on track days or anytime really flogging the hard with extended periods running high rpm's then closing the throttle quickly when hard braking going into a turn. Mine would fill the catchcan and then backfeed into the intake and at times come out the top of the MM.

I changed mine from the inlet being the valve cover to the valley gutting the OE pcv valve. This seems to work much better for my setup and when on a track day I plan to switch out the vented top to a sealed top.

I don't think this vents quite as well under boost, but I am only hitting 11psi max and I turn that down on track days. I am betting you are hitting much higher boost than I am.

I found quite a bit of good info about catch can setups in the C7 vette forums.

[rcoe]

Also might want to double check the can to make sure it is configured correctly. The valve inside the MM can be rotated to make the ports usable for different feeds. Basically the port that you can see the fill material in should be going to the dirty side. Mine was rotated so on the outside it looked good, but on the inside it was rotated so the port above the sight window was supposed to be the clean side vac.

Another that I am not sure about but if you are running E85 or flex that might contribute to more vapor getting into the can making the oil kinda runny? I know my can seems to fill faster now that I am running E50 than when I was on straight 93.

[RobZL1]

I'm with Jason. You really need a data log to catch it happening. Could be closing the throttle blade or pulling timing (or both), could be getting a momentary fuel pressure drop causing it to go lean and recover. Just need to see it in a log to know what's really going on.

[RobZL1]

Regarding oil in the can, I think it's coming from the oil fill connection to the valve cover. No baffling there I imagine, so it's just pushing oil straight to the can in copious amounts. If you upsize the lines from the valve covers to the factory catch box, and from the factory box to the intake elbow, you should get enough venting under WOT so that you don't need the oil-fill connection to run to the MM can.

[Evansa22]

In regards to the power cut, I've had an issue on mine but it's a 2018. I'm not sure if they've changed the tune in the newer camaros, but when traction control kicks in on mine, it will completely shut off the injectors on one bank. It's an extreme on/off of power and sometimes it'll cycle a few times. My tuner has played with some tc settings to see if their's a way to turn this off, and default to throttle blade closure only. So far we haven't found a way around it, but sounds like this is possibly happening on yours. Like everyone else has said, log it, it will be pretty apparent if this is the case as injector pulse widths just go to 0.