ZL1 1LE wont make more than 3lbs of boost

HBM1LE · 10-16-2025, 03:22 PM

As the title says, my 2019 ZL1 1LE refuses to make more than 3lbs of boost, and it has no CEL. The car runs and drives great, minus being down heavily on power. I have checked the Boost Solenoid and associated parts, and they all seem to be working. Can't find any boost leaks, and nothing obvious sticks out as far as wiring/electrical goes; the belt and all pulleys are also solid. Curious if anyone here has experienced this or has any advice on further diagnosing the problem, thanks!

bishopts · 10-21-2025, 08:10 PM

Belt slip?

HBM1LE · 11-20-2025, 11:09 PM

Quote:

Originally Posted by bishopts

Belt slip?

Unfortunately, it is not haha.

AZIROC · 11-21-2025, 04:05 AM

Bleed your super charger. air bubble(s) may have formed in the system. also check for proper flow incase the pump is going bad.

*Joshinator99* · 11-21-2025, 08:17 AM

Quote:

Originally Posted by AZIROC

Bleed your super charger. air bubble(s) may have formed in the system. also check for proper flow incase the pump is going bad.

This

arpad_m · 11-21-2025, 08:21 AM

^^^ this

Several members had similar issues with their LT4 supercharger, and bleeding its cooling circuit fixed it. (Well, in addition to letting the air out, adding a reservoir like it's done with Magnuson and Whipple units is the true ultimate solution.)

AZIROC · 11-21-2025, 03:15 PM

I got this aftermarket reservoir prob 5 years ago after I had the same issue. Bought the car in Texas, drove it home to AZ and no issues few weeks later I took it out for a drive and I was like... it seems ALOT slower. I did the "affordable" bleeding *aka cut in 1/2 2liter and a hose* and some bubbles came out. Took it for a drive and it was "better" or so I thought.

I did full exhaust and a few other small mods but needed a tune thats when I found out the pump was going out, causing really high temps and causing the blower pretty much not give me full boost. So it got replaced and been running great for years.

I used this aftermarket reservoir. Its been out for a while and there may be more affordable options...but ill never have to worry about air bubbles again.

https://admperformance.com/products/...sivoir-upgrade

HBM1LE · 12-02-2025, 05:54 PM

Quote:

Originally Posted by AZIROC

I got this aftermarket reservoir prob 5 years ago after I had the same issue. Bought the car in Texas, drove it home to AZ and no issues few weeks later I took it out for a drive and I was like... it seems ALOT slower. I did the "affordable" bleeding *aka cut in 1/2 2liter and a hose* and some bubbles came out. Took it for a drive and it was "better" or so I thought.

I did full exhaust and a few other small mods but needed a tune thats when I found out the pump was going out, causing really high temps and causing the blower pretty much not give me full boost. So it got replaced and been running great for years.

I used this aftermarket reservoir. Its been out for a while and there may be more affordable options...but ill never have to worry about air bubbles again.

https://admperformance.com/products/...sivoir-upgrade

Installed this same reservoir in hopes of fixing this issue, and just because I wanted it, but it made no changes unfortunately.

AZIROC · 12-02-2025, 06:13 PM

Have you confirmed there is actual flow? The pump is a small pain to get to to see if its working properly

HBM1LE · 12-02-2025, 09:50 PM

Quote:

Originally Posted by AZIROC

Have you confirmed there is actual flow? The pump is a small pain to get to to see if its working properly

Well, when I installed the reservoir, it seemed to suck down the fluid faster than I could fill it so I would think so haha. What would be the best way to confirm?

AZIROC · 12-02-2025, 09:56 PM

Should be able to just see from the reservoir. As far as determining actual flow, that idk
.

AZIROC · 12-02-2025, 10:03 PM

I found this post mentioned the bypass valve may wanna give it a look at.

https://www.camaro6.com/forums/showthread.php?t=586912

HBM1LE · 12-02-2025, 10:11 PM

Gotcha, yeah when I jump the pump fuse I can hear it activate so i assume its working correctly. This issue has been quite the head-scratcher for sure. Took it to a shop, and they had it for over a month and couldn't figure it out. They originally thought it was the bypass control valve but nothing changed when they replaced it.

HBM1LE · 12-02-2025, 10:11 PM

Hmm, I will have to look at that

10-16-2025, 03:22 PM	#1
HBM1LE Drives: 2019 Camaro ZL1 1LE Join Date: Jul 2023 Location: Charlotte NC Posts: 13	ZL1 1LE wont make more than 3lbs of boost As the title says, my 2019 ZL1 1LE refuses to make more than 3lbs of boost, and it has no CEL. The car runs and drives great, minus being down heavily on power. I have checked the Boost Solenoid and associated parts, and they all seem to be working. Can't find any boost leaks, and nothing obvious sticks out as far as wiring/electrical goes; the belt and all pulleys are also solid. Curious if anyone here has experienced this or has any advice on further diagnosing the problem, thanks!

11-21-2025, 08:21 AM	#6
arpad_m Drives: 2018 Camaro 2SS A8 Join Date: Jul 2017 Location: East Tennessee Posts: 13,150 View My Garage	^^^ this Several members had similar issues with their LT4 supercharger, and bleeding its cooling circuit fixed it. (Well, in addition to letting the air out, adding a reservoir like it's done with Magnuson and Whipple units is the true ultimate solution.) __________________ 2018 Camaro 2SS — G7E MX0 NPP F55 IO6 735 rwhp \| 665 rwtq Magnuson TVS 2300 80mm pulley \| Kooks 1 7/8" LT headers \| JRE smooth idle terminator cam \| LT4 FS & injectors \| TSP forged pistons & rods JMS PowerMAX \| DSX flex fuel kit \| Roto-Fab CAI \| Soler 95mm LT5 TB \| 1LE wheels \| 1LE brakes \| BMR rear cradle lockout \| JRE custom tune 1100 - 1/30/18 \| 2000 - 1/31/18 3000 - 2/06/18 TPW 2/26/18 3400 - 2/19/18 \| 3800 - 2/26/18 4300 - 2/27/18 \| 4B00 - 3/01/18 4200 - 3/05/18 \| 4800 - 3/14/18 5000 - 3/16/18 \| 6000 - 3/19/18

10-21-2025, 08:10 PM	#2
bishopts Drives: 2017 2ss 6mt Join Date: Mar 2024 Location: dallas Posts: 948	Belt slip?

11-21-2025, 04:05 AM	#4
AZIROC Drives: '86 IROC-Z '18 ZL1 Join Date: Jul 2019 Location: Arizona Posts: 862	Bleed your super charger. air bubble(s) may have formed in the system. also check for proper flow incase the pump is going bad.

11-21-2025, 03:15 PM	#7
AZIROC Drives: '86 IROC-Z '18 ZL1 Join Date: Jul 2019 Location: Arizona Posts: 862	I got this aftermarket reservoir prob 5 years ago after I had the same issue. Bought the car in Texas, drove it home to AZ and no issues few weeks later I took it out for a drive and I was like... it seems ALOT slower. I did the "affordable" bleeding aka cut in 1/2 2liter and a hose and some bubbles came out. Took it for a drive and it was "better" or so I thought. I did full exhaust and a few other small mods but needed a tune thats when I found out the pump was going out, causing really high temps and causing the blower pretty much not give me full boost. So it got replaced and been running great for years. I used this aftermarket reservoir. Its been out for a while and there may be more affordable options...but ill never have to worry about air bubbles again. https://admperformance.com/products/...sivoir-upgrade

12-02-2025, 06:13 PM	#9
AZIROC Drives: '86 IROC-Z '18 ZL1 Join Date: Jul 2019 Location: Arizona Posts: 862	Have you confirmed there is actual flow? The pump is a small pain to get to to see if its working properly

12-02-2025, 09:56 PM	#11
AZIROC Drives: '86 IROC-Z '18 ZL1 Join Date: Jul 2019 Location: Arizona Posts: 862	Should be able to just see from the reservoir. As far as determining actual flow, that idk .

12-02-2025, 10:03 PM	#12
AZIROC Drives: '86 IROC-Z '18 ZL1 Join Date: Jul 2019 Location: Arizona Posts: 862	I found this post mentioned the bypass valve may wanna give it a look at. https://www.camaro6.com/forums/showthread.php?t=586912

12-02-2025, 10:11 PM	#13
HBM1LE Drives: 2019 Camaro ZL1 1LE Join Date: Jul 2023 Location: Charlotte NC Posts: 13	Gotcha, yeah when I jump the pump fuse I can hear it activate so i assume its working correctly. This issue has been quite the head-scratcher for sure. Took it to a shop, and they had it for over a month and couldn't figure it out. They originally thought it was the bypass control valve but nothing changed when they replaced it.

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