Can a catch can cause surging, bucking?

flaudia402 · 01-08-2019, 07:49 PM

Have an ‘18 SS 1LE with less than 2700 miles. No mods other than a mishimoto catch can. Noticed in the mornings when it’s cold the car will surge and buck for the first couple minutes/driving a few miles. Concerned that the catch can is to blame?

sav03cobra · 01-08-2019, 08:08 PM

Mine does that too! Did it before and after mods. I dunno???

SSDan · 01-08-2019, 08:20 PM

Have you double checked for any vacuum leaks? I once left the valve on a CC partially open and it created some odd idle and low rpm issues.

Also, these LT1's can have some rough idle manners after a cold start in colder weather.

flaudia402 · 01-08-2019, 08:29 PM

Quote:

Originally Posted by SSDan

Have you double checked for any vacuum leaks? I once left the valve on a CC partially open and it created some odd idle and low rpm issues.

Also, these LT1's can have some rough idle manners after a cold start in colder weather.

I can’t think of any where on the catch can there could be a leak? I’m going to buy an OBD scanner on Amazon and check. Installation of the mishimoto catch can was painless. I can’t imagine it screwing anything up.

Mark114 · 01-08-2019, 09:20 PM

I suggest you disconnect the can and reinstall the original PCV hose to see if the car runs differently.

JCunningham · 01-08-2019, 11:41 PM

its cold. what rpm are you bucking at? does it go away after it warms up? if it goes away after it warms up its normal on a 455 hp car with a stick if your running at a low rpm. keep it around 2000rpm until it warms up under 4500.

AdmAnt13 · 01-09-2019, 06:58 AM

Mine does the same thing and I have no catch can. Always wondered if it was my CAI but glad to see others have the same issue.

714camaro · 05-24-2022, 11:43 PM

Jus finished installing a mms catch can on my 16 camaro ss with an lt4 blower. After initial start up the rpms would surge followed by a rough chop that would cause everything to shake. The rpms surge every 2-3 second until the motor stalled. I rechecked all my fittings and connections to make sure there was no vacuum leak or pinched hose. I'm bamboozled after a full day of trying to figure this out.
The mighty mouse can is set up coming from the port under the supercharger snout near the valley. Mighty mouse includes a piece called a diverter which replaces the factory plug and allows the pressure/oil to be vented to the can. From the can my return line tees off into the brake booster near the throttle body.

Crushin_LT1 · 05-25-2022, 09:33 AM

Quote:

Originally Posted by 714camaro

Jus finished installing a mms catch can on my 16 camaro ss with an lt4 blower. After initial start up the rpms would surge followed by a rough chop that would cause everything to shake. The rpms surge every 2-3 second until the motor stalled. I rechecked all my fittings and connections to make sure there was no vacuum leak or pinched hose. I'm bamboozled after a full day of trying to figure this out.
The mighty mouse can is set up coming from the port under the supercharger snout near the valley. Mighty mouse includes a piece called a diverter which replaces the factory plug and allows the pressure/oil to be vented to the can. From the can my return line tees off into the brake booster near the throttle body.

Might be a dumb question, but is there a difference between catch cans meant for the LT4 and the LT1? If so, did you purchase the correct one?

Readr1 · 05-25-2022, 10:46 AM

If your motor will stay running, you could try the old carb cleaner trick, spray short bursts around possible vacuum leak areas and if the motor stumbles you have a leak in that area.
Are there any engine codes popping up?

01-08-2019, 07:49 PM	#1
flaudia402 Drives: 2018 SS 1LE Join Date: Aug 2018 Location: LA Posts: 54	Can a catch can cause surging, bucking? Have an ‘18 SS 1LE with less than 2700 miles. No mods other than a mishimoto catch can. Noticed in the mornings when it’s cold the car will surge and buck for the first couple minutes/driving a few miles. Concerned that the catch can is to blame?

01-08-2019, 08:20 PM	#3
SSDan Drives: 2016 1SS 6MT NPP Join Date: Feb 2010 Location: Lake Murray, SC Posts: 2,261 View My Garage	Have you double checked for any vacuum leaks? I once left the valve on a CC partially open and it created some odd idle and low rpm issues. Also, these LT1's can have some rough idle manners after a cold start in colder weather. __________________ 2016 Camaro 1SS Hyper Blue 6MT NPP 2010 Camaro 2SS Cam/Headers/CAI/3.91 gears 476 rwhp/440 rwtq (sold)

01-08-2019, 11:41 PM	#6
JCunningham Drives: 2017 2SS M6 Join Date: Jun 2013 Location: WNY Posts: 7,069	its cold. what rpm are you bucking at? does it go away after it warms up? if it goes away after it warms up its normal on a 455 hp car with a stick if your running at a low rpm. keep it around 2000rpm until it warms up under 4500. __________________ real ZL1 wheels and brakes, 285/305 Michelin Pilot Super Sports, Pray ported Intake manifold, Soler Throttle Body, Rotofab intake, EFI Tuning Flex fuel kit, full American Racing Headers Exhaust, 1 7/8" w/ cats H pipe and mufflers. Full 1LE suspension, with BMR adjustable sway bars and links, GM aluminum cradle bushings, Hurst shifter with lighter reverse spring, TWM shifter knob, Tick level 1 transmission. I should have bought a ZL1

01-09-2019, 06:58 AM	#7
AdmAnt13 Drives: '16 Red Hot 2SS M6 NPP Join Date: Apr 2016 Location: The Beach, NC Posts: 603	Mine does the same thing and I have no catch can. Always wondered if it was my CAI but glad to see others have the same issue. __________________ '16 2SS, M6, Borla Atak

05-24-2022, 11:43 PM	#8
714camaro Drives: Chevy Camaro 2SS Join Date: Sep 2019 Location: California Posts: 87	Jus finished installing a mms catch can on my 16 camaro ss with an lt4 blower. After initial start up the rpms would surge followed by a rough chop that would cause everything to shake. The rpms surge every 2-3 second until the motor stalled. I rechecked all my fittings and connections to make sure there was no vacuum leak or pinched hose. I'm bamboozled after a full day of trying to figure this out. The mighty mouse can is set up coming from the port under the supercharger snout near the valley. Mighty mouse includes a piece called a diverter which replaces the factory plug and allows the pressure/oil to be vented to the can. From the can my return line tees off into the brake booster near the throttle body. __________________ '16 Camaro 2SS A8, LT4 Blower (2.30 griptec), Intake, LT4 Low-Side Fuel System, Catless

01-08-2019, 08:08 PM	#2
sav03cobra SS Copbait R.I. Drives: 2016 Camaro 2SS Join Date: Dec 2016 Location: Aquidneck island Posts: 217	Mine does that too! Did it before and after mods. I dunno???

01-08-2019, 09:20 PM	#5
Mark114 Drives: 2016 2SS Convertible Join Date: May 2012 Location: St. Louis, MO Posts: 1,759 View My Garage	I suggest you disconnect the can and reinstall the original PCV hose to see if the car runs differently.

05-25-2022, 10:46 AM	#10
Readr1 Drives: 2018 ZLE Join Date: Nov 2021 Location: DFW Posts: 32	If your motor will stay running, you could try the old carb cleaner trick, spray short bursts around possible vacuum leak areas and if the motor stumbles you have a leak in that area. Are there any engine codes popping up?

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