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Old 01-14-2019, 02:15 PM   #1
02fbody35th
 
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Need some help

I was wondering if one of you fellas would verify that a concern of mine is normal. I noticed when pulling the oil fill cap while the engine was running there was a pretty strong suction of vacuum on it. And the engine started idling funny. I noticed this after I installed a catch can. Can one of you pull off your oil caps while the engine is running and report back. Just wondering if the stock motor does the same thing. My OCD would very much appreciate it. Thanks
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Old 01-14-2019, 02:47 PM   #2
avalonandl

 
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Did you remove the PCV?
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Old 01-14-2019, 03:51 PM   #3
02fbody35th
 
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Quote:
Originally Posted by avalonandl View Post
Did you remove the PCV?
I believe the PCV is integrated into the valley plate. There is a port in the plate that elite has you swap out with thereís. I did that. Does your motor have a vacuum on the oil cap?
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Old 01-14-2019, 03:53 PM   #4
Johnjan
 
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Why would you remove the oil cap while the engine is running?
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Old 01-14-2019, 03:56 PM   #5
02fbody35th
 
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Quote:
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Why would you remove the oil cap while the engine is running?
It was off when I started the car. Thatís when I noticed the vacuum. It doesnít hurt anything to remove the cap while itís running. Iím just wondering if itís Normal?
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Old 01-14-2019, 08:12 PM   #6
OVERPAR73
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Elite Catch Can

You diffenatly don't want to remove the lower catch can cup while the engine is running or start the car without it installed. Your basically creating a large vacuum leak with it removed. Your engine will run really rough for a whale until the computer takes over and tries to compensate for the leak, you might even throw an error code. All that suction just shows your catch can is working correctly and doing exactly what it's supposed to do. I have a catch can on my 2013 ZL1 as well and it usually has just a small amount of oil when I check it. So glad all that oil isn't going back into the supercharger. Still trying to mount the Elite catch can on my 2018 ZL1 with the correct brackets at the front of the engine area like yours.
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Old 01-14-2019, 08:17 PM   #7
02fbody35th
 
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Originally Posted by OVERPAR73 View Post
You diffenatly don't want to remove the lower catch can cup while the engine is running or start the car without it installed. Your basically creating a large vacuum leak with it removed. Your engine will run really rough for a whale until the computer takes over and tries to compensate for the leak, you might even throw an error code. All that suction just shows your catch can is working correctly and doing exactly what it's supposed to do. I have a catch can on my 2013 ZL1 as well and it usually has just a small amount of oil when I check it. So glad all that oil isn't going back into the supercharger. Still trying to mount the Elite catch can on my 2018 ZL1 with the correct brackets at the front of the engine area like yours.
Itís seems that you a correct, and the can is doing what itís designed to do. I was just kind of surprised by the amount of vacuum in the crank case. Pretty cool!
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