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New Rough Idle

Old May 26, 2007 | 08:57 PM
  #1  
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St. Jude Donor '08-'09-'10-'11
Default New Rough Idle

After installing my oil catch can, im suddenly getting a rough idle the next morning. I ran it the night of the install and it was fine or atleast I didnt notice.

Now it jumps between 400 and 900 RPM and a fairly fast pace, but after driving it a mile or so the idle is nice and smooth at 600.

Could it be the catch can? or any other ideas?

I have the oil catch can lines running from behind the valve to to top connector of the can, then the lower connector (not the drain) running to where the old hose I took of came from.
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Old May 27, 2007 | 07:21 AM
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ttt
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Old May 27, 2007 | 10:21 AM
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Default Rough Idle

[QUOTE=B-rent;1560411273]After installing my oil catch can, im suddenly getting a rough idle the next morning. I ran it the night of the install and it was fine or atleast I didnt notice.

Now it jumps between 400 and 900 RPM and a fairly fast pace, but after driving it a mile or so the idle is nice and smooth at 600.

Could it be the catch can? or any other ideas?
QUOTE]

Any chance you dis-connected your battery for the catch can install? If so, the PCM is relearning several settings including correct idle...after you drive it several times it should come back to normal...but give it enough driving cycles for the PCM to reset all functions, before you resort to using the Idle Relearn procedure.
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Old May 27, 2007 | 10:34 AM
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The relearn idle procedure is very simple. If you have a 6 speed, basically you just need to have the car warmed up to at least 176F and put the car in neutral (with emergency brake) and turn off all accessories. Let it run for about 5 minutes and then shut off the car. Wait 30 seconds and turn it back on. Thats all you have to do.
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Old May 28, 2007 | 02:51 AM
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Originally Posted by corvettedoug
The relearn idle procedure is very simple. If you have a 6 speed, basically you just need to have the car warmed up to at least 176F and put the car in neutral (with emergency brake) and turn off all accessories. Let it run for about 5 minutes and then shut off the car. Wait 30 seconds and turn it back on. Thats all you have to do.
I have an auto, but no i didnt disconnect the battery. I did have to install it down by my blackwing because the S/C took up all the room near the intake manifold. Is it possible the longer hoses are doing it?

Tonight while it was idling and jumping it even actually died on me. The Service Engine Soon comes on after 20+ mins of highway driving but no codes.
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Old May 28, 2007 | 09:09 AM
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make sure all your connections are tight - thsat you have not created any vacuum leaks
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Old May 28, 2007 | 03:27 PM
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Originally Posted by 99 vett babycar
make sure all your connections are tight - thsat you have not created any vacuum leaks
Thats was I was thinking today. Im going to reinstall the stock hose and disconnect the catch can. If that takes care of it I know what to work on


Would this cause it to smoke lightly to medium on start ups too?
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Old May 28, 2007 | 04:28 PM
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I'm not an expert on this, but catch can should have nothing to do with this problem.... or smoking. BTW, what kinda catch can is it?
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Old May 28, 2007 | 08:11 PM
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Its one from CCA, Im not sure either, I just know thats the mod I did and it ran ok that night, but the next morning this started
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