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#Wandering Idle and Vacuum "blip"

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 Post subject: Wandering Idle and Vacuum "blip"
PostPosted: Wed Dec 10, 2014 9:00 pm 
First Gear
Joined: Thu Dec 26, 2013 4:22 pm
Posts: 222
Location: Minnesnowda
The idle was fine until recently when I blew the seals in my turbo. As expected, oil all over in the intake, TMIC, etc. I drained the intercooler, swapped a td04 in and seafoamed the IACV and pcv valve/intake. The car does run great when driving. Will drop RPM's almost to a stall when sitting every now and then but usually RPM's look like what is on the video (link below).

Also captured in the video, is a vacuum "blip" that I have noticed ever since I have hooked up the boost gauge. Just wondering if this is normal or if I should be investigating this. Anybody else have this happen? Must be the massive horsepower right? lol

https://www.youtube.com/watch?v=u-uOP2s ... e90ExFbS4A

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Rusty 1991 EJ22T - VF28 - '07 wrx TMIC - MBC - Invidia DP - Walbro 255


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 Post subject: Re: Wandering Idle and Vacuum "blip"
PostPosted: Wed Dec 10, 2014 11:08 pm 
Fourth Gear
Joined: Tue Jul 31, 2012 10:32 pm
Posts: 1220
Location: Portland, Oregon.
Looks normal to me, are you sure you didn't tap the throttle on the blip?

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 Post subject: Re: Wandering Idle and Vacuum "blip"
PostPosted: Thu Dec 11, 2014 2:06 am 
First Gear
Joined: Thu Dec 26, 2013 4:22 pm
Posts: 222
Location: Minnesnowda
For sure. Had both feet away from the pedals. That happens if I am idling or at cruising speeds on the freeway or anything in-between. My curiosity finally got me to raise a question. Took me a few tries to capture that on video. It blips so randomly.

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 Post subject: Re: Wandering Idle and Vacuum "blip"
PostPosted: Sun Dec 14, 2014 5:14 am 
Site Admin
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Joined: Tue Oct 15, 2002 11:37 am
Posts: 26948
Location: Houston, Tx
I have a theory....where did you tap into for your vacuum/boost gauge?

If you're tee'd into the line between the MAP sensor and pressure exchange solenoid it would exhibit the exact behavior in the video when the pressure exchange solenoid opens to let the MAP sensor check ambient pressure.

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Josh

surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
1997 Impreza OBS

If you need to get a hold of me please email me rather then pm


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 Post subject: Re: Wandering Idle and Vacuum "blip"
PostPosted: Sun Dec 14, 2014 6:04 am 
First Gear
Joined: Thu Dec 26, 2013 4:22 pm
Posts: 222
Location: Minnesnowda
That is exactly where it is drawing from. Thanks for answering that Josh!

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 Post subject: Re: Wandering Idle and Vacuum "blip"
PostPosted: Sun Dec 14, 2014 6:18 am 
Site Admin
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Joined: Tue Oct 15, 2002 11:37 am
Posts: 26948
Location: Houston, Tx
You're welcome.

You need to tee into the line between the intake manifold and pressure exchange solenoid. That should take care of the vacuum blip. I'm not sure if it will change your idle though. You may also want to reset your ECU.

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Josh

surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
1997 Impreza OBS

If you need to get a hold of me please email me rather then pm


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 Post subject: Re: Wandering Idle and Vacuum "blip"
PostPosted: Tue Dec 16, 2014 7:35 pm 
First Gear
Joined: Thu Dec 26, 2013 4:22 pm
Posts: 222
Location: Minnesnowda
I reset the ECU and will move the boost T soon. So far I still have a stumble in the rpm. At this point I am not going to worry about it though (Meaning it is too cold out again) lol

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