View Full Version : huge vacuum leak after jrsc install

10-22-2010, 07:43 PM
aight i just recently installed the jrsc on my ep3.. and it runs good pulls hard but when i let off gas from switching gears while driving normal the rpms hang there instead of dropping.. also at a stop light my car idles high about 2000 then comes down to 1200 bounces back up to 15 1600 for a secound then come down to idle normal.. i checked all lines and everything is good...

i did reuse the intake gasket could that be the problem????

10-22-2010, 07:46 PM
Could be the gasket, you could always spray any aerosol brake clean/parts clean/etc around the intake manifold gasket and see if that drops the idle. You sure its not a problem with the tune? If it were really bad you'd be able to hear it, the leak that is.

10-22-2010, 07:49 PM
the tune i would think would be alright i am using the powercard.. i know i need k-pro but i have talked to moss and im only running 5 lbs so i think the powercard would be good for 5 lbs..

Canuck Civic
10-22-2010, 09:07 PM
Sounds like a IACV problem.

10-22-2010, 10:09 PM
Did you check the supercharger bolts to head, mainly the bottom ones. Also check the bolts on the sc to manifold and tb bolts.^^ Iacv could also be a problem after you check the bolts clean it. Img is probably fine the tb gasket could have gone to crap, it's paper-ish.

10-23-2010, 10:35 PM
I bet you anything its the inferior bolt on the manifold that isn't secured all the way, hard to get too, I'd start there.

10-24-2010, 05:46 AM
With the idle is going up to 1500 or so and then dropping down to correct I highly doubt is a vacuum issue, a vacuum issue would continually cycle from 1000 to 2500 or so, it doesnt settle down.

With Kpro there is a simple adjustment for that, the idle duty cycle slider.

10-25-2010, 05:12 AM
Make sure to check your injectors at the manifold. I had a hard time getting the O-rings to seal into the JRSC manifold. I am leaning towards Talons explanation though. A vacuum leak would have a consistent up and down rev between standard idle and ~2500 RPM.

10-25-2010, 05:19 AM
did this start the first time you ran the engine after the install or did it creep up a little later?