Hi,
I'm about to install an open loop catch can (similar to the project imports kit) with an air filter venting to atmosphere, however I've run into a slight problem regarding the Idle Air Relearn procedure.

The procedure will only work if the coolant is a certain temperature and all these other conditions are met. Essentially, I'd have to run the car for a good 10 minutes at least to get to the normal operating temperature.

That being said to install my catch can i'd have to modify some hoses, cap a port or two, remove my PCV etc. Once the cans installed I won't be able to run without a PCV value, as the crank case pressure will be different. The car will barely even idle... (I tried disconnecting the PCV and starting the car... it stalls almost immediately)

Anyone have any suggestions?

My only idea was to have the can installed with the plumbing ready, but have my stock PCV system In place, then run the car to warm it up then quickly, swap over my hoses for the catch can and preform the relearn...
However this seems very inconvenient and might not even work.
Help!

I'd value your input

Thanks,
Mike

 

It should run with the PCVs open if you've properly capped off the spot on the intake the rear drivers side one went to and the spot on the manifold the passenger side went to.

I'm running open breather filters on mine and didn't have any issues with it running or have to do any idle relearn.

 

I'm going to go out on a limb and guess you've got the can hooked up wrong. This is causing you to pull air in through the breather, to the plenum, thereby bypassing the MAF. First... Don't run a vented can on a normally aspirated car. There is ZERO need for it. You should have a closed can. A catch can requires vacuum to operate correctly. Once you get a sealed can with two in's and one out, hook the two in's to the PCV valve location on the pass side and the vent on the driver's side. Then, hook the out to the plenum. Lastly, cap the port on the intake tube.