Hi guys,

I was testing my turbo components for failures and I came across the CRV testing. An image of the part is given below for reference.

I have read the testing procedure from the FSM page F-88 and the the thread from this forum which explains how to test the solenoids and the valves.
I was using a Mityvac vacuum/pressure pump to test the components.

1) As the per the FSM and the guide they say that when vacuum is applied to port A, we must hear the valve open and when the vacuum is released we must hear it close.
When I tried this I am hearing a very weak click sound during the application of vacuum and during the release.

2) Then the FSM and the guide say to connect the pump to port C and apply pressure up to 15 PSI and check whether it holds it. (Note the fact that pressure or vacuum is not applied to port A)
When i tried this port see was not able to hold beyond 5 PSI. When I tried to pump more it was leaking from port B.

3) I tried something else which the FSM or the guide said
I applied pressure on port A and port C.Then port C was holding pressure around 12 PSI.

I thought that my CRV has failed. Since the functionality of the standard BOV is same i tested that too. The results were exactly same.
I then borrowed 2 more used (25k kms) sets of CRVs/BOVs from my friends and did the same tests and the results were exactly same for all 6 valves..

I wanna know whether I am doing something wrong?
Whether these CRVs are good to use?
should I be spending 150$ to buy a new OEM CRV?
Are there any other alternatives for this (I am not going single turbo) ?

Thanks a lot for any kind of advise on this.

 

In my experience if you can pull a vacuum on port A and it holds and doesn't leak down, the valve is fine. They are pretty hardy and rarely fail.

Are you having some sort of boost issue that you're trying to track down?

Dale

 

Thanks a lot for your quick reply Dale.

Yes port A is not leaking at all. I applied vacuum upto 10 inHg and it holds.

To answer your question:

Yes I am having a car with a 97+ JDM engine (has a solenoid box instead of rats nest) which has done about 45k+ kms. The previous owner had no idea about these engines and has done no maintenance on these vacuum stuff.
After I got the car i felt like the engine wasnt pulling enough / no feeling of turbo kicking in.
But I felt the primary turbo and when i let go of the gas pedal i hear the blow off as well (have an HKS BOV in the IC pipe)
I dont feel any transition at 4500 rpm. Hence i started trouble shooting the vacuum lines.
I came across these findings

1) vacuum chamber had a loose hose
2) the check valve (green & black) which connects to the pressure chamber was broken completely and was in 2 pieces.
3) the check valve below the UIM (green & white) was leaking and not holding any pressure at all.
4) even after fixing an HKS BOV on the IC piping the stock BOV was present in the stock location and it was not holding more than 5 PSI pressure. Hence I believe that it was leaking boost all the time.
5) as i mentioned earlier the CRV was not holding pressure more than 5 PSI on port C when port A is free.

Please advise me on what needs to be checked and what needs to be done.
Thanks in advance...!!!

 

If you have the HKS BOV, the stock BOV that's toward the front of the Y-pipe needs to be removed, the hole capped off, and the vacuum line for it (coming from the upper intake manifold) needs to be capped or routed to the HKS BOV.

The CRV on the back side of the Y-pipe needs the vacuum line going to the correct nipple that goes to the solenoid valve that controls it.

Have you got a boost gauge to see what your boost pattern is?

The CRV should vent boost before the transition then should shut. If it is venting it could be something with the solenoid that controls it or it could be hooked to the wrong vacuum port for the vacuum hose.

Dale