d4atls

Acura Parts @ AcuraOEMparts.com - Genuine Acura OEM Parts from Delray Acura

Above is a link to the part i'm talking about, the Bypass Valve Actuator is making a buzz sound for about one second when my ignition key is swithched from off to run. I'm sure it does it when cranking the car as well I just don't hear it because of engine noise. I know it's what's making the sound because when I unplug the connector to it and turn the key it doesn't make the sound. Any ideas? I have a wrecked 02 CL-S that I can pull a replacement from. But any ideas on what is happening here?

d4atls

No. 1 in the picture is whats making the noise, I know this open a flap in the middle of the intake manifold but this is one of the areas i'm a little lost about, can someone explain the purpose of this bypass valve?

Skirmich

That's the IMRC motor FYI.
And how do you even noticed that from the cabin? or you were working on the car and somebody else started the car?

If you have a replacement then install it, But as they say: If isn't broken, don't fix it.

d4atls

Anyone?

Skirmich

2-Stage Manifold works by creating 2 different pressures, One in Low RPM and One in High RPM.

When the Valve is Shut there is a different pressure build up between the 2 head banks thus Creating more Torque.
When the Valve opens at WOT there isn't any difference in pressure allowing the maximum airflow to enter the engine.

The purpose of that motor is to control the valve and its 2 different positions, Closed & Open.


Your Welcome.

d4atls

OK thanks for the tutorial have seen it a hundred times and it's one of the few things I never asked about. And actually I was turning the switch to the run position to run a computerized scanner I have to troubleshoot an SRS light, ended up being drivers seat belt buckle. Replaced it with the one from the CL which is slightly smaller and kindof a PITA to get it to click but it worked. Hang on i'm uploading a short vid where you can hear the sound it's making. I hope it's not broken but with that kinda sound it cant be good. And I was just going off what Honda calls the part which is Bypass Valve Actuator part #:17151-PFW-J02. Hang on i'll throw it on youtube and post a link.

d4atls

Ok, it's uploading to my Onedrive acct as we speak, How would I even know if there was a problem with this thing? Would it throw a CEL? Decreased performance? Doesn't look too hard to swap but id rather put one on that isn't making a weird crunching sound as the key passes the run position and not have to worry about things getting worse.....

Skirmich

You probably wont notice a decrease in performance it as it doesn't function until you WOT. It stays closed 24/7 = Low RPM... Its main job is to create torque at low rpm after all.

And iirc there isn't any OBDII codes for the IMRC as the 2-Stage Function is primary Passive Working.

d4atls

https://onedrive.live.com/redir?resi...t=folder%2cmp4

d4atls

lemme know that the link works.... It's me turning the key to the run position over and over. That crunch, buzz whatever is so loud you can hear it inside the car with the doors closed right before engine starts every time.

Skirmich

Yeah the link works.. Funny it looks like its trying to open the IMRC but perhaps the gears are broken? Have you tried with your second IMRC Motor?

d4atls

Not yet, working on removing it from the junk car now.....

d4atls

No more crunching, now to dissect the one I pulled off to see what the cause is

fsttyms1

If you listen closely at 4k you will be able to hear when it activates with the tone from the intake while wot.

d4atls

The only thing I ever hear is induction noise from the CAI at about 5200 rpm when the vtec solenoid kicks over. Sounds GREAT!

Skirmich

I will pay more attention to it now.