My initial thoughts are no but I'm hoping that I'm wrong.

 

The Non-Turbo ones are interchangable between series, so I suspect that the Turbo ones would be as well since they use the same gaskets.

 

http://www.mazdatrix.com/c-5.htm

Different numbers at that site. But I don't KNOW that they are/are not interchangeable.

 

Icemark & Hailers - the non-turbo ones also have different part #'s on the mazdatrix site therefore I would assume that the turbo models would also be interchangeable.

I don't have an FSM so could you tell me if there could be some line routing issues?

I want to get the S5 for my S4 since it is from a reliable source and free.

 

Well, if they use the same gaskets, then give it a try. I attach first a jpg of the acv out of the 89manual then a jpg out of the 87manual, both online. That's where I got the 89 one anyway. They look the same to me. I was worried about the tube that feeds it air from the airpump, but both look the same. They both have two solenoids and have three vac/pressure lines for activation and one vac line for the pressure sensor. It should work. What's with your old one?

 

Here's the 87flipped 180

 

ID really doubt if the acv is interchangable between the series due to the ACV having to route air from the airpump in the S5 to the 5th and 6th port actuators

 

I am gonna give it a go, I failed an e-test yesterday. The car is a completely stock 87 TII with the exception of a downpipe, aftermarket hi-flow cat, and racing beat cat-back. The cat is less than 1k old, all vacuum lines were changed in the last month and there are no issues other than a slight hesitation at full throttle in high rpm's.

My readings were high in HC's and CO at cruise and HC's failed at idle. I've read through the most of the posts regarding smog and have concluded that I probably have a malfunctioning ACV since I have no other symptoms of running rich.

I will perform some of the ACV tests that you have laid out in other threads as soon as the Toronto weather begins to co-operate. But I only have next week to figure it out so I am inclined to pickup an ACV asap as an educated guess. I refuse to pass smog the cheater ways since I want the car to run properly and protect my investment in the hi-flow cat.

Back to the question at hand re: issue of 5th/6th port opening on S5's. I think the ACV doesn't change but the direction the air takes changes after leaving the ACV, so it should hopefully work. Tell me if I am making sense.

 

The only difference between non turbo ones is that the 89-91 has a small vac line sized "T" off of the intake from tha air pump.

a Non Turbo S5 ACV however (as I said) can be used perfectly fine on a non turbo S4, if you cap off that T, or a S4 non turbo ACV used on a S5 non turbo, if you tap off of the line between the air pump and the ACV.

granted I know you are working with a Turbo, but because the same gasket is used throughout, I would again guess that the Turbo differences would again be about the same as the non turbo.

 

The diaphrams in the turbo ACV seem to bake and become useless after all these years. I'd get the new one and before installing it, put a piece of vacuum hose on the very bottom nipple and suck on it. You should be able to sustain a vacuum and see the poppet valve inside move when you do that.

Then put suction on the upper nipple. It should hold a vacuum.

The other two don't hold a vacuum. The more or less middle one routes airpump air over to the other side of the engine to the relief solenoid and the other nipple just feeds the pressure/boost sensor .

The acv your about to get might be off a JSPEC engine and might look different. If it is off a JSPEC engine it WILL be different. It should work though...with some modification. If I remember right it would be missing one of the two solenoids. The Port Air Solenoid. Not to worry. Thats disabled after twenty thousnad miles on a USA version anyway. But I THINK the JSPEC also has a different routing for the large tube/hose at the bottom of the acv. That can be over come easily.

And by now Hornbrn knows we're talking turbo acv, not non turbo acv.

 

Icemark & Hailers thanks alot, I'll try it out and get back to you guys.

Happy Holidays

 

Just correcting a mis-statement I made. The bottom nipple.....it gets pressure to operate it, not vacuum. So you blow into it to make the internal diaphram move. Then again, it still should be able to hold a vacuum. In other words the diaphram should not leak.

The upper nipple that sticks straight up gets vacuum and should be able to hold a vaccuum. Just correcting my mistake. Nothing else.

 

Hailers, Icemark & Silverotor

Well you guys hooked me up and I passed my e-test today.

Silverotor thanks for the ACV for free.

Hailers and Icemark thanks for the diagnostic help.

FYI the S5 ACV was of a JDM and had neither a port-air nor split air solenoid. I bought new plugs, wires, oil and oil filter to change them if I needed to but I was going to wait and see what difference the ACV made first.

Below are the readings with the old ACV.

Cruise Idle
HC 362 CO 2.27 NO 38 HC 585 CO 1.42 NO N/A

After new ACV

Cruise Idle
HC 45 CO 0.01 NO 1124 HC 194 CO 0.00 NO N/A

Well I can forget about e-test with this car forever since it will be exempt before the next roll call.

Thanks again

 

Excellent! I'm glad that you narrowed It down to the ACV being the culprit and achieving exceptional results. Thats the cleanest ACV you have that I'll ever see again.