Does anybody know for sure, the routing of the air from the ACV to the exaust ports on a 87 TURBOII?

Such as: the air leaving the acv, entering the intake manifold passage, exiting the intake manifold passage thru that rectangular hole below the two intake passages for the intermediate housing, then traveling down an internal passage inside the intermediate housing and ?????? exiting a hole at each exaust port (similar to the n/a?)?????

 

i know it comes out into the port like an na, but off the top i'm not sure how it gets there, dont the fc's go thru the front and rear side housings?

mike

 

Oversteer has a emission problem with his 87turboii.

I know how a 87n/a routes its acv air. Its like you said, through the end houlsings, then thru the rotor housings to exit at the small holes IN the exaust ports.

I never paid any attention to the turbos routing. Looking at the intake and exaust gaskets at Mazdatrix.com, I can see that it must exit the intake manifold just below the intake holes in the intermmediate housing. I see no holes at the end of the intake gasket for it to have exited there. So it must enter the intermediate housing thruough a rectangular hole, go down a passage in the intermmediate housing and then exit into the exaust ports as you said. Just travels a different path than the n/a to get there.

Oversteers car reacts different than others. A person can look at his o2 sensors output at idle, then disable the airpump or the acv, which ever, and the o2 reading should go up and read .6 to .8. Because now there is no air being mixed in the exaust prior to the o2 sensor.

Works that way on all three of my cars and also Rob500's car. Oversteer has emissions problems,and it seems there is no air being mixed into the exaust ports from the acv/airpump. We're trying to find out why. He has already found the swithcing diaphram is bad in the acv and has fixed that with another diaphram. Still no air being mixed in the exaust ports though.

 

Does he have to pass visual?
What are his current mods looking like?

For my It was easier just to leave my ACV block off plate on, and put back on the airpump and ran a line straight from the airpump to the lower portion of the split air pipe. I passed with flying colors.

 

the fd's have front and rear rotor housings, with you guessed it the only difference being the air injection ports, so if you mix up housings front and rear you cannot get the air to the ports. the best way to figure this out is the see if you can blow into that passage

mike

 

Yeah. We already discussed the front/rear rotor housings, and he says his engine is not a rebuild. I assumed that meant it was a stock engine. He also knows how to ID the front and rear housings by looking at the F and the R on each housing.

He's going to stick a rag into the exaust port of the acv to build back pressure and then see if his o2 reading changes from the .8v or so that it shows now.

He's using a volt meter on his o2. That's one problem he fixed already. His 02 was grounded to the shield and it read zip. But once he ungrounded his o2 it read good. Just does not drop in voltage as a normal car will at idle.

He said his emissions test is evidently on a dyno, not just a sittin there.

Actually he has a bigger problem in a sense. He says he reads 12volts at pin 2B on his 87turbo. That's the output of the boost/pressure sensor. That ain't good. Weird.

 

i wonder about the condition of his harness?

mike