I just went to the dealership and got an oraphas/restricter pill, what ever you wanna call it. The thing that restricts air flow to the pressure sensor. Question is, what direction does it go in there? The two ends on it are different and i just wanted to make sure i got it in there the right way. Thanks...

 

pointing towards the manifold

 

so the small opening goes torwards the manifold?

 

It seems as though the pointed side (the side with the small hole) is tapered for a good reason. Installation.

There isn't too much science that goes into the design of the restrictor pill. I don't see a problem using it either direction, but do it the way it came, just to be sure.

The small hole towards the manifold, big hole to the sensor.

 

Could you post the price and part number please. I want to order one.

 

wtf is it?

 

its a peice of plastic that has a pin hole in it that goes in the vac line going to the pressure sensor in the engine bay

 

sorry to sound dumb, but what function does it perform, and what does it harm to remove it?

- chris

 

The orifice keeps the boost/pressure sensor from spiking. Smooths things out.

 

a little more info please. i have boost spike.

 

Prevents boost sensor voltage spikes/surges. It has nothing to do with actual boost pressure spiking.

 

"Prevents boost sensor voltage spikes/surges"
IM SORRY but can you explain the symptons of this?? im a noob

 

after all this time i didnt know we had those stock.... i always heard the fds talking about them for some reason

 

The signal that the line gets fluctuates rapidly.

If you had an accurate vac/boost gauge plugged into the line, and the gauge didnt have it's own pill, you could see the needle vibrate from the pulses.

Then, when you put the pill in, it restricts the flow and smooths it out, and the needle would now sit, or sweep, smoothly across the gauge. This works the same for the MAP sensor (what you guys call the boost sensor)

You can get a replacement very simply by going to an aquarium store and buying a restricter T (same ones used to restrict air that goes to the air stones in fishtanks) and then setting it to a little past halfway (or until the needle on your aftermarket vac gauge stops bouncing. Thats what I did for my MegaSquirt's MAP sensor and my vac gauge.

 

so it basically mellows it out for the ecu??

 

Basically, yes :p

 

I changed the vacuum line to the pressure sensor on a non turbo and went for a ride. It was a bucking bronco. I put the old line back on with the orifice and it did not buck. I found the orifice in the old line and put it in the new. All was well.

Others run without one and have no problems according to them. The car came with one and it's cheap at the Mazda dealer.

 

Part # 8931-13-986, it cost $3.63

 

Anything that will fit tightly in the vac line and has a 0.5mm hole drilled in it will work exactly the same, and will save you a trip to Mazda and the price of a beer.

 

nother noob question
is the n/a and turbo vac lines have the same size orifice for the boost sensor?

 

yes

 

I'm bringing this thread back from the dead because THIS ^^^^^^ REPLY is what clued me in to what my problem might be. I have a 1987 S4 Turbo with LOW impedance injectors and essentially all stock (also only 70K miles) and I recently redid all the vacuum lines and fuel lines on the UIM, along with gaskets. After assembling it all I had weird hesitations similar but not exactly like fuel cut at higher RPM, past the typical 3800 RPM switch over. Perhaps stumbling may be more descriptive?

I searched for a few solid months trying to diagnose the issue, pinned out the TPS, checked injectors, injector resistance box, checked the idle, changed plugs, tried to find any vacuum leaks and nothing was making a difference. I just happened to blow through the old pressure sensor vacuum line and it was very restrictive, light bulb moment! I shined a light down the line and there was a restrictor pill, orifice, whatever you want to call it. So I cut the old one open and put the orifice in the new line. The car now drives smoothly!! No hesitation, no bucking, and also less popping and backfires.

THANK YOU HAILERS!! If I ever meet you I owe you a pack of beer and a big hug for being in almost every search result and being so knowledgeable!!!

 

Yeah @HAILERS is the man. I'm pretty sure he isn't with us anymore considering he hasn't logged on in 11 years. RIP HAILERS.

 

I seem to remember he got locked out of it. He is using @HAILERS2 that's at least from 2012, regardless, alive or no he's a legend!