speed_monkey

Ok I have a 86 n/a. Ok when i bought it he said that this part was sticking causing it to smoke on startup and unable to pass emissions. So here is my horrible attempt to describe the location....

Go to the left side (left when you are standing infront of the car) of the engine bay. Now look at the throttle body, then look down. There is a part that has a flat top shaped like a circle. Lmao see it told you its a bad description. I dont have a camera to take a picture.

If someone could take a picture i could point it out.

Thanks

Project84

Probably the oil metering pump, or OMP, or as Mazda named it, the Metering Oil Pump, or OMP. Either way, it injects engine oil through the rotor housing into the air/fuel mixture so it can lubricate the metal apex seals (similar to piston rings in a piston engine) on the rotor. Its attached to the throttle and the more you push the throttle, the more it injects. If its stuck open, its injecting way too much oil for idle and could very well be the cause of your problem. I removed mine so I can't take a picture, but if you download the free factory service manual (if you don't already have it) it should be in there.

Hope that helps some.

speed_monkey

Ok look to the left of the hand, it looks like that.

seven1997

iTrader: (2)

Looks like the pressure regulator for the secondary fuel rail!

speed_monkey

OOO so where can i get a new one? Is it bad that it ran some in that condition?

WAYNE88N/A

The double throttle diaphragm? That ain't gonna do it...That's to the upper left...

The other left- is that part of the ACV? Ain't on my car (of course, not much is these days)

I was thinking ACV before the pic came along... I think 7 got it...

MIDNFauciUSN

iTrader: (8)

i think thats the fuel pressure regulator...

speed_monkey

Ok, i am looking for one to replace it but no luck so far...

WAYNE88N/A

Never heard of those "sticking" before...

If it sticks closed, you'd have outrageously high fuel pressures and probably flood her on every start attempt...

If it sticks open, it would cause very low pressures, basically almost all of the fuel would be returned to the tank...

Mazdatrix has new OEM ones...

speed_monkey

I might just be blind but i didn't see it on mazdatrix

It starts and runs, today it was backfiring after i gave it gas

WAYNE88N/A

'Trix has 'em, that's where I got mine about 6 months ago when I thought I had a bad one. Pretty penny, IIRC...

Do you still have the ACV on the car? (air control valve)

What's your exhaust setup?

Backfiring can also be caused by a misadjusted mechanical idle, misadjusted TPS (throttle position sensor), or a bad ACV, among other things...

HAILERS

aw, this is just too silly for words. A fpr does not have a flat top. top meaning upper/highest point/pointing straight up. The fpr does not have that.

how large a diamenter is this *flat top*? does this item have any electrical wires going to it? does this item have any vacuum hose going to it? does this item have just one vacuum hose going to it? does this item have a large black hose coming out the bottom of it and a large black hose going into the front side of it? is this item bolted in a pipe with two 10mmsize bolts holding it on?

mainly measure the diameter of the flat top and write back.

p.s. your engine probably smokes because the oil control rings are all used up and it will cost about 1100 bucks to fix the problem, and that's with a half *** rebuild

speed_monkey

Ok, if you look at the throttle body then look directly down its right there. It is attached to something else that has 2 wires, 2 big hoses and 2 little hoses running to it.

HAILERS

It's the air control valve if it looks like this jpg. Write back if it does.

speed_monkey

yeah i think that is it

$375 man for that much i hope that is it lol

Is there any way i can replace just the top round thing or do i have to buy the whole acv?

HAILERS

That is the ACV or air control valve. It ports airpump air mainly to the exaust ports AT the exaust ports and sometimes it sends air pump air to the split air pipe that sends air pump air to the catalytic converter. Its other duty is upon deceleration to send a small amount or air to the intake to prevent afterburn i.e. backfire. It also has a Port Air Solenoid towards the front of it that sends air to the exaust ports untill twenty thousand miles has been reached then it is disfunctional for the rest of its life (there is an exception but you don't need to know that). It also has a Split Air solenoid towards the rear that feeds air to the split air pipe when in fifth gear. Energized in fifth gear only to the best of my knowledge.

None of the above features will cause the car/engine to smoke. I won't mention what I think about the fellow who told you that. I wrote that but had to erase it due to the screws who monitor this site.

speed_monkey

So do i need to replace it? Or can i just leave it like it is and get mad backfires?

So basically i just need to rebuild my engine? damn oil seals lol. Looks like i have to find a shady place and bribe them for my emmisions

HAILERS

You won't get wild backfires. I have one that leaks air from the anti afterburn part of the ACV. I blocked off the port that leaks air to the intake manifold and notice NO backfires at all. It's really the other two major functions of the acv that need to be addressed.

On a n/a engine, there are two vacuum hose just above the acv. The way to see if the major functions of the acv are operable, is to get a piece of vacuum hose approx a foot long. With the engine off, put the new vacuum hose on one of the two nipples just above the acv. Suck on the hose and see if it will hold a vacuum. There is a diaphram inside of the acv that should hold a vacuum. Then go to the other nipple above the acv and do the same thing to it. Both should hold a vacuum. If they do ....the acv is functional. If not, then you need a good used one. Not easy to find since most folk don't know a good one from a bad one.

Actually the two solenoids on the acv can be kaput and not effect emissions testing in the least.

Your smoke problem could possibly be another thing than oil control rings. It is possible that one of the oil injectors is feeding oil at a massive rate at idle. Not likely but possible. Check and see if the metering oil pumps rod is connected to the throttle linkage.

I tied my oil metering pumps rod to the full open position once and found that you will get oil smoke at extended idling periods. Just sucks that oil right out of the pan into the combustion chamber.

Three bills is too much for a acv imho. But you can't buy a new one cheaper. Maybe a used one. A good used one.

speed_monkey

What do you mean hold a vacuum?

HAILERS

Say you have a piece of vacuum hose. If you put your finger over one end and then sucked on the other end and quickly put your tongue over the opening, you'd feel a vacuum pulling on your tongue. If it were leaking and you sucked on the vacuum hose when connected to the nipple as I described above, you would not feel that vacuum or suction on your tongue.

Or if you had a straw and put your finger over one end and sucked on the other end and put your tongue over the end quickly you'd feel a suction effecto on your tongue. Right? Right. If the diaphram is busted in the acv then you won't be able to pull/hold a vacuum when you suck on the hose. Something like that.

WAYNE88N/A

I'm going to figure out this 5th gear thing for you, Hailers. Just read the split-air sol valve's output at the ECU while I'm driving. Even though the actual components are no longer functional, the ECU's signal should still be. I'll get back with ya with the results. BTW, I see you like to suck on things...

HAILERS

[QUOTE=WAYNE88N/A]I'm going to figure out this 5th gear thing for you, Hailers. Just read the split-air sol valve's output at the ECU while I'm driving. Even though the actual components are no longer functional, the ECU's signal should still be. I'll get back with ya with the results. BTW, I see you like to suck on things...[/QUOTE ]

Are you nuts or what? You put the car in fifth gear and in turn put a ground on the Split Air Solenoid. What's so difficult for you?????? Shall I post a jpg of the EGI EMISSIONS CONTROL SYSTEM SECTION Bb-2 for you????????????

Same thing for a non turbo except its indirect and not a direct ground to the Split Air Solenoid. Fifth puts a ground to the ECU and the ECU in turn puts a ground on the Split Air Solenoid

You don't have to drive the car. Just put the dang thing in fifth gear in the driveway and listen to the poppent in the Split Air Solenoid pull in. OR READ THE FSM. Fuel Seciton.

Did you get out of the service on a Section Eight?