Expert please: Question on Oil Metering Pump
 

Hi Guys,
Should my Oil Nozzles hold a vacuum? Cause the two that I removed from the LIM don't hold a vacuum, while the other 2 on the block do.

OK now I understand how they work (vac is supplied by intake stroke @ engine side of nozzle and air flows from in front of throttle plates into the motor bringing with it a little oil)

But, my if my nozzles are allowing air to flow in the other direction, which 2 of them are, aren't they allowing some of the compression storke to escape?

The nozzles don't hold a vacuum. They have check valves in them, so you should only be able to blow through them one way (towards the engine).

FSM page 2-6.

I can suck very slowly through 2 of them...
Could this cause a noticeable power loss-by allowing compression stroke to escape.. or am I just being anal :)

In what direction? If you can blow in the outward direction (i.e. from the engine side to the vac line side) then you'll be losing some compression. Dunno how much (I guess any is too much) but I'd replace them anyway.

Yes I can suck a small amount from engine side to vac side.
I have a vacuum testor and they don't hold vacuum. I can pull air through in the wrong direction. I guess the check valves are done. I sprayed silicone in one and it held vac a few times then didn't.
There has to be some loss of compression I agree, you say replace, FSM says replace...I might have to replace these:)

Do you know where I can find 2 oil nozzles?

Good question, I think the dealer charges 50$ a piece for them. As crazy as that sounds, thats what I heard from someone on these boards. Im curious as to a part number as well.

they are located in the intake stroke side of the engine, you wouldn't be losing compression, if anything they would allow oil to be drawn in when it shouldn't be allowed to.

I loose boost, (I think) compressed air is allowed to escape from LIM to in front of throttle plates (but there's boost there too).
How much though? That's what I'd like to know. Equivalent to a good vacuum leak? Factory service manual lays out a test which I failed so I guess I must replace.

part # is N236-14-639B Check Valve (it's two parts, connector and check valve)

boost could be going back through the OMP, but i don't know that it is even possible. the hydraulics of the OMP should be able to hold back the boost pressure easily i would think.

no I don't think that could happen, it could however travel back toward where the other end of the air tube meets the throttle body. Bottom line is they fail the FSM test and are suppossed to be replaced. I hope I can find some cheap.

but you said the check valve failed?

Karack I edited my reply above, check valves have failed allowing air to travel out of LIM.

Thanks

The OMP injectors have an interesting failsafe..

This is what I think, yea, im not sure, but im pretty sure its right.

If the injector is bad, and air is allowed to blow back through (boost pressure) the injector, the oil will not go back into the OMP. There is not enoughe pressure to do that, no way. It would most likely go back up the air breather tube, back into the intake near the TB.
For the NA, this would never happen, as its always a vacuum in the intake. The breather tubes purpose is to allow filtered air in to help the oil flow out of the injector. Like when you tip a 2L pepsi upside down, it flows out, but not very well. If you punch a hole in the top, air can now help push the pepsi out.

At least thats what I think is all behind the oil injector..

/me sighs, its been covered with enough dead threads that there is no viable reason to create another...