Question on Oil Metering Pump & Vacuum
#1
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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?
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?
Last edited by kick7ca; 01-01-05 at 05:34 PM.
#3
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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 ****
Could this cause a noticeable power loss-by allowing compression stroke to escape.. or am I just being ****
#4
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Originally Posted by kick7ca
I can suck very slowly through 2 of them...
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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?
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?
Last edited by kick7ca; 01-01-05 at 07:08 PM.
#6
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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.
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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)
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)
Last edited by kick7ca; 01-01-05 at 07:53 PM.
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Originally Posted by Karack
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.
Last edited by kick7ca; 01-01-05 at 10:29 PM.
#13
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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..
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..
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