Oil injector nipple had no vacuum source – was oil getting into engine?
 

Today I noticed that both of my OMP injector nipples are open with no vacuum/boost source. So, does this mean that my engine has not gotten any oil injection from the OMP?

I believe the engine has been this way since it was built about 7,000 miles ago... I have no idea why :dunno: . Is this an issue I should be worried about?

Where is the best place to connect these nipples to? Can I just tap off of a UIM nipple?

Thanks.

Pictures...

The oil injector "vacuum" lines feed from filtered intake air:

http://img521.imageshack.us/img521/6...ram28ssdz8.jpg

The rotors should have oil as long as your injectors are not clogged.

=Ben

Do not use a source that sees boost.

Easiest way is to use a threaded nipple in the end of your air filter with a large washer to prevent it from getting sucked in.

Thanks guys.

So it seems that tapping a line at this point would only produce very little vacuum and no boost. What's the point of connecting these lines, and is there harm to leaving them open?

There is a 18 gazillion page thread on this subject that recently was en fuego, just search for it ;)

Supposed to keep the motor from sucking all the oil out of the lines at shutdown to prevent smoking when starting back up. If they could just be vented why wouldn't mazda put a small vent filter on them like the solenoids? I hook them up like the stock setup. There is a reason.

^ I wonder if the reason mazda did that was so that there is less of a chance of the line being cloged.

John

The only way those nipples will ever see vacuum is if your air filter is BIG TIME clogged up.

Mazda vented those to the primary turbo inlet elbow. I think the rationale is the nipples could have oil or gas vapors coming from them, which is an emissions problem. Any emissions vapors have to be sucked into the engine, burned, and scrubbed by the cat.

Regardless, you're OK. The nipples do not see vacuum ever, so leaving them disconnected is just like leaving the vacuum line off going to the oil fill cap, except this won't make a mess :).

Dale

the lines just prevent debris and crap geting inside. Like others have said, I also have both nipples connected to my air filter.

Thanks for the help guys. Dale, after reading more on this, I agree 100% with you that Mazda just had them feeding back to the intake for emissions. I originally thought the vacuum somehow helped pull oil through the lines.

I'm just going to connect them to a small filter since that's the easiest solution.

injector nipples
 

I saw that on my engine so some reason both nipples where connected together with a T piece but instead of vacumm the other side of the T piece was plugged into the inlet manifold

So instead of vaccum , the injectors saw boost as well . How bad is it?

The intent of the vents on the check valves is to prevent the engine from sucking the oil from the oil lines and cavities at idle and decel thus creating an oil starved engine upon accelleration and high loads. The metering pump simply does not put enough volume out to rapidly make up for the loss.

The hoses must be filtered to prevent debris from failing the check valves or worse yet plugging the little oil orifices.

To subject the vents to positive manifold pressure would probably not affect much other than possibly damaging the check valves. To subject the vents to high engine vacuum woud cause the check valves to remain closed and create an oil starvation situation as discussed above.

I really doubt they were routed to the primary compressor inlet for emissions due to the check valves flowing towards the engine. From what I can find out it was simply convenient for a filtered air source near or at ambient pressure.

I've been thinking at a minimum the filtered air keeps crap out of the check valves/motor when the motor is in vacuum...I'm thinking that's probably why my new oil check valves failed on me within a few thousand miles recently open to atmosphere. After a couple of off track incidents in the desert, my engine bay was covered in dust/dirt and it's very likely they sucked some up. I'll be routing mine in to my filtered catch can after I install new ones next week...