Oil injectors, aux port actuation

[Pete_89T2]

Originally Posted by FRED

Oil metering pumps and injectors don't work like it seems some think.

Read jpgs attached.

Oil does NOT go thru/past the rubber check valve at the top of the injector.

Blowing and sucking at one end or the other does not determine if the path of the oil is blocked inside the injector.

Vacuum is only seen at the BOTTOM of the injectors. The top gets what the attached jpg says..............bleed air like the bleed air for fuel injectors. Not vacuum, please.

Read my post again, I didn't say anywhere that oil is supposed to go thru/past the check valve within the injector, or imply that vacuum is used by the system in the way you seem to think I did. I realize that "vacuum" hose connects to a fresh air port before the throttle plates. I was simply relaying my test results.

Obviously the FSM suck/blow test procedure for OMP injectors is designed to check the functionality of the check valve within. For the "suck" portion of the test, I simply modified the procedure by using a vacuum pump & hose. Most vacuum pumps also have a pressure port, so you can use them for the "blow" portion of the test too. This has a few benefits - (1) You don't have to put your lips on a filthy oil injector, (2) The hose makes a better seal on the tiny injector nipple than your lips do, and (3) The test is repeatable, and it produces quantitative results (i.e., numbers on a vac/pressure gauge).