camaro350tpi

hi all , i have a 89 camaro with a tpi and i want to know if someone have a idea how to test the injectors ,i know i can verify the ohms but it dont tell me if it realy works .....

Vader

That is correct. Checking the coil resistance of an injector will verify whether the coil is electrically intact.

However, that coil must operate a solenoid core which is attached to a pintle in the lower end of the injector. The pintle must move to allow fuel to flow through the injector. There is no way any electrical test can verify that. You could measure current to the injector while firing it, and if the initial pull-in current does not drop slightly once the injector is energized, that might indicate a stuck solenoid core.

Even if the current test appeared to produce correct results, that would not necesarily mean that the pintle is still attached to the core, or whether the pintle is actually opening, or even if it did open, whether any fuel was being allowed to flow through the injector, let alone at the proper rate or with a proper spray pattern.

That's why there are professional services in the business of testing, cleaning, and flow-matching injectors. If the solenoid coil is intact, the injector might be worth further work. If the resistance test indicates a low resistance coil, the injector may be failing electrically, but that's all you'll learn from that.

Denis.V

I tested my MPFI as follows:

I pulled off the TBI.

I pulled off the complete fuel rail with the 6 injectors and the fuel lines/hoses connected.

Then, I put the complete fuel rail around 10 - 20 cms. over the engine supported with a jack and others help elements.

I put a long piece of solid paper under each "injector line" (one paper for the 3 left injectors and other paper for the 3 right injectors), having care in order to keept the same distance from each injector pintle to paper.

Then, my wife started the engine and WOUWW!, I saw the injectors flows, the injectors patterns, the 5 injectors working and what was the injector not working, and the fuel circle size printed over the papers.

This was my homemade injectors test. I took 1 or 2 pictures but I don't remember where they are.