'91 missing and would like a second opinnion

[tccrab]

Originally Posted by ZR-1Mikko

before I pull the plenum one more time I have couple things I'm wondering if anyone would happen to have answers for?

So if I pull the injectors to check for leaks can I just connect the battery and turn the power on from the key to prime them or what would be another way to prime them?

Is it possible to ohm out the Dis module to see if it is failing? Or should I just borrow someones Dis and swap it?

With the plenum off you can pressurize the fuel rails and actually fire individual fuel injectors and see them squirting fuel.
With the battery disconnected, pull the yellow plug out of the ECM. This the one closest to the outside of the car.
There are 24 pins in the plug, 4 rows of 6.
Put the battery cables back on and turn the ignition key to the 'ON' position.
The fuel rail is now pumped up.
Using the following chart (is for '90 - 91's, others are slightly different) to determine which pin in the yellow plug goes to which fuel injector. For example, Fuel Injector 1 for cylinder 1 is Y1, position 1 in the first row of the yellow plug.
All you need to do to fire fuel injector for cylinder 1 is apply a good ground to pin Y1 and looking down the appropriate injector housing hole you can visually see the injector squirt fuel on top of the valve.
Use a very thin wire, nothing larger than a small paperclip.
DO NOT, I repeat, DO NOT use anything that is larger than the male pin on the ECM itself to ground out this circuit.
If you stretch the female pin inside the plug with too large a wire it will FUBAR the connection and it could take you YEARS and $$$ to figure it out and fix it!!!
(don't ask me how I know this, just accept it to be fact.)



Tom