jimtanner

Can somebody tell me if I can check the injector pulse with a multi meter? I don't have a noide light. What reading should I get ? Does the injectors get the pulse from the ignitor or ECU? It sounds like their all clicking but 1 is not spraying. THANK YOU for any help

BLKNBLU

iTrader: (1)

Here is all I've got.
http://personal.utulsa.edu/~nathan-b...31injector.pdf
Hope it helps.

The link comes from this site which I've found immensely helpful for just about everything on my '86
http://personal.utulsa.edu/~nathan-b...fsm/index.html

dcg9381

Pulse width is going to be in milliseconds. Can you see a light being lit for 1-2 ms?

You need an oscilliscope if you really want to measure pulse width.

To test your injectors you can use a test light (12v). LED would be better, but a light will work.. It'll look bright, maybe flucuating slightly.

If your injectors are firing and you don't have fuel, suspect fuel pressure.
Injectors can be tested, cleaned, w/ new o-rings at witchuntere.com for $15/each.

Ecu determines when the injectors will fire. You'll see constant 12v at the injector (between injector and ground) with the ignition on. The ECU grounds one side of the injector to fire them.

jimtanner

Thank you guys for your help. I will check those things soon .

Flash319

Pull the distributor, turn the key on, turn the distributor by hand and listen as each injector fires as you turn. This is how I check mine. The pulse from the pickup in the distributor fires the injectors. The pulse width is controlled by the ECU as I understand.

dcg9381

Actually the ECU decides when to fire the injectors.. That pulse *should* trigger an injector fire, but does not guarantee it.

You're right about the ECU controlling pulse width, but with a pulse width of 0, no injector is fired.. Might be symantics here...