No injector pulse - 1991 Chevrolet Caprice

does it have spark ?
No Start No injector pulse shorted injector part 1

No Start Testing Basics Spark Injector Pulse and Fuel Pressure Hyundai...

GM Bypass Ignition System Operation part 1

If you watch any of these ,watch the last one .Ignition control module can cause no injector pulse but still have spark

Hi Fred:
I;d be checking the cps.

no injector pulse - DodgeForum.com

dodgeforum.com/forum/2nd-gen-ram.../269362-no-injector-pulse.html
Nov 21, 2010 - no injector pulse 2nd Gen Ram Tech. ... but was running and driving fine before. as far as i can tell i have no injector pulse. tested with a noid ... No spark AND no fuel injector pulse ONLY when van is cold ...
Nov 18, 2013
2000 ram 1500 Has spark but no injector pulse wont start ...
Jun 25, 2013
v10 RAM no start....frustrated
Sep 19, 2011
help - no spark, no injector pulse, no run
Oct 30, 2009
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The injector ground circuit must not be working. What causes the pulse is when the computer internally grounds the injector circuit, power is passed across the injector solenoid terminals. All the injector grounds are spliced together on each bank of engine, and run into the computer. So, injector power, but no pulsing would seem a computer malfunction as long as the ground wires are good. Did you check all the injectors for pulse with the noid light, or at least both sides of engine?

I would check the wiring harness for the injectors

Should have 12 volts with key on-- to all injectors,same
as the ignition coils

Ignition or Injectors are turned on by PCM Drivers

Do not put any voltage to injectors they are pulsed

what vehicle? injector pulse controlled by computer. the computer recieves a pulse from crank angle sensor, or distributor pick up, etc.
then controls injector pulse. Mass air flow on some vehicles determines spray pattern

Lost injector pulse. First injector power is supplied by (IGN+) or fues block ,The injector are multi-potr not individual they are fired together,not individually, Now if you lost injection pulse youll need to inspect the Distributor,the pick up is highly suspectable to terminal corrosion, it corrodes easily,so be ready to replace the pick up with a module, (this is spark I know we are on Injector), Do you have spark, then leave this alone, Test injector pulse not at the injector because again its bank fire or group fired You ll need to test thes the connector harness connector,of the injectors.As long as there is spark you should have injector pulse from the injector sub harness connector make your way to the ECM , The ECM controls the energizing of the injector with a transitor or quad driver,they are synchronized to primary ignition . Here a solution if no spark correct for spark. Its either a Distributor pick up failure with ICM module.Do this only is you have no spark.If you have spark and no Injector ,replace ECM

sounds like u got no injector pulse comin from ecm.we need to pull ecm codes an review them ,possible camshaft sensors faulty they usually provide reference pulses to ecm for injector firing or pulse.without this pulse ur injectors will never open up to let fuel enter combustion chamber. one way of checking pulse is to connect a noid light(small light bulb that plugs in injector pigtail to chek for power to injector and ur pulsing ground coming from ecm to injector) an test for a blinking light while cranking engine.

Check all injectors with a needle stethoscope. Unplug electrical connector of bad injectors, and check the signal with (injector check light). The light must pulse. If not might be a bad computer. If yes replace bad injectors with new one. Hope will help.
This is a free advice. Do not rate me.

Injector pulse comes from Cam sensor, If you have a BAd CAMSHAFT sensor you will not get injector pulse, replace sensor and that should solve your problem. Good Luck and thanks for using FIX YA