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ChevyTech · 12-19-2008, 04:46 PM

The computer needs to receive a distributor reference pulse from the distributor module to trigger the injectors.
It is possible for the module to produce spark without the computer getting a reference pulse. A bad distributor module or wiring between the module and the ECM/PCM can cause this.

With the key on there should always be power at the injectors. The ECM grounds the other side of the injector, to make the injector open.

Many stores like NAPA in my area will test the module for free if you bring it in.

Make sure when you install or reinstall the distributor module that you use heat sink compound/grease under it. The grease helps dissipate heat from the module. Without it, the module will fail.

12-19-2008, 04:46 PM	#8
ChevyTech Registered User Join Date: May 2004 Location: Minnesota Posts: 4,620	Re: 1994 chevy silverado starting problems. The computer needs to receive a distributor reference pulse from the distributor module to trigger the injectors. It is possible for the module to produce spark without the computer getting a reference pulse. A bad distributor module or wiring between the module and the ECM/PCM can cause this. With the key on there should always be power at the injectors. The ECM grounds the other side of the injector, to make the injector open. Many stores like NAPA in my area will test the module for free if you bring it in. Make sure when you install or reinstall the distributor module that you use heat sink compound/grease under it. The grease helps dissipate heat from the module. Without it, the module will fail.