Ok I have read other post just start off, but need fresh ideas. I have a 91 rs with a 5.7 tbi swap. To start, distributor is new, msd coil, wires, plugs, c,aprice chip, have injector pulse during crank, changed module with spare, have voltge to coil, grounds all check out, new knock mod. Using same knock sensor, bought new can't findx it. Have volage on trigger wht/tan. ??????????? Any other ideas

 

Have you had the module and coil tested? Not unheard of any more for new parts to fail.

 

I switch the module with another one and I'm starting to think that the MSD coil I bought is bad

 

Good possibility. Since the injectors fire during cranking, that means that the distributor is sending reference pulses (DRPs) to the ECM. These DRPs originate from the pickup coil and are buffered by the ICM. The ICM then sends the DRPs on to the ECM.

The ICM should also be charging the coil and firing a spark plug on each DRP.

RBob.

 

MSD coils are mostly made in China; the OEM coils are all you need and much less expensive.

Might want to look at the second section of this article:
http://www.chevelles.com/techref/ftecref5.html

 

Ok new coil, another module, checked ground s, tried 5.0 chip, bad ECM? TRYED pinning it out last night to see of had any signal on signal wires with a old bulb type test light did not see anything while cranking not sure I did it right, going to check for contunoty in signal wires now. But any ideas?

Bad Ecm?

 

Unlikely. Unplug the 4-wire connector from the distributor. This takes the ECM completely out of the equation. Note that the injectors won't fire, which is good as they won't flood the engine.

But the spark plugs should still fire. So can continue to troubleshoot. Note that the knock system has nothing to do with the lack of spark.

RBob.

 

That did not do anything, the ECM sends the signal to open and close IcM to create a ground to create spark. I probed out the harness and have continuity. Last possible thing is a circuit in ECM
is burnt. Any last ideas. Because thenly thing that is old is that

 

Not until the engine is above 400 RPM does the ECM control timing. Until then the distributor fires the spark plugs at the base setting. Same as having the EST/BYPASS connector open.

The two wire pigtail between the ICM & coil may be bad.

RBob.