5.7 TBI new gm distributor[all new internal parts]new gm coil voltageat coil no spark. rotor turning all mechanical parts working

Is there a tach place on the distributor cap? If so, use a test light on that terminal, engine cranking, see if the lite pulses? A pink wire should carry voltage to coil or distributor cap. It goes got with the key on? Use a test lite and check for voltage. A couple of possibilities, check the ignition module and pickup coil in distributor. Does the distributor rotor turn when you crank it? With gm bypass ignition, it's the ignition module that controls spark during cranking rpms, not the computer.
There is an oil pressure switch in the fuel pump circuit, so once you crank it enough to bring up oil pressure and that switch closes, the fuel pump will run even w/o a rpm signal, but, for other components, the rpm signal is important.
The ignition module gets signal from pickup coil, engine cranking, then ignition module sends rpm signal to computer on purple wire with white tracer. If no signal, the computer won't ground the fuel injectors, among other issues.

Check if you have spark (coil or ignition problem) Next consider what you did when rebuilding the TBI as there may be parts that will only operate in one way or settings that have to be adjusted. Lastly is the new ECM compatible with the system (immobiliser) Use a scanner to reset the ecm program

-Sounds like bad igniter. But make sure check fuel pressure as well.

Good luck

Mai

plastic distributor ? wrong screws in rotor? timing?

First does the rotor turn when cranking engine?? possible timing chain is out or stripped gear..are you sure it has no spark??did you verify this with a high output spark tester ? did you spray starting fluid in the tbi unit ?

The EST if for timing ****** when a spark knock occurs it works with the knock sensor.This is not the problem what you are dealing with. if something is affecting the idle.The idle specs are 675 to 775.open the concealment plug and make your adjustment there

That is indeed odd. I would suspect problems with the hi tension cables if this was not part of the ones you changed since the flow of current ends at the distributor. Check also other cables such as the ground. It is puzzling that all plugs would not have any spark. I would also recommend a scanner used to check for error codes given out by the car's ECU.

Hi. Changing the coil first was a good move. Since it did not solve this illusive problem now change the plugs, wires, distributor cap and rotor and I believe your problem will be solved. Joe

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Check the resistance of the pick-up coil in the distributor. Reading should be between 800 to 1200 ohms. Disconnect the two wire connection at the distributor control module to measure the resistance.
Let me know.
Regards,

First thing to do is change the cap and the rotor in the distributor.They can cause the car to just die like tha tbecause the rotor can burn through or the carbon button in the cap can wear away. Both these can cause the spark to go directly to ground.The ignition module or pickup in the distributor could also be the cause.Very common failure items in older GM's.