i have a 1989 iroc 5.7 tpi w/ 50,000 miles.i am having a no start problem i have spark to the plugs, fuel to the fuel rail ,but no pulse to the injectors i am checking the injectors with a noid light. i would greatly appreciate any help thank you

 

Verify the INJ1 and INJ2 fuses are intact. Watch the SECURITY lamp when you first turn on the ignition and before cranking the starter. Does it turrn on for about five seconds then turn off, or does it remain on or flash?

 

INJ1 & INJ2 fuses are intact. checked both sides of fuses w/ test light hot on both sides .checked the injector plug also the a&b plug are both hot a&b being one black one black w/ pink stripe.watched the security lamp it is on for a short time when ignition is first turned on then off.cranking but no pulse to injector,thanks for the reply anymore help would be great.THANKS

 

Did you get a fuel pressure reading, or just test for the presence of fuel? There should be at least 36 PSI at the rails.

 

Have you checked the ignition module in the distributer? If the ECM is not getting pulses from the distributer then it will not send signal to the injectors.

Not sure if the V6 setup is the same, but I think its similar. You can test the distributer module by doing the following.
Disconnect the 4 wire connector and using a test light connected to 12v, touch the terminal C (ppl/wht wire). Does the injector light blink? If so, then the module may be faulty.

Also, the fuel pump should turn on for 3 seconds when you turn on the ignition and then shut off if there is no signal from the ignition module to the ECM. You can watch the fuel pressure to determine this. The fuel pressure will drop a pound or so when the fuel pump shuts off.