1992 Chevy Astro 6 cyl Two Wheel Drive Automatic 404000 miles
Have fuel pressure, Spark, 2 second prime/ keyon
12 volts to both injectors and pink V+ to computer.
Computer grounds good to chassis.
Motor will crank and sometimes pulse injectors after 30 0r 40 seconds, sometimes not. Condition gets more prevalent a temps near O degrees. I understand that pulse width is made up of several summed values but I do not know where or what generates the initial base pulse. The ECM tested good out of car. Could not test PCM. No hard codes set and no access to P codes.
Runs good once started. TPS voltage normal w/ 1.4vdc closed 4.5vdc WOT.
Monday, January 26th, 2009 AT 1:12 PM