Ignition module failer
1997 astro Ticks over fine but when running with areal time reader connected showed intermittant missing on all 6cylinders. This is after changing module due to engine fail to start, due to very low output from HT. Changed ignition module. Repaced module had the same simptoms as now, tick over ok but missing on load.Seed to run ok for about 1 mile
Cars & Trucks
Answers & Comments
The coil shud be testd-causes many ignition issues--also computer cud hav problems with fuel injector drivers
Check fuel pressure. And check for vacuum or air leaks- vacuum hoses, intake manifold gasket, the big air boot to throttle body assembly. Any trouble codes?
How is output from HT now? Do you have a blue snapping spark at the spark plug wires now? If spark is weak, it might be a crank position sensor- it can be tested to some extent, and should have a reference voltage to it, about 5 volts.