My 1989 Chevy Astro van died on the road last Monday, so I had it towed
home. It cranks but has no sparks. Since I disconnected the battery for
charging, the only scan code I can get is code 12. I followed the
ignition coil checks in the service manual and it seemed OK. I replaced
the ECM today but still no spark.
Thanks in advance,
Of course, I should have caught that.
I have seen those HEI coils short and break down.,I think this is a pretty
common failure. You can often see the arc spot when you dissemble the
It might be worth a check.
Maybe I am way off. Son had one with the HEI system in a Blazer a few years
Seems to me a coil is mounted inside the HEI distributor, and can be removed
This is the one that can arc over to ground. Some of the aftermarket coils
didn't last very long, but finally got it under control.
Or have I just had an out of mind experience?
I had my van towed to a repair shop over the weekend. The diagnosis was
indeed a bad distributor, and had to replace the enitire distributor
Thanks to all your help, but I am still not sure why no scan code was
registered even after I replaced the ECM in vain.
p.s. the ignition coil is mounted outside the distributor.
There is no scan code for an ignition failure.
Well, there is, code 12 (which you did retrieve) but code 12
shows up normally when the key is on and the engine is not
Code 12 = no distributor reference pulses received by the ECM.
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