1993 Pontiac Bonneville 3.8L
Repairs= The car has had the ignition module replaced and the crank sensor replaced.
Question = Hi I was searching around and found your site and can tell you guys know what you're
talking about.  I have worked on cars at a dealer for 15 years and know a lot about most things, but
you always get a basket case now and again. This Bonneville keeps blowing the
ignition module.  It
came to me and the owner said a shop had already replaced the ignition module and drove the car
about 2 miles and it died.  They then replaced the crank sensor and the car still wouldn't start. I got
the car and checked the ignition module by doing tests for the 3x and 18x crank signal checked for
power and ground at the module blah blah blah.

I put on a new ignition module the car ran great.  The alternator was charging around 14.3 or 14.5
volts.  I drove the car less than a mile the car died and needs another ignition module.  The ground
from the battery and everything is right below the module on the head and the ground wire to the
module was good so I don't think it is a ground issue. I am at a loss here and really think it must be
an overcharging or voltage spike issue, but like I said it seemed to charge NORMAL voltage.  The
coils maybe?  I'd like any help you could give.  Please and thanks, Ben


Answer: Talking to the guys we have never seen something like this. About the only thing we can
think of to keep blowing an ignition module is a bad coil spiking the  module. I have seen several
times these
3800 ignition coils have a crack in one and under a heavy load will arc to ground
through the module. Try spraying a little water on the coil while doing a brake torque to see if spark
jumps out of one. You would hear it and see it too.

Make sure the ground is good. The module gets its ground through the bottom of the module on the
bracket. If there is corrosion, that will effect the ground resistance. Best to check ground
continuity
with a
DVOM from the car to the negative battery terminal.    
;

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Pontiac Bonneville Ignition Module Keeps Blowing