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.    
Pontiac Bonneville Ignition Module Keeps Blowing

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