96 SL2 Random Shuts Down

Sorry I typed this last night but didn't post it



How quickly does the CEL turn on after you begin driving, both in time and in mileage?

If you do not clear the code and let it cool down an hour and then start it and drive, does the CEL ever go out before the next time it stops running?

 

When you disconnect the front O2, you remove the computer's ability to adjust the air fuel mix in real time.
I'm sure there is some default mix that it reverts to in order to keep the engine running until the front of O2 is replaced.

The question is what is that mix?

Also, did you buy an ACDelco ignition module or a cheapie? Many of the cheap ones don't even function to get the vehicle started, so at least yours was running. Interested to know the brand.

Not sure what you mean about codes being read after the shutdown. Usually you have to cycle the ignition as part of the clearing process. Were you pulling over and doing this along the way? And what codes besides those for the oxygen sensor where you seeing if any?

What is the status of the vehicle now? No crank no start, crank no start? Etc.

 

I believe that default mix is extremely rich and has the potential to dump raw fuel into your cat con which is a good way to wreck it. Highway driving under these conditions can be especially damaging.

 

Kindly answer my question just prior to your most recent post.

 

Clean the corrosion off of the bolts that go through the coil packs through the ICM into the bell housing. The coils are grounded by the copper rings around those mounting holes, through the bolts, to the bell housing. I wonder if you are losing the ground when things heat up and expand..... Do not crank down on these bolts when putting back together trying to get a better ground. You will snap them off and you did not want to have to try to drill one of these out and rethread the hole

 

You never answered if you used an AC Delco.
I have 500K mi on two ign modules that have never done that. They're expensive but they work

A car with a p0340 I would argue has a different issue.

The point of checking the bolts is to check the services you cannot see while they are attached......