2004 SLE just turns off at random

[MKMike]

Hope that did the trick.
Perhaps there was some slight corrosion which was just enough to mess things up.

[redfury]

After rereading this thread, I would have to agree that the ICM is the most likely culprit. I had a Grand Am that would run great cold, as soon as it got hot it would buck and backfire....the solder joints heat up and expand and lose connection.

[sdxp787]

Well, here we are again... problem is back. I swear I am gonna pour gas on this thing and set it ablaze. I recently, last week, acquired one of the GM Tech 2 Chinese knock offs. Is there any fields on this scanner that will help me locate this issue? I have a GM buddy who is very knowledgeable with the Tech 2 and he says that if there are no trouble codes, and there aren't, then the Tech 2 is not fast enough to see and log the problem... I have to think he is right. Therefore... I am lost. I did do the alternator check that another member suggested by taking a reading at the battery with the car running. But, I seem to remember seeing very high voltage readings through the Tech 2, I think over 15 volts. I will have to take a look again tonight. I love the car, but I can't put up with this issue much longer... *dang* thing only has 101K miles...

[96 SSEi]

go to the bone yard and any series 2/3 3800 icm will work - I got my 96 SSEi icm in the garage - no issues

[dougtoth]

X2.
Get an ICM from the bone yard or Andrew at Bonnevilles Unlimited.
I had same problem with my 2001 SLE (wives car).
The car would run great for a while and then just shut down.
Finally got one from Andrew and issue went away.(knock on wood)
I had bought two new ones in matter of 4-6 months and both failed.
She almost got in an accident as the car died when she was turning in front of another car.
Nothing worse than a car that suddenly dies or shuts down.
I know how you feel because I was also ready to torch the car.
I really think the problem is the ICM.
Good luck.

[sdxp787]

The icm is a new delco.

[sdxp787]

This car has had 4 ICM's... at first I was buying the autozone brand... then after 3 of them, I bought the delco.. each time the car would run flawless for 4-6 weeks... then go to crap. So, I dunno what is going on. It is either spark or fuel. I think the next step is to get some fuel injection noids to see if the injectors are shutting off when the car dies. I will have to rig up a go pro to see the noids since I can't run along side the car when driving...

[96 SSEi]

if the car ran fine after an ICM replacement for 4 weeks, then odds are the ICM IS the issue - maybe someone close to you has one you can test.

[dougtoth]

X2 again.
My second brand new ICM was a Delphi unit.
It lasted about 3 months.
I can't stress enough about the garbage electrical parts from China.
Try an OEM used unit from a junk yard or one from Andrew.
I really think this is he problem.

[sdxp787]

I would want to say that something is causing the ICM to go bad and just by putting another one in I will be having the same problem in four more weeks. So I have to find the source of this issue. And that is something I haven't been able to do.

[96 SSEi]

if it gets hot after 30 min of driving, its probably heat - it gets too hot and the *shoot* solder joints start flowing, bit, by bit.
I would get a pc case cooling fan and mount it below the ICM - direct to battery with an on /off switch.

older electronic solder was 60/40 lead/silver - high flow point...........now they 86 the lead and you get 60/40 tin/ silver or cheaper alternative

the cheaper parts have the substandard solder - lower flow point - prone to funkiness.

how is the ICM bracket? it helps to dissipate heat so make sure its good, not rotten.

scrap yard and fan is what I would do next

[Goostoff]

My 2000 SSEi has this very same problem. In fact it has now been sitting in my yard for over a year because I just said *fook* it I am done and bought another one. I did an ICM swap on mine. I actually pulled the entire coil pack assembly out of a Le Sabre and swapped them. After the swap the Le Sabre went on with no issues and the same problem persisted to keep coming back on the Bonneville. That was when I decided to throw in the towel and it hasn't been started since.