Help needed with 05 Impala 3400

[ebb]

My GMC had issues for months and I sent it to a friend out in the glades. He is an auto computer genius, he hooked up his lap top and tested a bunch of stuff and it was a crankshaft position indicator. Mine would start and run for long enough to get hot then shut down. Mine was a 6 liter P/U. worth looking into.

[Hannibal]

I think I'm going to roll the dice and try a salvage yard early in the morning. Before all the 'tweakers' show up. Pretty sketchy place at times.

[funnyjim014]

It's not a head gasket. It will run but spew coolant. With out a scan tool to look at data your throwing darts at the wall. Take it to a shop

[Hannibal]

It's not a head gasket. It will run but spew coolant. With out a scan tool to look at data your throwing darts at the wall. Take it to a shop

Yeah, well I'm not going to. I have a scan tool. No codes. And it ain't one if the cheap ones.

There are help wanted signs everywhere I go. Auto shops aren't immune to the lack of warm bodies that will even show up, let alone people who know how to diagnose problems. Dealerships are no exception.

I could point out a really good reason why that is but I don't want this thread to go to the pit so I'll just stop now.

[Hannibal]

As an aside, the last time my stepdaughter took her older car to the dealership to diagnose an air conditioning problem they came back with a laundry list of $3K in parts and hadn't even taken anything apart yet. I replaced the Schrader valves, pulled a vacuum overnight and recharged it. That was about 18 months ago. Less than $100 in parts and refrigerant.

Not impressed.

[Hannibal]

So the car is fixed. I bought a used ICM at the local salvage yard for $30. Installed it. Started right up and test drove it. Runs as good as it has since I've owned it.

Thanks to everyone for your input. I appreciate it.

As an aside, if you do your own work and your local parts supplier offers testing I recommend that you take advantage of that. Apparently a whole lot of folks aren't.

They'll test your stuff for free, even if you don't buy their $240 part and get the $30 one from the junkyard.

[MaryB]

So the car is fixed. I bought a used ICM at the local salvage yard for $30. Installed it. Started right up and test drove it. Runs as good as it has since I've owned it.

Thanks to everyone for your input. I appreciate it.

As an aside, if you do your own work and your local parts supplier offers testing I recommend that you take advantage of that. Apparently a whole lot of folks aren't.

They'll test your stuff for free, even if you don't buy their $240 part and get the $30 one from the junkyard.

Open up the old one... you may find bad solder joints the culprit and soldering them may get you a spare module

[abunaitoo]

No lights came on when it died????
None at all????
Did they come on when you tried to start it again????
Do they come on now with KOEF????
No codes stored????
I would start checking ground wires.
Start at the battery, check body ground wires, check ground under the dash.
If no codes, and no dash warning lights, probably a bad ground someplace.
Once with a Blazer that had a dash display problem, I tapped in to the ground wire in the dash, and grounded it.
Problem went away, and it seemed to run much better.
Just a suggestion.