I don't expect much traction on this issue, but I am hoping that maybe someone has had a similiar experience that was able to find a fix.

Over the course of the past 2 years, my 2003 SS has been giving me a strange issue that has been increasingly getting worse.

Initially, the engine would stall when stopping or taking off from a light. Generally, the car would start back up, but as I continued to drive it, it would take longer for the engine to restart.

Now, the car will stall when driving down the street at 45 or even the highway at 75. It doesn't shutter or labor, it literally just shuts off like I turned the key off. If I let the car sit for a few weeks, it will behave fine, but eventually starts stalling the more I drive it.

To make matters more complicated, the security light is also coming on when I drive and I have been seeing the SVS light, and have yet to get GM to pull a code from it.

I am starting to think my ECU or BCM may be the cause of all my problems, but I wanted to reach out and see if anyone has had this problem as well.

To date, I have replaced the ignition switch, EGR, IAC, TPS, and MAF sensors. I have run fuel line cleaner through the system and had it with a couple of mechanics who have yet to pinpoint the issue.

Any suggestions or help would be greatly appreciated.

Thanks!

 

It might be the MAF being faulty, again. I've had several people with supercharged series 2 3800s have multiple MAF sensors be bad/go bad even those right out of the box.

 

Fuel pressure regulator or fuel filter

 

I'd pull the code first, it's free info that you didn't have before.

Has it shut off for a mechanic? What did their scan data show when it happened?

Both of the above are really good suggestions though. If you suspect the MAF, just unplug it and drive again (the engine will default to run on MAP). If it dies again the same way, you know for sure its something else.

I will say my gut feeling is that it does sound like fuel, especially with the delayed start.

 

So, found out what the issue was - a failing crankshaft position sensor. Replaced it and car runs great.

Having issues with the Passlock system, hopefully I can figure that out.