Engine dies while driving?

**AZGPrix** · 03-23-2015

Hi my name is Curtis. I am new to this forum. I recently purchased an 03 Grand Prix V6 3.1L. The vehicle has over 200,000 miles but runs very good, well it did. My vehicle has been dying on me while I am driving. The firs time this happened I was making a right turn at a street light when my car died, I coasted into a parking spot and could not get the car to start. The battery had a full charge and car cranked but no start. I towed my car home that night. The next day I tried again and the darn thing started. Don't know how but it started, so I drove to the corner store and back and had no problems starting.

A few days ago my wife was running errands and was on her way home when the car died again. She stalled and had some good Samaritans help push vehicle into a gas station parking lot. She called and I was less that 5 minutes away. By the time I got there she said the car started so I followed her back home.

So I get the car back home and I am thinking the fuel filter is clogged or the fuel pump is going out. So I check for fuel pressure under the hood at the fuel line. Now I don't have the tools to check the system properly. Long story short I have replaced the fuel filter and fuel pump and have the same results. My car still stalls when it heats up it seams. I don't want to guess at what is wrong or replace anymore parts that may not need to be replaced so if anyone has any suggestions or advise I would appreciate your input. Thank you.

**02NavyBlue** · 03-23-2015

Most likely a cam/crank sensor issue. They always cause it to stall, but work once its cooled off a bit. I'm pretty sure the 3.1 is known for both to go bad but I'm not sure. I'm not a 3.1 guy, most have 3800's but maybe someone will stop by that knows more about them.

**Seachicken** · 03-24-2015

x2 on crank sensor, Also when it "stalls" does it sputter or does it turn off like a light switch.

fuel pump relay?

**AZGPrix** · 03-26-2015

The car does not sputter but I can tell that the vehicle will cut off before it actually stalls. It just stalls. I was told that it may be the ignition module or maybe the ignition switch. I am having an issue with automatic headlights and heater control unit. Key comes out of ignition switch with car on, key is a little worn. Have not checked fuel pump relay. Is there any way I can test the fuel pump relay?

**Seachicken** · 03-26-2015

Originally Posted by AZGPrix

The car does not sputter but I can tell that the vehicle will cut off before it actually stalls. It just stalls. I was told that it may be the ignition module or maybe the ignition switch. I am having an issue with automatic headlights and heater control unit. Key comes out of ignition switch with car on, key is a little worn. Have not checked fuel pump relay. Is there any way I can test the fuel pump relay?

Are you saying you lose power to the entire car when it has a fit?

When a car sputters berfore it stalls, I usually look toward fuel first. If it has "fast stall" usually means you lost spark. Could be a few things, ignition switch, bad pcm, ignition module, crank/cam signal lost, bad connector somewhere.