I have 2000 plymouth Neon, I just bought this car off a friend and it had a seized water pump and busted timing belt. So I replaced both along with a new belt tenstioner. I also replaced the cam and crank sensor while I was at it. So the problem with car is it starts up fine when cool and runs for a while, but it randomly stalls and sometimes starts right back up but the other times I have to wait like 10-15 mins for it to start again. By randomly I mean it could drive a couple miles or sometimes only a couple yards before this happens again. Has anyone had this problem or have any idea what is could be. I'd very much appreciate the help.

 

So many things could be wrong. You have to check them all.

If your car only stall when it's hot then it could be the gas pump.
The gas pumps on many aged cars stop working when they get hot. You have to let them cool down before they start to work again.

Also the coolant temperature sensor, the oxygen sensor, and the knock sensor. I would pay more attention to those.

 

I don't think it's the pump if checked to see if the injector getting fuel while someone is cranking the car over and they do, what psi should it be putting I'm guess around 40-45 right. Now as far as the the other sensor how do I check them. I figure the coolant temp sensor is fine considering its sending signal to the gauge and it dosent fluctuate. As far as the knock sensor how would that turn the car off, of I where disconnect it when it stall shouldn't it start right back up and throw a code for it. Now the O2 sensor is the their a way to check that with a voltage meter to see if it's bad. Or are these parts just replace and pray the problem is fixed.

 

When the knock sensor failed, it can causes your car to hesitate and stumble. Every time there is a knock, the knock sensor send signal to the ECU. The ECU will delay the fire. So many knocks continuously can stall your car.

As for the coolant sensor if it failed, the ECU will think the engine is running cold so it will feed a lot of gas to the cylinders. Too much gas will flood the cylinders.

I haven't checked those sensors on my car before but I read people check those sensors with the voltage meter. If you replace them all, it will cost you a lot of money and your car might still not running.

In the past I think I had the same problem with my cars. It turned out to be the knock sensor, oxygen sensor, coolant temperature, and MAF sensor every time.

 

If the gas pump failed, it will be hard to detect.
Like I said "it failed when it get got". When it's running cool, you still get fuel pressure.

Let just hope it's not the gas pump because it will be hard to replace.
Work on something easier first, like the sensors.

 

You was right about the coolant temperature sensor, but I remember I read somewhere. They say the gauge use a different sensor to measure the temperature.

 

Ur right Im going to test the fuel pump when it stalls and check if it has low psi. As far as testing the knock sensor and coolant sensor with a voltage meter how do i do that and what kind of volts should be coming out if I'm putting 12 volts (I figure) in.

 

Last time my sister's 2000 Dodge Neon was randomly stalled like that, until it sat in the garage, did not firing up. It turned out her car was running on 3 cylinders the whole times. One of the injector did not feed gas to the cylinder. I replaced that injector, and the car fired up right away.

 

Another thing I did yesturday was when it stalled I check the coil pack. Alll four connectors and none of them had spark while I had someone cranking it over. but after we waited it fired up and I checked the coil pack spark and they where all firing fine.

 

How did go about finding out it was a fuel injector or testing them I would say