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Wednesday

Stalls And Dies At Stop Sign?

2001 Chrysler PT Cruiser stalls when come to stop at stop sign/red signal.
Then it will not start have to wait few minutes then starts.
No check engine light and no error codes stored.
The vehicle drives/runs fine,but only issue is noticed on stop sign or when brake is applied to slow down.The sudden stalling is noticed.

HOW TO START TROUBLESHOOTING THIS PROBLEM?


First notice what type of stalling you notice.
Is it running rough or running out of power as you slow down and then stall and then dies.
OR
It just stalls and then dies abruptly without you noticing its rough or out of power.

WHAT IS THE POSSIBILITY IF ITS RUNNING ROUGH THEN STALLS AND DIES?


If you notice its running rough and loosing power then stalling after you slow down at stop sign,then its issue with fuel pressure.The pressure is not getting maintained.When at speed the fuel is flowing right but when vehicle gets slow the pressure is low to keep the engine running and so due to lack of fuel it stalls and dies.

AND WHAT IF VEHICLE STALLS ABRUPTLY AND DIES?

If that is the cases then its due to spark related.

If it dies abruptly that tells us that you are very likely losing spark. If you were losing fuel pressure it should run rough and run out of power as it dies somewhat slowly.

SO ITS EITHER FUEL OR SPARK RELATED ISSUE.
WHAT POSSIBLE PARTS NEEDS TO BE CHECKED?


In such cases the problem is something very minor( not always).But there are multiple possibilities.You have to inspect all possible causes that can lead to such problem.
The only way to know exactly what is going on is to do some testing at the time it's acting up.Because mostly the vehicle is running fine at speed.But stalls when you slow down.So first let the problem occur.Drive you vehicle in your garage and let the stalling problem occur.Then start troubleshooting.

Most Possible causes would include
  • The problem with  powertrain control module (PCM), 
  • Faulty/worn/weak camshaft position sensor, 
  • Faulty/weak/worn out crankshaft position sensor,
  • The faulty coil pack itself, 
  • ASD relay, 
  • And wiring to any of the components. 
This possibilities can cause such problems.
Any of these problems normally set a code but not always.In your case there is no error code set.So you have to inspect all this parts one by one and get them tested.

At our car repair garage for this types of problem,we mostly notice issue with the cam or crank sensor.


OK,WHERE ARE THIS SENSOR LOCATED?


On your 2001 Chrysler pt cruiser the CRANK SENSOR is located on the back of the block and reads off a tone wheel on the crank.
And the CAM SENSOR is located on the left end of the head and reads off a tone magnet on the end of the intake cam.

WHY  THESE SENSORS CAN CAUSE THIS PROBLEM?

This is because these sensors are needed for spark and the engine will die if either signal is lost.
Both these sensors send signal to vehicles computer module.If the module is not receiving correct signal from this sensors or any of the one sensor,then vehicle is stall and abruptly die.

WHY THIS SENSORS FAIL?


There are many reasons for this sensors to fail.Sensor getting old,dirt getting collected on sensors,sensor wires getting short.
On most of such cases the sensor gets short.Sometimes both or in some cases any of the one. Since these two sensors share a common 8v supply and ground, if one sensor shorts it will also take the other one out. Since the PCM has no idea the engine is turning, if both sensors stop producing a signal at the same time, no fault code can set. Cam sensors cause more problems on these but crank sensors do fail too.

OK,AND WHAT ABOUT ADS RELAY?

Its the other possibility that can cause the problem.It supplies voltage to the coils and fuel injectors.
The ASD relay is located in the power distribution center.
To confirm if this relay is working or not,try swapping the relay with another good relay.Swap the ASD relay with another one in the box and see if that takes care of it, this way you can rule out the relay.


OK,WHAT IS PCM.AND HOW IT CAN CAUSE SUCH PROBLEMS?

The PCM is the module that controls all engine functions.Its also called ECM or ECU means engine control module or engine control unit.
If the PCM is going down at the time this is happening then you will lose spark and fuel. If the PCM went down this would also explain the lack of fault codes.
To confirm the problem with PCM.
Inspect the working of  fuel pump and the temperature gauge when you notice the stalling and vehicle dies problem.. If the pump and temperature gauge work during the period it won't restart then you can rule out the PCM. Because Fuel pump running and Temperature gauge operation,both are controlled by PCM.If PCM is good,then it will control this functions.


OK,WHAT WIRING PROBLEM CAN CAUSE THIS PROBLEM?


Yes it can be wiring problem to any of the components.
Suppose if the PCM loses a power or ground feed.
Then in that case  5v or 8v circuit shorts to ground or the sensor ground circuit short to voltage.And these can cause the PCM down. If there is an open, short to power, ground or another circuit on the sensor wiring or ASD relay circuits then it could cause it too. So inspect the wiring's.

So these are the possibilities to be checked.
As you are a self repairing person and not a garage tech.You will not have many working spares to confirm the problem.
So i recommend to First try swapping the relay since it's free. If that doesn't take care of it, then follow troubleshooting with other possibilities i have mentioned above.Like  replace the cam and/or crank sensor.
Why i suggest cam and crank sensor replacing because Cam and crank sensors aren't very expensive and there is a very good chance one of them is the problem.

OR the other option is to get the repairs and inspection done at professional repair shop.

You are now basically knowing about the possibilities that can cause these problem.So if you are not getting correct advise from garage techs then you can rule them out and go to another garage professional.

This details will help.
Thanks.



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