MY VEHICLE SHUTS OFF AND WILL NOT RESTART AGAIN UNTIL IT COOLS OFF FOR AWHILE.WHAT CAN BE CAUSING THIS?
2001 Ford E-Series Van
July, 10, 2012 AT 8:29 PM
Vehicle drives fine then suddenly shuts off as if someone just turned the key to turn off the vehicle.I have to allow the engine to cool off for about 20-30 minutes then the vehicle will start up drive for a few more miles then shut down again.I have already replaced the CPS sensor. It improved the overall drivability of the vehicle but the shutting off dilema persists. Vehicle is a 2001 Ford Econoline E-350 ambulance conversion, 7.3 diesel engine.
All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.
Every engine requires spark, fuel and compression to run. That's what we have to look for.
These are the basics that need to be tested and will give us the info required to isolate a cause.
1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.
2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.
3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.
Once you have determined which of these functions has dropped out,
you will know which system is having the problem.