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sprinkles08, ASE Certified Technician
Category: Chrysler
Satisfied Customers: 22830
Experience:  ASE Master & Advanced level certified, Chrysler Master Certified, Trans and Hybrid Specialist
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1999 300M 60 mph down the hiway and dies. Good fuel pressure

Customer Question

1999 300M 60 mph down the hiway and dies. Good fuel pressure and electric. Let sit 10 minutes, fires and runs 15 minutes, dies. Checked all relays and fuses.... fine. Re-starts and runs for 10 minutes, dies. Let sit 15 minutes and re-starts for 5 minutes, dies. Will not re-start again. Towed home.
Submitted: 2 years ago.
Category: Chrysler
Expert:  sprinkles08 replied 2 years ago.
Hello and welcome to JustAnswer! There are quite a few things that could be causing the engine to die. IF you verified with a gauge that fuel pressure stays constant as it dies then you can rule out a pump or pump wiring issue. The first step in diagnosing the problem will be to check for fault codes. MOst things that will cause a dying/no start issue will set a fault code. You may be losing spark due to a cam or crank sensor, ASD relay or wiring issue, or the powertrain control module may be going down. IF the PCM is going down then there won't likely be any codes set in it. If there are no codes stored then testing will need to be done at the time it's acting up. The PCM will need to be checked for response and go from there. IF it isn't awake then its powers and grounds would need to be tested before condemning it.
Customer: replied 2 years ago.
No fault codes
Expert:  sprinkles08 replied 2 years ago.
What should be done is check for PCM response at the time it won't start then.
Customer: replied 2 years ago.
tell me how to check pcm for response it wont start
Expert:  sprinkles08 replied 2 years ago.
A scan tool would be used to see if the PCM communicates.