Medium and Heavy Trucks
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Thanks for asking your question. I will try and help you out.
When you say try to die, do you mean it does not shut off?
Thanks for the information. Does the red or yellow engine light come on when this happens? Or no lights or codes?
Thanks for the information. Has the fuel pressure been checked with a psi gauge when this happens?
Thanks for the information. I would have a psi gauge connected to the fuel system first. It's possible the fuel pressure is dropping. I have seen this before. The fuel pressure should remain between 75-90 psi at all times. It its low, you have either a faulty fuel pressure regulator or weak fuel transfer pump.
If the fuel pressure is OK, I must suspect the engine ECM. Since the ignition switch and relay have been changed. I would suspect the ECM. The tough part is the only way to verify is to install a known good ECM.
Please reply back if you need more help or have more questions. I am happy to assist.
Yes that's it. I suspect either a low fuel pressure condition or faulty ECM. I would check the fuel pressure first.
Hey. I just wanted to see how things were going. Please let me know if you need more help. I am happy to assist. If my information was helpful, please leave a good or higher rating so that I receive credit. Thanks.