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cumminsdr, Mechanic
Category: Medium and Heavy Trucks
Satisfied Customers: 3621
Experience:  All types of Cummins applications
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Have a cummins isb cm850 sets a code spn94. runs fine for

Customer Question

have a cummins isb cm850 sets a code spn94. runs fine for 30mins or so then starts losing power and jerking eventually stalls. After a cooldown of about 10 to 15 mins will start back up and run. We have replaced injectors, and frame mounted lift pump.
Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Expert:  cumminsdr replied 1 year ago.
What is the engine serial number and the entire fault code spn 94 Fmi???
Customer: replied 1 year ago.
Serial number 46586223
Expert:  cumminsdr replied 1 year ago.
Thank you spn 94 only means fuel.. Please provide the entire fault you are receiving
Customer: replied 1 year ago.
That's all it showed, only when it's running bad.
Expert:  cumminsdr replied 1 year ago.
It should show spn 94 fmi?? There are so many fuel faults that i cannot isolat without the FMI. you may need to have Cummins hook up to the ECM and retrieve the entire fault to properly troubleshoot
Expert:  cumminsdr replied 1 year ago.
Do you still need assistance? did you find the test of the fault code?

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