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M11 cummins misssing, it idles fairly well but when I speed…

Customer Question
M11 cummins misssing Mechanic's...

M11 cummins misssing

Mechanic's Assistant: Thanks. Can you give me any more details about your issue?

It idles fairly well but when I speed it up it has a definite miss

Submitted: 2 years ago.Category: Medium and Heavy Trucks
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Customer reply replied 2 years ago
How do I get my answer?
Answered in 19 minutes by:
2/24/2016
Technician: Jackie Dempsey,
 replied 2 years ago
Jackie Dempsey
Category: Medium and Heavy Trucks
Satisfied Customers: 47
Experience: Diesel Technician at Cummins Pacific
Verified

Goodmorning! i am more than happy to assist you with your question today. Can you please tell me if this engine is an M11 Celect or Celect plus? Also, is there a check engine light present?

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Customer reply replied 2 years ago
1995 M11 330E model engine
Customer reply replied 2 years ago
I dont see anything on celect or celect plus
Technician: Jackie Dempsey,
 replied 2 years ago

Thank you for that information, are there any check engine lights present on the dash?

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Technician: Jackie Dempsey,
 replied 2 years ago

The symptoms described sounds to me like a fuel system problem, however please keep in mind it is difficult to diagnose via the internet, but I will do my best! I would like to inquire as to what (if any) trouble shooting steps you have taken at this point? I would recommend checking to ensure there is no air in the fuel system, no visible fuel system leaks, verify that the oil level is within spec as well. I have seen a few different issues result as the cause of a miss on this particular engine. However in my experience it does usually turn out to be an injector issue

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Technician: Jackie Dempsey,
 replied 2 years ago

If by chance you have verified that the fuel system is working properly, the next most common problem I have seen is the cam sensor on these units. Not the most fun to change I will admit, however very possible. Due to the older style engine it may not be the easiest to diagnose without Cummins specific diagnostic equipment. If appropriate I would also advise to bring it into a Cummins facility so they may connect Insight and verify the operations of the engine internally with the computer. You can find your local Cummins distribution center by logging into www.cummins.com or by calling 1 800 Diesels and a rep should be able to assist you. I hope that I have been able to shed some light on your issue at hand. If you have any further questions my name is ***** ***** I will gladly assist you. Please do not forget to rate my service today. Take care

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Technician: Jackie Dempsey,
 replied 2 years ago

I would like to also mention the best way to check for air in the system on these units is to hookup a sight glass to the inlet line of the fuel system and verify there are no bubbles, if bubbles are present you have air in the lines. Once again I hope I have been of assistance, please let me know if I can help further ;)

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Technician: Jackie Dempsey,
 replied 2 years ago

Hello there! I just wanted to check back in to see if you had any further questions? If so please let me know. Thank you

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