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Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 8413
Experience:  I am ASE Master Truck Certified.
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I have a 2003 c15 mbn single turbo. It smokes white in the

Customer Question

I have a 2003 c15 mbn single turbo. It smokes white in the morning and misses for maybe 10 minutes then coughs and the smoke clears up. Not using oil or coolant. Also I noticed the exhaust temperature is running around 800 when pulling. I think it used to run around 900, is this a sign of anything?
Submitted: 7 months ago.
Category: Medium and Heavy Trucks
Expert:  Cat Man replied 7 months ago.
Thanks for asking your question. I will try and help you out.
Does the yellow check engine light come one when this happens?
Customer: replied 7 months ago.
No it does not come on
Customer: replied 7 months ago.
I shut it off for an hour after pulling a load and started it up and it was smoking blue but with no miss
Expert:  Cat Man replied 7 months ago.
Thanks for the information.
I would first suspect the fuel is leaking down.
This can be cause a faulty fuel pressure regulator or faulty fuel pump. Both of the items are suppose to keep fuel in the head when the engine is off. I would try the regulator first. If the problem still exist. I would try the fuel pump next.
Please reply back if you need more help or have more questions. I am happy to assist.
Customer: replied 7 months ago.
Could a faulty injector also cause this?
Expert:  Cat Man replied 7 months ago.
Yes it can. If the fuel pressure is ok. I would next suspect an injector.
To verify, a cylinder cutout test can be ran to find the problem injector.
Please reply back if you need more help or have more questions. I am happy to assist.
Expert:  Cat Man replied 7 months ago.
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.