Have you checked the air to air and hump hoses, also check the bellows between turbos and cooler, if they crack (which they are known for) fuel mileage will suffer.
C15 accert coolant diverter valve problem
Discussion in 'Trucks [ Eighteen Wheelers ]' started by E model Cat man, Jul 5, 2016.
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You're also winding it up to high before shifting, it'll do nothing but eat fuel over 1600.
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If it's making 55psi of boost and suffering from poor fuel mileage verify the exhaust isn't plugged. Also you need to monitor readings on CAT ET to make sure readings are within spec. In order to achieve boost you need fuel so it makes sense both of these symptoms happened simultaneously.
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My mxs is running hot on water and oil temperature side popped some coolent hoses when replacing them found precooler was paying coolent not much but had some dried up changed out solenoid to devrtervalve and noticed it stays hot you can't touch it
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Oxbow Thanks this.
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