Power circuit in turbocharged diesel - Ford Powerstroke Diesel Forum
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Old 04-15-2014, 02:00 PM
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Power circuit in turbocharged diesel

In a normally aspirated gas engine the power circuit works by sensing engine vacuum. When vacuum falls enough, the carburetor (or injectors) sense the drop and actuate the secondary power power circuit, resulting in an increase in acceleration or power, as in pulling a load as needed. Of course this is all started by standing on the accelerator pedal a varying degree. How does this system work in a turbocharged diesel engine. There must be sensors that tell the computer more power is needed. They might be a throttle position sensor, or a boost pressure sensor or a load sensor of some sort. I have a problem with massive amounts of black smoke if I have to accelerate hard and it usually starts if I ask the engine to downshift the transmission to passing gear. I can't figure it out and it is killing my fuel mileage. I have new injectors so that is not the problem and engine tests show all cylinders contributing roughly equally. Anyone have any ideas? Thanks for your help.
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Old 04-15-2014, 08:56 PM
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are you tuned? running a programmer?

what boost are you running at? egt temps?

i would say you have a boost/drive pressure leak but hard to tell.

could be low oil pressure as well.
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Old 05-27-2014, 12:36 PM
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Sorry it's taken so long to answer. I've had computer problems. Anyway, I do have a Superchips programmer set to fuel save mode. I put it back to the stock file and I get some mild smoking on hard acceleration but I only get 12" of boost at most. The programmer gives me about 22" on hard acceleration/heavy load so maybe I do have a leak. I have a new high pressure oil pump and I had the smoking problem before it was replaced so that is not the problem. I don't know the egt but engine and trans temps are normal. It seems I could hear a pressure leak but I don't know how else to find it.
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