If anyone has a 2013 or close to a 2013 DD15 with a boost gauge, please help me verify something.
lately I’ve been getting a drag on the drive train and I have gone through the hole truck and nothing should be holding it back going down hill. It feels like the engine brake is coming on.
I noticed that when I let off on the hammer I’m still showing boost, something that didn’t happen before. I remember this wasn’t the case. When I’m coasting there was zero boost and now I have constant boost when in gear. Am I remembering it wrong? Is my brain playing tricks on me and this was never the case?
if you can going downhill or flat land and your coasting, do you have boost?
I’m thinking maybe just maybe my DPF filters are dirty, creating back pressure, which creates boost thus causing mpg to go down and engine brake effect without having my engine brakes actually on.
Anyone With a DD15 and boost gauge. I need to verify something.
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by LoneRanger, Dec 8, 2021.
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Anyone?
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It's been a couple years since I had a boost gauge, but I seem to remember it always showed at least something, even when coasting.
It's a good question and I'm interested in a real answer. -
Yes if you are off the throttle and just coasting down hill in gear at let’s say 1500 rpm you will get a little boost. Typically around 2-3 psi. With the jakes off. Jakes on full, you will get a ton of boost of course.
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learning as I go so not sure when the DPF filters need to be replaced. At what mileage does regeneration not help anymore? -
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Where's all the smart people at?!?
I don't believe a plugged DPF would make you show boost while coasting. Boost pressure is really just a measure of restriction. But not on the exhaust side but the intake side. If your exhaust system was plugged it would create back pressure on the exhaust side of the turbo which is what drives the turbo. If the turbo isn't able to spool up properly it won't create boost properly. Long story short I don't think that's your problem. And if you dpf was plugged it would be doggy and probably throwing codesDon379 and LoneRanger Thank this. -
Could just be a bad sensor
Don379 and LoneRanger Thank this. -
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that’s how I understand it.
also a week ago I got two box conversion errors but I cleared them and did parked regen and it’s been good so far. Although the DPF might be clean enough to not throw codes in thinking maybe it’s getting up there with the age of the truck and not sure when or if they have been replaced. So I’m going to take it apart and see what’s what.
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