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+--- Thread: ISX cm2350 low. power/poor. Fuel milage. (/showthread.php?tid=9985)
RE: ISX cm2350 low. power/poor. Fuel milage. - DPS567180 - 02-24-2025
Okay I should have Cal term downloaded and installed in the next 48 hours. I know I won't understand what I'm looking at Is there a way to post a video here or should I upload to my YouTube and post a link?
RE: ISX cm2350 low. power/poor. Fuel milage. - DPS567180 - 02-24-2025
(02-24-2025 )DPS567180 Wrote: Okay I should have Cal term downloaded and installed in the next 48 hours. I know I won't understand what I'm looking at Is there a way to post a video here or should I upload to my YouTube and post a link?Also how long should I screen record to give a good idea what's going on with my engine?
RE: ISX cm2350 low. power/poor. Fuel milage. - hhow55 - 02-25-2025
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RE: ISX cm2350 low. power/poor. Fuel milage. - Rawze - 02-25-2025
(02-24-2025 )DPS567180 Wrote:(02-24-2025 )DPS567180 Wrote: Okay I should have Cal term downloaded and installed in the next 48 hours. I know I won't understand what I'm looking at Is there a way to post a video here or should I upload to my YouTube and post a link?Also how long should I screen record to give a good idea what's going on with my engine?
just record while you get on it in a hard pull, etc.. while you think its being weak.
RE: ISX cm2350 low. power/poor. Fuel milage. - JimT - 02-25-2025
A few thoughts:
Something to check which I experienced once. The rubber/silicone elbow going from the intake manifold into the air compressor wore through and started leaking right at the corner of the 90 degree bend. Gave me a whistling sound and low power. Was hard to find because of it's location and the fact that it wore through from the inside out (probably due to soot abrasion). Maybe not your problem, but might be worth inspecting.
Also, how's you DOC, DPF and SCR? Problems there, even minor, could cause the ECM to compensate resulting in what you're seeing.
Finally, partially related to the DPF, I've also had whistling sounds come from bad exhaust bellows that start to leak. Any leaks in the exhaust system can throw off sensor readings for the aftertreatment system and cause the engine to operate poorly. Everything seems fine because sensor data is in range, but the ECM is working with inaccurate data.
RE: ISX cm2350 low. power/poor. Fuel milage. - JimT - 02-25-2025
Just reread your original post. The air compressor intake is probably not leaking, IF your pressure test included that section, but probably worth checking for signs of wear as it's hidden internally.
Another thing that you need to look at is the fuel pump and rail. The cm2350 has the famous high pressure pumps that are known to go bad after about 400k miles or so. Insite can monitor fuel pressure commanded and measured and of course watch for fault codes, though problems can be present for a while before actually triggering a fault.
Small fuel rail leaks can also create a whistling sound. Following the procedures on Quickserv carefully check all the connections and torque to specs, including the one going to the doser injector on the turbo. The rail pressure relief valve is another thing to check.
RE: ISX cm2350 low. power/poor. Fuel milage. - DPS567180 - 02-26-2025
Okay got cow term up and running. I made a screen recording going from the TA in Las Cruces to the loves about 6 miles away going westbound. There's a hill I had to climb And I thought it could show the best data. When getting on the interstate from the on ramp my boost was good actually was going 38-40 and then it bottomed out and when I hit the hill it wouldn't go above 30psi.. this load is a little bit heavier than I usually run I got 34,000 lb in the box. Here's a link to the screen recording hopefully I did it right.
https://youtu.be/8MHpG7o5sqk?feature=shared
RE: ISX cm2350 low. power/poor. Fuel milage. - SquareOne - 02-26-2025
Man, there are much more qualified eyes than mine who will be commenting soon, but that RPM vs Acc position jumps out at me.... These engines do not like to be lugged (basically high boost and low rpm (as in 1350 or less). I think the highest I'd seen was around 1580rpm. Most of the time it appeared to be WOT as low as 1115 to about 1450ish.
When we're running our trucks, we keep boost low and rpm high....1500+ unless there is minimal load. This will certainly help with longevity and mpg. Not saying it's the cause of you issue you may have, but it's certainly a start.
This is some parameters noticed in your vid others will be searching for at WOT...
CBL_Fuel_State - 47
_Engine_Speed - 1245
Total_Fueling - 267.97mg/stroke
CBR_Chi_Mode_Status - 0020
CBR_Chi_Table_Mask - 00000006
VGT_Actuator_Position - 43%
RE: ISX cm2350 low. power/poor. Fuel milage. - DPS567180 - 02-26-2025
(02-26-2025 )SquareOne Wrote: Man, there are much more qualified eyes than mine who will be commenting soon, but that RPM vs Acc position jumps out at me.... These engines do not like to be lugged (basically high boost and low rpm (as in 1350 or less). I think the highest I'd seen was around 1580rpm. Most of the time it appeared to be WOT as low as 1115 to about 1450ish.At least you understand some of it I have no idea what I'm looking at for the most part. Lol would it be the programming that will cause that issue? I've never changed anything except for the speed limiter on this thing. As far as I know this is the stock programming.
When we're running our trucks, we keep boost low and rpm high....1500+ unless there is minimal load. This will certainly help with longevity and mpg. Not saying it's the cause of you issue you may have, but it's certainly a start.
This is some parameters noticed in your vid others will be searching for at WOT...
CBL_Fuel_State - 47
_Engine_Speed - 1245
Total_Fueling - 267.97mg/stroke
CBR_Chi_Mode_Status - 0020
CBR_Chi_Table_Mask - 00000006
VGT_Actuator_Position - 43%