CM870 power issues
11-21-2022, (Subject: CM870 power issues ) 
Post: #1
CM870 power issues
Is this fuel actuators or something else? Truck takes off and pulls sluggish and harder to shift gears after 2 days driving then clears up over the weekend after sitting two days. Almost seems like a boost leak but problem consistently clears up after sitting. It’s a head scratcher.
replyreply
11-21-2022, (Subject: CM870 power issues ) 
Post: #2
RE: CM870 power issues
see if it will pass an injector leak test after when it is acting up...
ref: http://rawze.com/forums/showthread.php?t...8#pid67948

also, what is the boost doing when this is happening?..

and also.. does it have a delete program in it?.. If so then you need to have the program checked out right away to ensure it is not harmful or causing it to jump engine operating modes improperly. - 90%+ of all delete programs are very harmful to the engine, even if the power was not touched.


User's Signature: ->: What I post is just my own thoughts and Opinions! --- I AM Full Of S__T!.
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 Thanks given by: Zocaid
11-21-2022, (Subject: CM870 power issues ) 
Post: #3
RE: CM870 power issues
Appreciate it Rawze,

Truck is not deleted, and boost doesn’t change when the issue starts. It feels more like the engine is choked up starting even from takeoff. Truck shakes when I left off the clutch like I’m in way to high of a gear. Starts out slow and don’t gain much ground from 3-7 gears and when I let off the gas the engine pulls me back almost as if the Jake’s are on but they aren’t. But on a day like today it ran smooth as butter and has great acceleration between gears
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11-21-2022, (Subject: CM870 power issues ) 
Post: #4
RE: CM870 power issues
(11-21-2022 )Rawze Wrote:  see if it will pass an injector leak test after when it is acting up...
ref: http://rawze.com/forums/showthread.php?t...8#pid67948

also, what is the boost doing when this is happening?..

and also.. does it have a delete program in it?.. If so then you need to have the program checked out right away to ensure it is not harmful or causing it to jump engine operating modes improperly. - 90%+ of all delete programs are very harmful to the engine, even if the power was not touched.

And I forgot to add. I have 26k on a long block from Cummins. I had the same issues with the last motor.
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11-21-2022, (Subject: CM870 power issues ) 
Post: #5
RE: CM870 power issues
Do you have insite? If so ill be happy to help you figure it out one evening.
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 Thanks given by: Rawze
11-22-2022, (Subject: CM870 power issues ) 
Post: #6
RE: CM870 power issues
I had a CM570 that would have very random low power problems, It was a bad barometric pressure sensor. There were no fault codes but I found it by reading the sensor value with Insite, at my location should be around 31inhg but was reading 6 ingh.... Just a suggestion
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 Thanks given by: Rawze , Waterloo




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