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Daniel Wilson
Daniel Wilson,
Category: Medium and Heavy Trucks
Satisfied Customers: 1742
Experience:  Owner at DJ Wilson
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I rebuild this cummins isx 450 a while ago i chanmged all 6

Customer Question

hello sir i rebuild this cummins isx 450 a while ago i chanmged all 6 injectors what could other issue for low power CAC - OK turbo - OK turbo actuator driver - ok
Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Expert:  cumminsdr replied 1 year ago.

What is the engine serial number? Any fault codes present? How have you determined a low power issue?

Customer: replied 1 year ago.
esn is 79125882
no fault code
and the problem of low power is it pulls around 60,000 pounds and on uphill it comes from 105 kmph to almost 60-70 kmph speed and
Expert:  Derek Neustaeter replied 1 year ago.

What year is this cummins isx450? Is it equipped with an EGR system?

Customer: replied 1 year ago.
it has egr
Expert:  Derek Neustaeter replied 1 year ago.

Your problem is likely your EGR valve sticking open. Do you have a laptop with Cummins Insite available?

Customer: replied 1 year ago.
i have it
and its not the egr valve stuck open
Expert:  Andy replied 1 year ago.

Hi there ! My name is ***** ***** you still need help ?

Customer: replied 1 year ago.
sir i do
i can explain in brief what really happening
under no load or light load truck is running good
but under like 80,000-1,00,000 pounds
the truck dies on uphills doest go above 80 on uphill
the truck has cummins isx 450 and it has very slow differential that is 4.55 and 18 speed transmission and it goes to 105kmph at rpm of 17
Expert:  Andy replied 1 year ago.

ANy codes at all? An engine light on ?

Customer: replied 1 year ago.
No no light
Expert:  Andy replied 1 year ago.

No codes makes it very difficult to know exactly where the problem lies . I would connect with insite program if you can and see what codes are in there if any along with checking their time stamp to see exactly when those codes occurred . Some codes do not cause an engine lamp to come on but are still recorded in memory .

Expert:  Andy replied 1 year ago.

I will send a performance troubleshooting tree to help you figure this out.

Customer: replied 1 year ago.
ok please
and can u tell me at what rpm is the peak power or fuel supply/boost
Expert:  Andy replied 1 year ago.

https://www.dropbox.com/s/6nkur0v03ndwj13/cm870%20performance%20troubleshooter.pdf?dl=0

Expert:  Andy replied 1 year ago.

Hi there . Looking for an update on this . Any luck ?

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