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Andy
Andy, Truck Diagnostic Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 1571
Experience:  International trucks, International, Maxxforce and Cummins engines, diagnostic, electrical, Hvac and refrigeration repairs
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I am working on 2004 kenworth t800 truck with cummins ism

Customer Question

hi i am working on 2004 kenworth t800 truck with cummins ism engine. ( vin# ***** and esn 35091571) truck have no power while driving down the road. no codes, no check engine lite. if i disconnect the egr valve truck runs fine. so i changed the egr
valve new. still same thing no power driving down the road and not much boost pressure. if i disconnect the egr valve truck runs fine, good boost pressure and power. no cac air leak , all battery connections are good and clean. all injectors are working good.
proform injector cutoff test. everything checks out good. what controls the egr valve? oh also it have new ecm as well.
Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Customer: replied 1 year ago.
just waiting for an answer?
Customer: replied 1 year ago.
still waiting?
Customer: replied 1 year ago.
seems like experts are too busy? i am paying extra for urgent! if u guys can not answer in few minuts then don't charge me plz.
Expert:  Andy replied 1 year ago.
Hi there MY name is Andy ! Sorry about the delay ! I just got on and noticed that you were not looked after yet . This almost sounds like a wiring issue. Perhaps the valve is being kept open when plugged in . This would definitely give you low power because you would lose exhaust back pressure needed to run the turbo when it needs it the most .
Expert:  Andy replied 1 year ago.
I will look for a troubleshooter for this but in the meantime , I would check the wiring harness for possible rubout , damage to it . Maybe even do a pin to pin test to make sure they are wires crossing inside the loom
Expert:  Andy replied 1 year ago.
Let me know if you need a hand testing the harness with pin to pin checks . We could use skype audio to work on this .

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