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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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1999 ih 4700 dt466 heui injectors truck is knocking loud

Customer Question

1999 ih 4700 dt466 heui injectors truck is knocking loud when increasing throttle white? gray heavy smoke . am looking to purchase this tomorrow, want to know potential causes of this issue .
Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Expert:  Andy replied 1 year ago.

Hi there ! My name is Andy ! From what you are describing , this sounds like a bad injector . They do that when there is a cracked tip on the injector .

Expert:  Andy replied 1 year ago.

If you have the master diagnostics software , you could use it to connect to the engine a perform a cylinder contribution test to determine which one is faulty. Or perhaps just start it up cold and immediately measure each port on the exhaust manifold with a temp gun to see which one is not following in temperature increase along with the others . One will tend to stay colder than the others.

Expert:  Andy replied 1 year ago.

Hope this helps you ! Please do not forget to rate my service to you at the end . Feedback is important and bonus is appreciated . Thank you .

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