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Eric, Automotive Repair Shop Manager
Category: GMC
Satisfied Customers: 31901
Experience:  20+ yrs. experience as repair shop manager and technician.
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I have a 2001 gmc 3500 duramax I stopped at the bank came

Customer Question

Hi I have a 2001 gmc 3500 duramax I stopped at the bank came out and started the truck now it is knocking
JA: Where exactly do you think the noise is coming from? And how long has this been going on?
Customer: Just started from the top end drivers side
JA: Are you fixing your 3500 yourself? What have you tried so far?
Customer: Yes I put injector cleaner in the tank it help a little
JA: Anything else you want the mechanic to know before I connect you?
Customer: The person I got the truck from put eight used new injectors and pump in in july
Submitted: 6 months ago.
Category: GMC
Expert:  Eric replied 6 months ago.


Is it a deep knocking noise or more like a valvetrain tapping?

Is the check engine light on?

Any smoke while idling or on acceleration and if so, what color is the smoke?

Any fuel in the oil when you check the dipstick?

Customer: replied 6 months ago.
light on number two cylinder miss firing
Expert:  Eric replied 6 months ago.


Any smoke on acceleration?

Is it a deep knock or more a tapping sound?

does it change in sound when accelerating?

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