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Our local stations' (basically everywhere) diesel fuel has the minimum required cetane and is up to 20% biodiesel, ULSD. *My* truck runs fine on it. I'm not sure the documented long crank issues with some of these engines is fuel related, but fuel can certainly always be suspect. -
For the long cranking, I do know this engine is very susceptible to fuel quality. Watch your centene values and bio content. This isn't a Jimmy that will run off of crude. -
My 2000 silverado 5.3 4wheel drive keeps running the battery down. With using the Power Probe tester plugged into OBD port then battery neg disconnected im showing a draw of 130mA. It should be below 40mA. The drain goes away when I unplug the horn relay. The horn is disconnected. So with that test it is after the relay between it and the horn. Is there anything else on that circuit?
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Got a `25. Been looking on the history of 2 computers I use to find the TSB. Ain`t there. I did read it and it says oil pump prime. But, if a pump loses prime, it won`t pump. They can cavitate and make noise though. Can sound like marbles. Most won`t pull air on the suction side. That`s why you have to prime a new oil pump after a change or an engine rebuild. I was thinking out loud on my post. I was in the game for a long time. I take pride in troubleshooting. It`s a challenge. Course, I did state that I could be wrong.😉 I want people to think. Iv`e seen tsb`s and recalls not be correct. -
By GMCustomerService · Posted
We know how frustrating unexpected noise concerns can be in your vehicle. Our team would like the chance to connect and assist alongside your dealership for resolution options. Please visit https://s.gmc.com/support-request and fill out the form with more details about what you've experienced in your Sierra to get started. We will watch for your outreach.
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