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Posted on Jan 02, 2017
I see that you had the injectors replaced 20,000 miles ago. I would still check the oil to make sure it is not overfull. The new injectors could be bad. If the oil level is not overfull then get a paper towel and touch the dip stick tip on the paper towel while oil is on the dip stick. If it's only oil it will not spread. If it has diesel in the oil the oil with spread. If this test doesn't show the injectors to be bad then you have three other possibilities. The FICM (fuel injection control module), the fuel pressure regulator, or the injection pump. It's hard to pinpoint what the problem is without running more tests and the only way to run those tests is with the computer the dealership has. Just so you know your injectors are still under warranty until 100,000 miles. Most likely you will have to take it to the dealership to get you truck fixed. I hope this helps you some.
Posted on Jan 05, 2009
It sounds like your Idler pully bearing or your tensioner bearing. Regardless change them both and the surpentine belt too. The sound is letting you know that the bearinf is bad and will fail soon. Good luck
Posted on Apr 06, 2009
SOURCE: Knocking-Tapping noise
hi, is this tapping loud, they are normally clattery, especialy if fitted with a lucas or cav fuel pump.
an injector has lots of smoke and thumps in most cases.
get back to me
Posted on Aug 18, 2009
turn the key on and wait for the security light to go off about 10 to 15 minutes then turn key off and back on an try starting it. this usualy clears the pass key II system
Posted on Oct 15, 2009
Its called the fuel pump cylinoide which is attached to the fuel pump. Unless the fuel pump is bad, you got an expensive part to buy around $2500 or the cylinoide is $900 whichever is broken. This is a know issue for GMC deisel suburbans 6.5.
Posted on May 23, 2010
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