When this problem happened i took it to my local mechanic because my oil pressure alarm went off and i shut the motor off. My mechanic ran a oil pressure check and found nothing wrong with the oil pump, finally did a smoke check and found that there was a spun cam bearing. The mechanic called the local Chevy dealer to see if they could extend the warranty because i only had 73,000 miles at the time and to make a long story short they said what they would do was chevy would pay half and i would pay the other half, now here is what really made me MAD, my half of the deal was $6000 and chevy was going to pick up the other $6000 that meant to install a short block it was going to be 12,000 dollars. I guess you know what i told them. My mechanic found me a 2006 motor with 35,000 miles and life time warranty with a 1 year mechanic warranty for $3500 install well guess where that motor sits today.

I filled a complaint with GM which did no good and all i can say is that i have a very good mechanic. Not so sure that my next vehicle will be a chevy.

I purchased a 2004 Silverado 1500 with the 5.3l motor in the fall of 2004 with 12,000 miles on it. Within two weeks of making the purchase, the motor started knocking under moderate to heavy acceleration. I reported the problem to the dealer numerous times. They performed "top end carbon cleans", flashed the ECU, and replaced knock sensors several times and then started telling me it was "normal". I took the vehicle to three different dealers over a period of a year for the same problem. They almost always kept the vehicle for atleast one day claiming it was fixed and ready for pickup the next morning. On many instances, the motor knocked pulling out of the service shop. I contacted GM customer care who recorded the problem and assured me that the condition was normal. At this point, I finally gave up all attempts to have the motor repaired as my original warranty was running out. Approximately six months after the last trip to the dealer for engine noise, the number 1 cylinder threw a rod through the engine block. The truck had 49,000 miles on it at the time and had been meticulously maintained and pampered the entire time. Originally, the dealer quoted motor replacement at ~$10,000. After pulling up the vehicles history, GM customer service agreed to replace the motor at no charge and give me a 100,000 mile extended warranty. The shop did an excellent job, and I have 20,000 miles on the new motor with no more related issues, but the truck has been an absolute nightmare to own!