I've got a 96 GMC 2500HD with a 7.4L.(210,000 miles and counting) I recently developed a noise in the motor I can't figure out. It's sort of a deep chirping sound that changes with the engine speed. I've unhooked the Torque converter and Serpentine belt but the noise remained! I put rocker studs in so I could adjust the rockers. No help! Then I tried a new oil pump, (Pressure was good but I wasn't getting much oil to the rockers!) After the truck sat for two days waiting for parts. I put the pump in. It was quiet for a minute or two then the noise came back. I've had a dozen ideas on what it could be. But If I spend more money on Ideas I'll have to listen to my wifes grumbling. (Not that I blame her. I wasn't pleased with the outcome either!) So Any ideas would be greatly appreciated!
- posted
18 years ago