Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
Hello, my name is Bobby. Thank you for the question. The most common failure on this engine that will cause a noise like this is the timing chain. The guides wear out frequently and cause some serious noises. You need to pull the front cover and inspect it. You should be able to tell also if the noise is coming from the front of the engine. If it is then expect to replace the chain, guides and tensioners. If you need more help please let me know.