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There are several different possibilities. If it is coming from the engine compartment, I would take it to a mechanic as soon as possible. Check your oil, make sure it is clean and topped off. I work in an auto repair shop, and almost every vehicle that comes in with an engine knock has been driven with low oil, and severely damaged the engine. Most likely, you will need to overhaul or replace the engine. I would recommend replacement, there is almost always less problems that way. If you can afford it, I would go with a Jasper product. They are amazing. We install dozens of them every year, and we have never encountered a problem with them. They have fabulous warranties, and they live-run all their engines before shipping them out. You won't regret it. I put a Jasper engine in my 1973 GMC Jimmy, and it runs perfectly smooth, and full of power.
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