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I have a 98 Nissan Frontier with the 2.4 l and the 5 speed transmission. I was driving and went over train tracks, which is part of my daily commute, and out of nowhere, there is a knocking noise coming from near the transmission everytime I accelerate, and the engine is on the verge of dying. I was able to get it home very slowly, since I was only about 5 mins away. Could this be as simple as a bad engine or transmission mount, considering the engine was shaking badly, along with the whole car, and would that cause the engine to run very poor, or is it a serious tranny issue, like a clutch or pressure plate. The knock only happens when the engine is revvved a bit, and does not knock at idle or from the engine. Any suggestions are appreciated. Thanks all
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There could be a lot of things causing this. I would try putting the rear up on jackstands and have a helper drive the truck while looking to see what is going on. Since it happened after a bump, I would check things like leaf springs, u joints, the center carrier bearing and as ou mentioned the engine and transmission mounts.
FYI, you can access the FSMs for the frontier here: https://www.nicoclub.com/nissan-service-manuals
They have sections in most sections on troubleshooting vibrations, etc.
Good luck, let us know what you find.
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