I recently got ahold of a 96 eclipse GST for free.. after towing it to my house i got the engine started finally.. to discover it has this god awful knock.. Now call me dumb but i know nothing about imports so please someone help.. what should i replace to stop the knocking or how can i tell what the knocking is from? its really loud and sounds like a rod ....
Pull the wire or fuel on a cylinder-by-cylinder basis. If it get's quieter, that will tell you it's a rod and which one. It will require a rebuild or new short block. That's not really that expensive. Of course, I can't hear the sound so it could just be a bad lifter.
Slowly bring the revs up to about 1800 or so. If its a rod bearing, usually the knock will stop at some point when the loads equalize, and a blip on the gas will make it audible again. A rod bearing has a more solid sound than a bad lifter (like hitting an anvil with a hammer, vs tapping the rocker cover with a bolt).
Next, take the cam cover off and the plugs out, and check of there's any really loose tappets as you rotate the engine. A failed lifter will usually be obvious. A cam lobe could be damaged or worn away.
A loud knock might also be a cracked piston. Aside from the knock, does the engine fire on all four? Its possible that the cam belt has jumped a tooth, and a piston is hitting a valve or valves.
In all cases, you will have to identify the problem and rectify it. If its a lifter, the cam has to come off. All the others mean the engine has to come out for a strip and rebuild.
Stewart DIBBS
thnx guys ill start trying everything you all have suggested ill figure it out and get back to yall
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