Engine knock... please help!

01-08-2008, 03:09 AM
PLEASE HELP... dont want my baby to die!!!!!
J30... high miles. just started a serious knocking noise in the engine and has always been very reliable as far as engine performance. i did not put in the wrong gas and have filled up w/ premium for sure. it started a day or two after accidentally filling engine up w/ half a quart too much of oil (may be cause but wont stop).... but drained oil to proper level and still knocks badly. valves maybe? any help will be appreciated!

01-25-2008, 01:11 AM
because you say your engine has a lot of miles on it, it could be a rod. also theirs no telling how the previous owner treated it. possible reasons could be a rod, fuel injection problem, bad timing belt position, faulty cooling system, ect.. my advice is if the car means a lot to you then take it to a local shop, get a diagnosis from a certified technition. just to be on the safe side. but a knock in the engine will lead to serious problems down the road, if not taken care of soon.

hope this helps


01-25-2008, 11:53 AM
thank you! actually it was a rod... i had to swap out the engine and it kind of sucks b/c i swapped for a used engine and it does not perform quite as well as my other one did before the rod. i still have the broken engine and would like to eventually place it back in if i can fix the problem. can you fix an engine w/ this particular problem? i dont think it failed completely b/c the engine didn't seized.

thank you for your insight!

10-04-2008, 11:54 PM
how is the rod damaged?

09-14-2009, 08:52 AM
You can always check out 300zx.com and search for rods/bearings for you motor and rebuild it. They have pretty good prices and the guys there will be able to help you out with any technical questions.

09-15-2009, 04:01 AM
IF you know the engine is good then just change the rod and now that the engine is out it a good time to change the water plugs the oil pump the and the bearings. In others words do a complete over haul off the engine

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