Question about 2004 Infiniti Q45
I don't think the news will be good. It sounds like a bearing is compromised on a connecting rod. I suppose it could be a main bearing as well so here is how to tell which. It the engine siezes completely, it is the main bearing. If you see a connecting rod come out you'll know it was that. A bad main bearing produces a very deep thunking noise and usually vibration. With main bearing failures, the metal bearing inserts will actually melt and weld themselves to the crankshaft then evrything comes to a quick halt.
There is one other option that has a pretty good chance of being the problem and that is that your timing chain has jumped a gear which is throwing off everything else. I would check this out first because it is repairable since I believe that engine is a non-interference engine meaning no valve damage. Put a timing light on it and you will be able to see if it is off a notch.
If all else fails and the rest of the car is still good, buy a crate motor. I bought a Target (not the dept store) engine, 5.0L (305cid) and it was much better than the original. Jasper makes them and there are a bunch more. Even junkyards have the 5.0L around all the time but the 350's are harder to find and go quickly.
Posted on Jun 25, 2009
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Posted on Jan 02, 2017
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