Question about 2004 Infiniti Q45

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Hearing knocking sound when engine heats up in my infinitiQ45 2002 model

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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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1989 -1990 350 big bear it has a knocking when starting but after a few mins it warms up doesn't seem to knock as how can I fix this


Depends where the knocking is coming from, what sort of knock, how loud it is, what speed and whether it is load and speed dependent.

It is important to have a rough idea of the location or source of the knock in order to decide whether to dismantle or not and if dismantling what to begin checking. Even if you had the patience to make the sound heard with words it would be no substitute for an experienced person hearing it.
Also different people describe noises differently and hear them differently.

Aluminium is a common material used in such engines and it expands about seven times more than steel as it heats up and this is the principle reason why cold engine knocks can fade after warm-up and why some cold engines are silent and are noisier when hot.

Listening through a stethoscope or a large screwdriver is an aid to locating the area of the knock. A load dependent knocking indicates piston or connecting rod problems and if the noise becomes louder and more harsh on load or as the speed increases it signals trouble sooner rather than later

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what make and model engine size , when does the sound appear , is it when stationary but happens when the engine is revd up , at what road speed does it come in, is it a grinding , rumbling, scraping , knock, rattle as weird means nothing

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2000 Estima, 6 cylinder, makes a short whining noise on start up, also when placed into gear both forward and reverse - mainly when cold - makes a slight knocking sound that fades when you pick up speed,...


The whining noise at start up is either the power steering pump (possibly low fluid, or faulty pump bearing), or possibly a belt on the engine. As for the knocking sound, that is hard to diagnose without actually hearing it, but based on the fact that you are hearing a whining sound at start up, which is indicative of a loose belt, I would start at the belt tensioner and make sure that it is applying the correct amount of pressure on the belts. If the belt tensioner is faulty, it can make a knocking sound. If that is not the issue, then it could simply be the lifters. With engine run time/miles on the engine, internal engine components, such as lifters, valves, bearings and any moving part, deteriorate from friction wear and heat.They have a tendency to make a knocking/rattling sound when they are building up pressure. When they build sufficient pressure, or the engine reaches operating temperature, this sound/noise will dissipate and become nonexistent. This can be remedied by changing the oil, and possibly the weight of the oil (5w30, 10w40, 20w50) depending on your driving habits , or conditions (Highway v/s City/Stop&Go, or short trips under 30 miles)

I hope that you have found this information to be useful, and if I can be of any further assistance, please let me know. Thank you for using fixya!

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sounds to me the heater box needs replacing. could be because of a leaking heater core. are you havings to add coolant? wet floor mats on pass side? the knocking you are hearing is more than likely the blower fan hitting on the plastic molding because of a faulty bearing in its driveshaft.

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Knocking sound


Knocking sound is bad and most likely time for a new engine. The knocking noise your are hearing is the pistons knocking against the engine block when it goes up and down.

Inspect the level of your engine oil to make sure you have enough oil in there.

Thank you for using fixya and good luck

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