A knocking in the engine when car is idle?

Question:
I have a 93 Nissan Maxima and when sitting at a red light or just idle, there is a loud knocking...its coming from the engine. What is that?

Answers:

I have a 1997 ford escort it has a electric fan in the engine but when the engine is running it does not turn?

Wow, those were some crap answers... Don't buy any additives, don't buy any oil treatments and don't buy any injector cleaner - Your car is too old and tired for all that.

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If it goes away under acceleration (under load), you're most likely hearing rod knock, which means you have some serious internal problems in the bottom end.

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You have 2 choices at this point: Drive it until it dies (which can be tomorrow or many miles down the road), or rebuild / swap now.

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Your car, fortunately, is easy to find parts for, and here's a bunch of help - http://www.MaximaClub.org .

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You MAY even find that someone on the above link that is local to you and would do the swap for you for less than the dealer will charge.

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Low Oil

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Check the oil. It is low or was low and your engine is damaged. Next oil change add some lucas oil treatment it may help.

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you need to put in a duralube.. older engines need it for protection and it makes it run quieter cause it lubes things really well.. add it to your oil compartment on your next oil change

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the knocking is because somebody wants out.....or it could be a number of problems with your fuel or ignition

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It could just be trash in the engine block. The first thing to do is to go to an auto store and run fuel injector cleaner through the car. All you do is buy it and put it in the gas tank. If that doesnt solve the problem after a day or so take it straight to an automotive technician because it could end up cracking a cylinder which could result in a new engine.

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It may be many things. Oil, Rod and also, it may be a Water Pump or something. IF, you use good safely you can raise the hood and listen. Take a piece of pipe or very long screw driver and put it against different areas and listen to the other end, believe me you will hear it. Just be careful around the moving parts and belt. IF, it a rod, you can remove the oil fill cap and just listen to the hole, if, you can get your ear down there, you will know, it be louder. Just be careful and watch your hair and clothes. Have someone to turn the car off if you start screeming. LOL!

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I sort of fall in line with nissanTe have you ever heard so many totally stupid answers.first thing you have to figger out is.....is the noise generated from the driver thats the engine ..or from the driven..belts ,idlers,water pump, smog pump..sorry to say your not smart enough to figger it out so take to a repair shop and they will tell you what your problem is.this is not an answer somebody can give over the internet
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