Question about 1991 Nissan Pickup

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I have a 1991 Nissan pickup with 141,834 miles and whenever i first start the truck there is a clicking noise coming from the engine but it'll stop when the truck warms up a bit. It also doesn't seem to make the noise after I get the oil change. Do I have a weak oil pump or maybe a leak somewhere?

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  • junestrng Mar 11, 2011

    Thanks that is a great help I've gone to countless mechanics and they've told me a wide range of things that I even knew had absolutely nothing to do with my problem. This makes the problem nice and clear and will definitely help me in fixing it!!

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Hi, a clicking or tapping noise that gets louder when you start the engine is probably "tappet" or upper valvetrain noise caused by one of several things: low oil pressure, excessive valve lash, or worn or damaged parts.

First, check the engine dipstick to see if the oil level is low. If low, add oil to bring it back up to the full mark. Is the engine still noisy? Check your oil pressure. A low gauge reading (or oil warning light) would indicate a serious internal engine problem that is preventing normal oil pressure from reaching the upper valvetrain components. The cause might be a worn or damaged oil pump, a clogged oil pump pickup screen or a plugged up oil filter. Using too thick a viscosity of motor oil during cold weather can also slow down the flow of oil to the upper valvetrain, causing noise and wear.


So the problem is either as a result of low oil level or a worn or damaged oil pump/clogged oil pump, but since the noise has stop after changing the oil, then the noise was as a result of low oil level...

Posted on Mar 11, 2011

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