Question about 1996 Nissan Pickup

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Loud Engine Knocking

My brother in law rolled it on its top. Now when you start it it sounds fine at an Idle but when you add rpms it starts knocking loudly. The more rpms the louder it knocks.
Any ideas what this might be?

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Sounds like you may have some sloppy piston and piston cam slap.

Option One -
Drain 2 quarts of oil and try adding the drained amount as a 40-50 weight oil in the engine to test. Nothing will be hurt on a older engine.

Option 2
use a funnel or a mechanical listening tool and put it against the engine.
You can use a solid stick 2-4 feet long so your not too close to the engine and the other end against your ear, while listening. It is like listening to a heart beat and the closer you get to the sound the closer you are to pinpointing where it is.

My guess is you will hear it at a lower part of the engine.

If the noise is coming from the Valve covers, then you will need a valve job and there is lots more to it. The 1996 is an easy engine to work on.


Posted on Mar 02, 2009

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You need to do your timing before you damge your engine.

Posted on Mar 02, 2009

  • Ginko
    Ginko Mar 02, 2009

    If the engine is consuming oil and making smoke, then it ican be a bad ring, or a piston tapping on the head.
    If the knock is more of a clicking noise it can be a faulty valve.
    If the noise is from engine missing, then check timing.

    replace the oil, if the engine has many miles try using thicker oil,
    this can be a minor fault, like a broken lifter, but I suggest having the engine checked by a mechanic before risking to damage the engine.



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