Question about 1995 Nissan Pathfinder

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Knocking/pinging sound when stepping on the gas for power.

My 1995 Nissan Pathfinder makes a knocking/metalic sound when stepping on the gas for power and the sound gets more rapid as you accelerate. It recently failed the smog test under the timing part of the test because the timing was set too high so I had it adjusted at a local shop. The service tech only adjusted the distributor fas far as he could to lower the idle. He didn't adjust the timing because he wasn't sure how the degrees were represented by 3 marks instead of 4 marks By the time I got it home it was making this knocking/pinging sound.
Do you know what could be causing this knocking/metalic sound?
Is the knocking/metalic sound related to his adjustment?
Also, is the car safe to drive in this condition?

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You will distroy the engine if you continue to let this noise happen.
the timing must be retarded to get the ping out if its that bad.
most of the time if its just a little bit though filling the tank with super unleaded will take out the noise.
the distributer must be loosend and turned in the correct way to ****** the timing and the idle must be put back up to compensate.
the distributer is the ignition timing.
the other thing that could have happend is the timing may have jumped time on the timing belt itself.this is a complely different timing.
this timing is valve timing.
the distributer is ignition timing.
when the distributer is turned you are changing the ignition timing .
you say in your text and i quote .

The service tech only adjusted the distributor fas far as he could to lower the idle.

a tech should never be turning the distributer to lower the idle nor should this be explained in any way to the customer.

if a tech says he dosent understand something stop them rightaway and get your car out of there or get someone else to talk to .
10 times out of 10 if the tech dosnet get it the car wont get it either.
have a competent service tech test and conferm the timing belt or chain timing .

keep me posted
joelmitchell1@hotmail.com

thank you
jm

Posted on Jul 29, 2009

  • joel mitchell
    joel mitchell May 05, 2010

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Both of the above comments were right except the part of running the high octane fuel...just have the timing reset and have a complaint made on the tech who moved the distributor. Since the vehicle was driven, I would have the timing belt checked too.

Posted on Aug 07, 2009

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Pathfinder is equipped with knock sensor on both side of block .what it does is it detect knock and ****** engine timing,if sensor is faulty it will produce knocking sound.

Posted on Aug 23, 2009

  • Charles Huckeba
    Charles Huckeba Mar 23, 2011

    The knock sensor WILL NOT make a knocking sound if it is faulty.

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This is possible!! If the timing is offset, the engine may encounter knocks due to improper firing, fuel mixture. I recommend that the timing belt be replaced or if replaced recently-retimed properly. This motor is a NON-interference motor, and major engine damage can occur if the belt runs or becomes even more offset. hopefully this helps

Posted on Jul 29, 2009

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