Question about 1994 Nissan Pathfinder

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My 94 pathfinder has been idling roughly lately. The check engine light is on and im getting a code 51 witch is something to do with the injector cicuit. I changed the spark plugs, but that didnt change anything. It still idles the same. If i change the fuel filter it seems to do better for a short time but always goes back to idling erraticly. How can i clear the check engine code (inspection comming up soon lol). the car runs fine while on the road. i bet its a bad injector just dont want to replace them all, its kindof expensive.

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  • Neil R.
    Neil R. Jan 12, 2013

    I can also smell gas, cant find any leaks.

  • Neil R.
    Neil R. Jan 24, 2013

    I wound up changing all the injectors, now the thing runs like new!

  • Neil R.
    Neil R. Jan 24, 2013

    the gas smell was from a lose hose on the fuel rail.

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Posted on Jan 02, 2017

  • 4 Answers

SOURCE: 1997 Nissan Hardbody has rough idle/surges/stalls

the 2001 altima is what i have and I had the same problem as you. turned out to be a bad head gasket factory used cheap ones for a few years before they found the problem. one way to test this is to get a can of carborator cleaner and spray it around the area where the head meets the block under the intake problem should be around the 4th cylinder or close to driver side. if the head gasket is bad the rough idle will smooth out while you are spraying the head.

Posted on Aug 06, 2009

thunderalley
  • 432 Answers

SOURCE: 1994 Nissan Altima GXE Engine miss

check your EGR and for vacuum leaks

Posted on Oct 03, 2009

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