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Thread: Disco 1 1993 3.9 inj Running rough

  1. #1
    Join Date
    Oct 2020
    Location
    NZ
    Posts
    1

    Disco 1 1993 3.9 inj Running rough

    Hi I have a disco 1 1993 3.9I just the truck was running good small after leak from water pump replaced pump, thermostat and belts. All good on startup checked temp heater working checked for air locks all good. A few days later on a test drive rpm 1800 to 2500 in has a miss sometimes it feels like itís running on 2 cylinders in the rev range it pots at the exhaust just sitting there and holding the rpm. Itís weird how it was running fine replaced a water pump and now itís missing. Iím a little embarrassed to say what we have replaced, spark plugs ht leads cap rotor ignition module coil air mass meter fuel pump. When this all started I was convinced it was an earth fault Iíve checked the basics battery earth motor earth an auto electrical friend started a bit of a probe and found the temp sensor not working correctly making it run lean replaced sensor. Itís not a case of money I would like to find the fault I canít be the only person thatís had this fault. Most of the time you think itís fixed drive 20 30 km and all of a sudden it back. HELP HELP

  2. #2
    Join Date
    Feb 2013
    Location
    windsor
    Posts
    23

    what to check

    Quote Originally Posted by PBDisco1 View Post
    Hi I have a disco 1 1993 3.9I just the truck was running good small after leak from water pump replaced pump, thermostat and belts. All good on startup checked temp heater working checked for air locks all good. A few days later on a test drive rpm 1800 to 2500 in has a miss sometimes it feels like itís running on 2 cylinders in the rev range it pots at the exhaust just sitting there and holding the rpm. Itís weird how it was running fine replaced a water pump and now itís missing. Iím a little embarrassed to say what we have replaced, spark plugs ht leads cap rotor ignition module coil air mass meter fuel pump. When this all started I was convinced it was an earth fault Iíve checked the basics battery earth motor earth an auto electrical friend started a bit of a probe and found the temp sensor not working correctly making it run lean replaced sensor. Itís not a case of money I would like to find the fault I canít be the only person thatís had this fault. Most of the time you think itís fixed drive 20 30 km and all of a sudden it back. HELP HELP
    ARE YOU RUNNING THE ORIGINAL IGNITION AMPLIFIER ? IF SO YOU NEED TO CHANGE TO A BOSCH BIM 024 SEE BEAUTY UTEY INFO ON THIS SUBJECT . ALSO ANOTHER LET DOWN IS THE THE DIZZY WIRE INTERNAL IT CRACKS INSIDE AND GIVES YOU NIGHT MARES WITH THE EXACT SAME SYMPTONS GOOD LUCK I LOST ALL MY HAIR TRACKING DOWN THESE PROBLEMS OVER 2YEARS

  3. #3
    Join Date
    May 2008
    Location
    Adelaide
    Posts
    390
    May be throttle position sensor playing up.

  4. #4
    Join Date
    Feb 2020
    Location
    Perth. Western Australia
    Posts
    49
    From memory, around that area where temp sensor is, the harness also leads to the fuel injectors. sometimes working in that location can dislodge the wires. Might pay to check injector connections, clean etc.

    It does sound like not getting correct fuel if it's popping... ie. lean.

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