troubleshooting problem

Discussion in 'Chevy Truck Forum' started by old red truck, Dec 10, 2017.

  1. old red truck

    old red truck New Member

    Joined:
    Dec 10, 2017
    Messages:
    3
    Likes Received:
    1
    Trophy Points:
    1
    Hello. I have a 1988 Chevy K2500, 5.7 Liter. The following problem came up suddenly. It Starts fine in the morning, drives fine, but if I shut it off for more than 15 min. and go to restart it, It runs terrible. Like it has no power and is running very lean. Check engine light comes on and the trouble code I get is a 44. Sometines it will clear up and run fine as I drive and sometimes it will continue to run bad. I replaced the O2 sensor and it did not help. The fuel pump is a after market item about 4 years old. Where do I start?
     
  2. JTWard

    JTWard Full Member

    Joined:
    Sep 3, 2012
    Messages:
    1,280
    Likes Received:
    969
    Trophy Points:
    113
    Gender:
    Male
    Occupation:
    I'm retired.
    Location:
    I live very close to the Delaware border with S.E.
    HI and Welcome. Right behind the thermostat is a 2 wire sensor, ( It's the temperature sensor the PCM uses to adjust the throttle bodies and signals the fuel injectors to work.) And it only cost $22.00
     
    MikeG and gmctrucks like this.
  3. old red truck

    old red truck New Member

    Joined:
    Dec 10, 2017
    Messages:
    3
    Likes Received:
    1
    Trophy Points:
    1
    Does the following sound correct for testing the temp. sensor on the truck. Check for 5 volts going to the sensor with key on. Also 1.5 to 2 ohms between the pins of the sensor with the engine cold . With a warm engine the ohm reading should drop.
     
  4. gmctrucks

    gmctrucks Full Member

    Joined:
    Nov 9, 2006
    Messages:
    9,240
    Likes Received:
    4,961
    Trophy Points:
    113
    Location:
    Houston,Texas
    Now that your in that area check the two ground wires that are attached to one of the stats bolts mine broke and I didn’t even know it good luck! GMC
     
    MikeG and JTWard like this.
  5. JTWard

    JTWard Full Member

    Joined:
    Sep 3, 2012
    Messages:
    1,280
    Likes Received:
    969
    Trophy Points:
    113
    Gender:
    Male
    Occupation:
    I'm retired.
    Location:
    I live very close to the Delaware border with S.E.
    Yes, but the 2 wire sensor in transmit signal to the PCM, Not really sure of the 1.5 volts but it sounds like it. Also on the drivers side of the engine has a sensor right above the #1 spark plug. It's for the temperature gauge and has a single wire going to it.
     
    MikeG and gmctrucks like this.
  6. mowfixer

    mowfixer Full Member

    Joined:
    Jun 20, 2011
    Messages:
    775
    Likes Received:
    1,472
    Trophy Points:
    93
    Gender:
    Male
    Occupation:
    Retired
    Location:
    Sanford, NC
    Click HERE and it might
     
  7. old red truck

    old red truck New Member

    Joined:
    Dec 10, 2017
    Messages:
    3
    Likes Received:
    1
    Trophy Points:
    1
    Turned out to be a faulty fuel injector. It would seem to stop working sometimes once the truck warmed up.Replaced the fuel injector and seems ok now.
     
    MikeG likes this.

Share This Page