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Thread: 99 tahoe- 3 codes (and a fluttering gas needle)

  1. #1

    99 tahoe- 3 codes (and a fluttering gas needle)

    hi i know this isn't a racing question but maybe somebody can help. i have a 99 2dr 4x4 tahoe and have 3 codes coming up. it was reading just 2 and i must have fixed 1? the codes are po138,140,and 340. the one i fixed was po102. i replaced the camshaft sensor but still getting the misfire occasionally along with the same code. is the 340 code causing the o2 sensor to read something wrong? i replaced a cam sensor in my 02 s10 and had the same miss, then changed the dist. and that fixed it. do i need to change the one in my tahoe as well, or just remove it and put it back in?

    also my fuel gage stays on full but it flutters the whole time. is this a sign of needing to change the sending unit or is there an easy fix i dont no about. anybody no how to help me? or should i just wait for obama to buy me a new 09 tahoe and just say hell with 99(lol)

  2. #2
    i have a 01 2500 hd and the gas guage is doing the same thing. The dealerships service dept says it is a sensor on the sending unit. They quoted me 600 to fix it but i found the sensor is only 150 . Id check connections first.

  3. #3
    is the sensor in the tank or on the outside?

  4. #4
    Senior Member RACING JUNKIE
    Join Date
    Sep 2007
    orland pk il
    inside the tank with fuel pump. if fuel pump has more than 60 k miles change the whole unit . pump is at about at the end of its life. it is serviced as a unit first check wiring for damage .

  5. #5
    thanks for the help. does anybody have any advice on the cam sensor problem? i am thinking i can just pull the dist and put it back in again since i changed the sensor already. would this work or do i need a new dist alltogether?

  6. #6
    Join Date
    Sep 2005
    Birmingham Al.
    Go into cam retard with a scan tool and set the dist + or - 2 degrees

  7. #7
    thanks passmore. ill try that

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