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  1. #1
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    Error Knock sensor 2 bank 2 high and 7 cylinder misfire

    Hello dear friends.. I have a problems with my v8 hummer h3.. Knock sensor 2 bank 2 high. i have changed sensor, cleared contacts on harness.. nothing.. it appears when rain or wet.. engine with with error not run normally... also i have 7 cylinder misfire.. i have changed spark plug, coil, wire - nothing helps... Now i plan to change injector.. pleas give any advice about my errors..



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  2. #2
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    So the knock sensor issue only comes up when it's damp out?

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    2008 H3 Alpha

    "Live free or die: Death is not the worst of evils." - General John Stark

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  3. #3
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    Quote Originally Posted by JPaul View Post
    So the knock sensor issue only comes up when it's damp out?

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    I am sorry.. whats mean "damp out" ?

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  4. #4
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    Damp sort of equals wet. Wet out. Raining, high humidity, and so on.

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  5. #5
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    Quote Originally Posted by JPaul View Post
    Damp sort of equals wet. Wet out. Raining, high humidity, and so on.

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    Yes.. often when wet... but sometimes in dry condition. i think these two errors are cause ich other...

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  6. #6
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    Finally i have beat these errors. 7 cylinder misfire was caused by injector #7 error. i have replace it and error gone. More complicated was error with knock sensor... i have checked all wires - they looks normal, but when i check them with tester they shows that they are shuted.. so i have cut wires from PCM to knock sensor and made my own wirea from pcm to knock sensor. Both errors are gone.. New one appears... p0420 catalyst efficiency low... bank 1.. bank 1 located on 7 cylinder side.. before i changed injector i never seen this p0420 error... Maybe this error have some connection with injector change ?

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  7. #7
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    Move the sensor from one side to the other, see if the problem comes again.
    06 H3, Birch White, Lux , Cooper AT3 35s, Borla Performance Cat-back, Bilsteins front w/ 1/2" extended stops, Hunner sleeve, Air Doc w/ K&N filter, Oem Roof lights, 55W HID Headlights and 35W Fog lights.

    09 H3 V8, LS376/480 Conversion, 3000 stall, Arctic Silver, 35s, XD Rockstar Wheels 17x8 Front 17x9 Rear, OEM Sliders, 40K External Trans Cooler, Bilstein 5160s front 5100 rear, O.D. Steering Bracket, Daystar 1" Body Lift, Borla Performance Cat-Back, custom intake pipe & K&N filter, Custom PCM tune, Pioneer DVD unit, Aurora 40" LED Light Bar, 50 W HID Headlights

  8. #8
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    Quote Originally Posted by amrg View Post
    Move the sensor from one side to the other, see if the problem comes again.
    Done it.. i have moved sensor as you said.. before do it Problem appear often. after do it problem appears much more rarely.. but on same side. (7 cylinder side) what it means ?

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  9. #9
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    It means the sensor isnt bad, next step is to check for exhaust leaks on that side or a bad cat. If you have a scan tool, you can also check the temp on each side and see if there is a big difference, and check the fuel trims on each side.
    A clogged catalytic converter will get very hot so the temps will be way higher. If you have an exhaust leak, the truck will add or subtract fuel more on that side than the other (assuming your injectors are fine/ coils and so are the spark plugs)
    06 H3, Birch White, Lux , Cooper AT3 35s, Borla Performance Cat-back, Bilsteins front w/ 1/2" extended stops, Hunner sleeve, Air Doc w/ K&N filter, Oem Roof lights, 55W HID Headlights and 35W Fog lights.

    09 H3 V8, LS376/480 Conversion, 3000 stall, Arctic Silver, 35s, XD Rockstar Wheels 17x8 Front 17x9 Rear, OEM Sliders, 40K External Trans Cooler, Bilstein 5160s front 5100 rear, O.D. Steering Bracket, Daystar 1" Body Lift, Borla Performance Cat-Back, custom intake pipe & K&N filter, Custom PCM tune, Pioneer DVD unit, Aurora 40" LED Light Bar, 50 W HID Headlights

  10. #10
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    Quote Originally Posted by amrg View Post
    It means the sensor isnt bad, next step is to check for exhaust leaks on that side or a bad cat. If you have a scan tool, you can also check the temp on each side and see if there is a big difference, and check the fuel trims on each side.
    A clogged catalytic converter will get very hot so the temps will be way higher. If you have an exhaust leak, the truck will add or subtract fuel more on that side than the other (assuming your injectors are fine/ coils and so are the spark plugs)
    I have tech2. can you teach me how to get these readings...

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  11. #11
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    Im using torque pro app to get them on my fone... they should be listed as
    For fueling : LTFT1 ,LTFT2
    Temps: CAT B1S1 , CAT B2S1
    06 H3, Birch White, Lux , Cooper AT3 35s, Borla Performance Cat-back, Bilsteins front w/ 1/2" extended stops, Hunner sleeve, Air Doc w/ K&N filter, Oem Roof lights, 55W HID Headlights and 35W Fog lights.

    09 H3 V8, LS376/480 Conversion, 3000 stall, Arctic Silver, 35s, XD Rockstar Wheels 17x8 Front 17x9 Rear, OEM Sliders, 40K External Trans Cooler, Bilstein 5160s front 5100 rear, O.D. Steering Bracket, Daystar 1" Body Lift, Borla Performance Cat-Back, custom intake pipe & K&N filter, Custom PCM tune, Pioneer DVD unit, Aurora 40" LED Light Bar, 50 W HID Headlights

  12. #12
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    Quote Originally Posted by amrg View Post
    Im using torque pro app to get them on my fone... they should be listed as
    For fueling : LTFT1 ,LTFT2
    Temps: CAT B1S1 , CAT B2S1
    thank you.. i will try..

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