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Thread: 05 silverado 2500 no spark

  1. #1
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    05 silverado 2500 no spark

    I need some 6.0 LS truck help!!! I got the new motor put in and I don't have spark. my data log shows that I have a crank signal and the camshaft signal what am I missing?

  2. #2
    Tuning Addict 5FDP's Avatar
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    Double check all grounds, even the ones on the back of the cylinder heads.

    Make sure all IGN fuses are good too.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.

  3. #3
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    Ok the power to the coil is good the trigger signal is good the. The ground from the pcm is good. But the chassis ground is there when the key is off but not when the key is on.

  4. #4
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    Quote Originally Posted by bigjoebull View Post
    Ok the power to the coil is good the trigger signal is good the. The ground from the pcm is good. But the chassis ground is there when the key is off but not when the key is on.
    Sounds like a big volt drop if I read and interpretted that correctly... Sounds like a ground wire wasn't fully tightened or tightened down over paint or just not installed. Does the 05 have the ground from the driver's rear of head to body. That's the one I would ofter forget to tighten back down. OR did it have the ones going to the back of the passengers head? Can't remeber for the life of me... Anyway do a voltage drop test and see if your losing your grounds or not. You can always run a jumper cable from battery to engine and body to elliminate or pinpoint a lack of ground.
    2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
    2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80

    ~Greg Huggins~
    Remote Tuning Available at gh[email protected]
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  5. #5
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    The ground to the fire wall, the 2 in the harness and the one to the battery are on a fresh machined block.

  6. #6
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    Bolts threaded all the way in and super tight? What happens when you try the jumper cables from battery ground to engine and body. Just cause their there and tight, doesn't mean the cables aren't bad. 1 ohm of resistance is all it takes on a main cable to cause issues.
    2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
    2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80

    ~Greg Huggins~
    Remote Tuning Available at gh[email protected]
    Mobile Tuning Available for North Georgia and WNC

  7. #7
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    I will try the jumper cables next. I triple checked the grounds. Thanks for the help. I also had some suggest the ignition module in the steering colum?

  8. #8
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    Quote Originally Posted by bigjoebull View Post
    I will try the jumper cables next. I triple checked the grounds. Thanks for the help. I also had some suggest the ignition module in the steering colum?
    I thought you said you had pulsed referrences while cranking at the coil, just no ground? Put a test light on the coil wire and see if you have pulsed spark coming from the coil. Could be something as simple as the center contact fell out of the distributor cap durring install. Wouldn't be the first time I've seen that.
    2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
    2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80

    ~Greg Huggins~
    Remote Tuning Available at gh[email protected]
    Mobile Tuning Available for North Georgia and WNC

  9. #9
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    This is coil per cylinder (8). each coil Has 4 wires. Constant power, trigger power, computer ground, and main ground. When the key gets turned on I loose the main ground.

  10. #10
    Tuner Howes's Avatar
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    so g102 is your coil ground. it is in the harness down low on the driver's side of the block. looks like a smaller wire terminal under the neg batt cable at the bloĉk.

  11. #11
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    Yes it uses the bolt that part of the power steering pump bolts to the block with

  12. #12
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    Again, I aparently misunderstood the chassi and setup. Won't happen again. Sorry. All 8 coils go to G102 Ground... Cable from battery goes straight to G102... This ground apears to only be for coils and ignition module along with the main cable hook up... G102 is the main ground from battery... There should be two grounds grounding here... The one for ignition system and main... It's located right around the middle of the block just below the spark plugs driver's side under the exhaust manifold... Might want to make sure you hooked up the ignition system ground there.
    2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
    2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80

    ~Greg Huggins~
    Remote Tuning Available at gh[email protected]
    Mobile Tuning Available for North Georgia and WNC

  13. #13
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    Sorry, post were made while I was aparently typing...
    2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
    2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80

    ~Greg Huggins~
    Remote Tuning Available at gh[email protected]
    Mobile Tuning Available for North Georgia and WNC

  14. #14
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    Location shown...
    Attached Images Attached Images
    2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
    2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80

    ~Greg Huggins~
    Remote Tuning Available at gh[email protected]
    Mobile Tuning Available for North Georgia and WNC

  15. #15
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    Few more if it helps... Not sure if I can get in trouble for this or not, but here they are.
    Attached Images Attached Images
    2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
    2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80

    ~Greg Huggins~
    Remote Tuning Available at gh[email protected]
    Mobile Tuning Available for North Georgia and WNC

  16. #16
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    Quote Originally Posted by GHuggins View Post
    Location shown...
    I think that's it!!! I only have one ground there. I will look for the second one.

  17. #17
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    Next stupid question... Main coil connectors are fully seated and when you installed the coils back on the motor, the wires underneath weren't pinched? Here's your basic flow chart. Top "go to's" are (YES's), Bottom "go to's" under each test are (NO's)

    Electronic Ignition System Diagnosis
    Circuit DescriptionThe electronic ignition system uses an individual ignition coil for each cylinder. The powertrain control module (PCM) controls the ignition operation through eight individual ignition control (IC) circuits. Each bank of four ignition coils is connected to the PCM, power, or ground by the following circuits:

    •Low reference
    •Chassis ground
    •Ignition 1 voltage
    •The appropriate IC circuit
    The PCM triggers an ignition coil by grounding the appropriate IC circuit using information from the crankshaft position (CKP) and camshaft position (CMP) sensors.

    Diagnostic AidsImportant: A missing CMP sensor signal may cause a long crank condition.

    The CKP signal must be available for the engine to start. The CMP signal is not needed to start and operate the engine. The PCM can determine when a cylinder is on either the firing or exhaust stroke by the 24X signal.

    Remove any debris from the PCM connector surfaces before servicing the PCM. Inspect the PCM connector gaskets when diagnosing or replacing the PCM. Ensure that the gaskets are installed correctly. The gaskets prevent water intrusion into the PCM.

    For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections.

    Test DescriptionThe numbers below refer to the step numbers on the diagnostic table.

    5.Monitoring the misfire current counters determines if a fault is present.
    12.A good indication that the fuse is open is all off the misfire current counters are incrementing on one side of the engine. Inspect the ignition positive voltage circuit for a grounded circuit. If the fuse is open and the ignition coil circuits are OK, inspect the injector circuits for being grounded.
    17.The crankshaft position and the camshaft position sensors 12 V reference circuits are connected inside the PCM.
    Electronic Ignition System Diagnosis Step
    Action
    Value(s)
    Yes
    No

    Schematic Reference: Engine Controls Schematics

    Connector End View Reference: Engine Controls Connector End Views or Powertrain Control Module Connector End Views

    1
    Did you perform the Diagnostic System Check – Vehicle?

    Go to Step 2
    Go to Diagnostic System Check - Vehicle

    2
    Attempt to start the engine.

    Does the engine start and run?

    Go to Step 5
    Go to Step 3

    3
     1. Observe the Engine Speed parameter with a scan tool.
     2. Crank the engine.
    Does the scan tool indicate RPM is present?

    Go to Step 7
    Go to Step 4

    4
    Is DTC P0335, P0336, or P0351–P0358 also set?

    Go to Diagnostic Trouble Code (DTC) List - Vehicle
    Go to Step 16

    5
     1. Idle the engine.
     2. Observe the misfire current counters on the scan tool.
    Does the scan tool display any misfire current counters incrementing?

    Go to Step 6
    Go to Diagnostic Aids

    6
    Do the misfire current counters increment for most cylinders on one bank of the engine?

    Go to Step 12
    Go to Step 7

    7
     1. Inspect the spark plug wire for open circuits, cracks, or improper seating of terminals at the spark plug or coil before proceeding with test. Refer to Spark Plug Wire Inspection.
     2. Inspect for spark at the plug with the J 26792 Spark Tester or equivalent while cranking. A few sparks, then nothing is considered no spark.
    Is adequate spark present?

    Go to Step 35
    Go to Step 8

    8
    Measure the spark plug wire resistance. Refer to Spark Plug Wire Inspection.

    Is the resistance more than the specified value?
    1,000 Ω/ft
    Go to Step 34
    Go to Step 9

    9
     1. Turn OFF the ignition.
     2. Disconnect the inoperative ignition coil.
     3. Turn ON the ignition, with the engine OFF.
     4. Probe the ignition 1 voltage circuit of the ignition coil with a test lamp connected to a good ground. Refer to Probing Electrical Connectors.
    Does the test lamp illuminate?

    Go to Step 10
    Go to Step 13

    10
    Probe the ignition 1 voltage circuit at the ignition coil with a test lamp connected to the ground circuit of the ignition coil. Refer to Probing Electrical Connectors.

    Does the test lamp illuminate?

    Go to Step 11
    Go to Step 14

    11
    Probe the ignition 1 voltage circuit at the ignition coil with a test lamp connected to the low reference circuit of the ignition coil. Refer to Probing Electrical Connectors.

    Does the test lamp illuminate?

    Go to Step 21
    Go to Step 15

    12
    Inspect for an open INJ 1 or INJ 2 fuse.

    Is the fuse open?

    Go to Step 30
    Go to Step 24

    13
     1. Disconnect the main ignition coil 8-way connector.
     2. Probe the ignition 1 voltage circuit at the ignition coil main 8-way connector using the test lamp connected to battery ground. Refer to Probing Electrical Connectors.
    Does the test lamp illuminate?

    Go to Step 25
    Go to Step 24

    14
     1. Disconnect the main ignition coil 8-way connector.
     2. Probe the ignition 1 voltage circuit on the harness side with a test lamp connected to the ground circuit of the ignition coil. Refer to Probing Electrical Connectors.
    Does the test lamp illuminate?

    Go to Step 19
    Go to Step  27

    15
     1. Disconnect the main ignition coil 8-way connector.
     2. Probe the ignition 1 voltage circuit on the harness side with a test lamp connected to the low reference circuit of the ignition coil. Refer to Probing Electrical Connectors.
    Does the test lamp illuminate?

    Go to Step 20
    Go to Step 29

    16
     1. Turn OFF the ignition.
     2. Disconnect the crankshaft position (CKP) sensor.
     3. Turn ON the ignition, with the engine OFF.
     4. Measure the voltage from the CKP sensor 12-volt reference circuit and a good ground with the DMM.
     5. Compare the measured voltage with the system voltage.
    Is the difference in the voltage more than the specified value?
    0.5 V
    Go to Step 17
    Go to Step 31

    17
     1. Turn OFF the ignition.
     2. Disconnect the camshaft position (CMP) sensor.
     3. Turn ON the ignition, with the engine OFF.
     4. Measure the voltage from the CKP sensor 12-volt reference circuit and a good ground with the DMM.
     5. Compare the measured voltage with the system voltage.
    Is the difference in the voltage more than the specified value?
    0.5 V
    Go to Step 18
    Go to Step 32

    18
     1. Turn OFF the ignition.
     2. Disconnect the C1 and C2 PCM connectors.
     3. Test for a short to ground in the CKP 12-volt reference circuit or the CMP sensor 12-volt reference circuit. Refer to Circuit Testing and Wiring Repairs.
    Did you find and correct the condition?

    Go to Step 37
    Go to Step 23

    19
    Test for an intermittent and for a poor connection at the ignition coil 8-way connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs.

    Did you find and correct the condition?

    Go to Step 37
    Go to Step 26

    20
    Test for an intermittent and for a poor connection at the ignition coil 8-way connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs.

    Did you find and correct the condition?

    Go to Step 37
    Go to Step 28

    21
    Test for an intermittent and for a poor connection at the ignition coil. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs.

    Did you find and correct the condition?

    Go to Step 37
    Go to Step 33

    22
    Test for an intermittent and for a poor connection at the CKP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs.

    Did you find and correct the condition?

    Go to Step 37
    Go to Step 31

    23
    Test for an intermittent and for a poor connection at the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs.

    Did you find and correct the condition?

    Go to Step 37
    Go to Step 36

    24
    Repair the open or high resistance in the ignition 1 voltage circuit between the fuse block and the splice. Refer to Wiring Repairs.

    Did you complete the repair?

    Go to Step 37


    25
    Repair the open or high resistance in the ignition 1 voltage circuit between the splice and the ignition coil connector. Refer to Wiring Repairs.

    Did you complete the repair?

    Go to Step 37


    26
    Repair the open in the ground circuit between the main 8-way connector and the ignition coil. Refer to Wiring Repairs.

    Did you complete the repair?

    Go to Step 37


    27
    Repair the open in the ground circuit. Refer to Wiring Repairs.

    Did you complete the repair?

    Go to Step 37


    28
    Repair the open in the low reference circuit between the main 8-way connector and the ignition coil. Refer to Wiring Repairs.

    Did you complete the repair?

    Go to Step 37


    29
    Repair the open in the low reference circuit between the PCM and the splice. Refer to Wiring Repairs.

    Did you complete the repair?

    Go to Step 37


    30
     1. Repair the ignition 1 voltage for a short to ground. Refer to Wiring Repairs.
     2. Replace the fuse.
    Did you complete the repair?

    Go to Step 37


    31
    Replace the CKP sensor. Refer to Crankshaft Position Sensor Replacement.

    Did you complete the replacement?

    Go to Step 37


    32
    Replace the CMP sensor. Refer to Camshaft Position Sensor Replacement.

    Did you complete the replacement?

    Go to Step 37


    33
    Replace the ignition coil. Refer to Ignition Coil Replacement.

    Did you complete the replacement?

    Go to Step 37


    34
    Replace the spark plug wire. Refer to Spark Plug Wire Replacement.

    Did you complete the replacement?

    Go to Step 37


    35
    Replace the spark plug. Refer to Spark Plug Replacement.

    Did you complete the replacement?

    Go to Step 37


    36
    Replace the PCM. Refer to Control Module References for replacement, setup, and programming.

    Did you complete the replacement?

    Go to Step 37


    37
    Attempt to start the engine.

    Does the engine start and continue to run?

    Go to Step 38
    Go to Step 3

    38
     1. Clear the DTCs with a scan tool.
     2. Turn OFF the engine for 30 seconds.
     3. Start the engine.
     4. Allow the engine to reach operating temperature.
    Are there any DTCs that have not been diagnosed?

    System OK
    Go to Diagnostic Trouble Code (DTC) List - Vehicle
    2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
    2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80

    ~Greg Huggins~
    Remote Tuning Available at gh[email protected]
    Mobile Tuning Available for North Georgia and WNC

  18. #18
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    Ahhh, never mind. Ya'll keep posting faster than I can
    2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
    2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80

    ~Greg Huggins~
    Remote Tuning Available at gh[email protected]
    Mobile Tuning Available for North Georgia and WNC

  19. #19
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    Quote Originally Posted by GHuggins View Post
    Ahhh, never mind. Ya'll keep posting faster than I can
    No your pictures is what helped me!! Would you happen to have a imige of the harness over the top of the intake?

  20. #20
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    About the best I can do...
    Attached Images Attached Images
    2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
    2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80

    ~Greg Huggins~
    Remote Tuning Available at gh[email protected]
    Mobile Tuning Available for North Georgia and WNC