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  1. #1

    Angry which to replace first

    ALright i have been doing a motor swap now i used my orginally heads a intake for the vortec. Now when i go to start it i have now spark what so ever no going to the plugs and i pulled off my wire coming off my coil and i dont get spark there either so i was wonder should i just try to replace the coil or should i try to replace the ignition control module first difference in price is the coil is about 37 and than the icm is about 80 any thoughts of which fisrt or could there be something else that woulnt let me get spark thank you jay

  2. #2
    Master Mechanic Silverado Junkie's Avatar
    Join Date
    Feb 2010
    Lead Hill, Arkansas


    Id change out the coil first since its cheaper.
    1995 Silverado,Z71, 3-inch lift,2-inch leveling kit, SkyJacker Suspension, short ram-air intake, throttle body spacer, MSD ignition coil, straight pipes

  3. #3


    Could also be the Ignition Control Module...
    Pavement sucks... :grrrrrr:

    1994 K1500 4x4 Ext. Cab
    PCM chip and Xenon 8000k bulbs bored over .050"
    balanced Crank, 10:1 compression
    Flat top pistons,cam,ported heads
    Option Racing Cold Air Intake
    Holley Throttle Body Spacer
    Accell Igition, 45kv coil
    FloTech Headers, no CATs, dual exhuast
    Goodyear Silent Armor A/T 305/70-16
    Pioneer SupertunerIII CD USB Bluetooth
    Kicker ZX200.2 ZX Amp
    Kicker Audio COMP 10" Subwoofer

  4. #4


    alright i replaced both still no spark the cap and rotor was replaced about 20 to 30,000 ago along with plugs and wires and now i am sitting here dumbfounded i really would hate to take it to someone else and have to pay for it to get fixed

  5. #5


    Did you remember to connect the crank sensor when you connected everything up? If the crank sensor is not connected or is bad there will be no spark.

  6. #6


    its connected but i dont think it could of just went bad cause b4 i did the motor swap it did run but on the replacment motor i had to switch the timing covers could it be that there is a after market cam in it ? amd i was also told that if i am 180 off in my timing that i wouldnt get spark is that true?
    Last edited by somonenew1994; 03-01-2010 at 08:28 PM. Reason: more info

  7. #7


    alight i figured out one problem and got that fixed and than i started working on spark again pulled the cap off rotated it 180 and than put back on my cap and got spark so i went on trying to get her started and than i lost spark again so back with no spark i think the next thing i am going to repalce is the cap and rotor figured i heard a few people say they have changed them and they went bad no long after that so if you all have any other ideas let me know i am open to anything right now

  8. #8


    alright got spark back for a min it comes and goes i actually had it running for a few min today so now i am wondering if the bracket anit grounded enough that holds the icm and coil pack i replaced the cap and rotor at first i didnt have spark but than i played with the bracket and got spark so we are going to top off fluids and try to get the timing right and running good

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