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Thread: 6al cutting out

  1. #1
    kdburris Guest

    Default 6al cutting out

    I am running a drag S-10 truck, small block chevy. I have installed the 6AL ignition, 8739 2-step, 8982 retard control, blaster 2 coil, 85551 distributor and 8.8 super conducter wires. The truck also has nitrous, 5800 rpm stall converter, trans brake, etc.
    Here is my trouble. I am launching off the trans brake and 2-step at 4,000 rpm. It launches hard then it's just like the ign. shuts off for a millesecond and right back on. It does this until just past 60' then it runs strong the rest of the way. The shut off, cut out happens 3 or 4 times in the first 60'. I have eliminated the fuel because it does it while on nos too. (nos has it's own fuel supply). I have the heavy black to a battery ground which is also chassis grounded, the heavy red is to the battery. All wire connections have been soldered. There is a ground from engine to chassis, ground from battery to chassis too. I have an alternator so voltage is 14.5 volts. Could it be a bad 2-step or a bad retard control? When it shuts off it doesn't go into a rev control, just off then back on. 60' times are 1.78 to 1.82 but the truck is running 7.30 and 107 mph in 1/8 mile. We have tried everything, all wiring has been checked and rechecked. Next time at the track I am going to unhook the 2-step to see what happens. MSD tech or anyone else got any suggestions? I sure could use any advise. Thanks

  2. #2
    MSDTECH8 Guest

    Default

    kdburris,

    Since all your wiring has been checked, I need you to perform one more test. I need you to make one pass with the 2 step module removed. You should still be able to launch the truck @ 4000 RPM, but you will need to hold the rpm steady while the trans-brake is active. If the problem still continues then we need to look further into the wiring. The ground path would be my first concern, when the suspension is shocked a ground path could not be consistant.

    MSDTach8

  3. #3
    jimmyallard2003 Guest

    Default

    I had the same problem in my s10 when it had a 406 sbc chevy in it with same 6al, same coil and same dist. I fought it for a month thinking all the wiring was perfect, but it turned out to be a ground problem. Just for the heck of it run a temp ground from engine to chassis to box in addition to your current ground.

  4. #4
    kdburris Guest

    Default msd ground

    Thanks for the help. I am going to try to ground from engine to chassis and then to 6AL ground. This makes sense, although we take for granted the ditstributer has a good ground it may not. I also read we should ground from head to head to chassis and to the 6AL box. It's going to be a couple weeks before I get to go back to the track so if anyone else has any suggestions please post them. I'll try anything and it could help others as well. Thanks again!!

  5. #5
    msdtech1955 Guest

    Default

    did the ground work?

  6. #6
    kdburris Guest

    Default

    MSD tech's, and all others, here is what I have done since the original post. I have ran a soldered ground wire from the back of each head then to the intake then to the firewall where it ties to the chassis/front of engine ground. From the firewall junction the ground continues to the MSD box ground which ties in with a ground wire back to the battery ground. All wires are soldered.

    Because of prior commitments I can not run the truck for a couple of weeks.
    What do you think? It's looking like a spiderweb with all the grounds. HaHa!

  7. #7
    msdtech1955 Guest

    Default

    well, that would be a "true" path to ground.:thumbup:

  8. #8
    kdburris Guest

    Default

    I got to run the truck tonight. First pass it was still cutting out. Not as bad but still significant. Truck ran a 7.73. I unplugged the 2-step box and put my 8,000 pill in launched the truck off the trans brake at 4,000 it did not cut out and the truck went a 6.83. Ran two more passes blew the tires off but still went a 7.10. Looks like a faulty msd 2-step box. MSD tech what do I need to do this was a new unit? I want to run a 2-step because it's easier to launch the truck this way. Thanks

  9. #9
    kdburris Guest

    Default

    Raced the truck today. Installed another new MSD 2-step controler. No cutting out. Truck ran a 6.41. Looks like it is a bad MSD 2-step that I had on it. Sure caused me a lot of headaches trying to figure it out. Now if a MSDTECH rep will answer me and tell me how they are going to make their product good I will be happy. MSD Tech Rep, where are you?

  10. #10
    msdtech1955 Guest

    Default

    call ( 915-857-5200) or email msdtech@msdignition.com

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