maxitoman007
Member
- Joined
- Feb 15, 2017
- Location
- Calgary, Alberta, Canada
Hello. So I?m trying to install my MSD 6A on my LH 2.2 1987 740 turbo. I can get the car started using the 6A but it stutters to start and idles rough. Let me explain.
It is worth noting that I am still using the stock coil, distributor and spark plug wires.
I first installed the MSD exactly as the instructions state. Car cranked but didn?t start.
Big red ?> battery +
Big black ?> battery -
Small red ?> original coil + (blue wire)
Small white ?> original coil - (red+white wire)
Black + orange ?> coil - and + respectively
Grey (MSD rpm signal) ?> not connected to anything
I then installed the MSD using a dummy coil for rpm signal. Car was hesitant to start but started and idled rough (almost seemed like a misfire).
Only difference in wiring:
Small red ?> dummy coil + ?> original coil + (blue wire)
Small white ?> dummy coil - ?> original coil - (red + white wire)
When I return the wiring to original the car starts and runs normal.
I?m guessing the dummy coil and therefore rpm signal is necessary for proper spark as the original rpm signal wire (original coil - (red+white)) runs through the powerstage. This would explain why the car didn?t start at all with no dummy coil.
Any ideas on how to smooth things out? Do I need to purchase the proper tach adapter? Could it just be a bad dummy coil? worn distributor/plug wires that can?t handle the now stronger spark?
Any help is appreciated. Thanks.
It is worth noting that I am still using the stock coil, distributor and spark plug wires.
I first installed the MSD exactly as the instructions state. Car cranked but didn?t start.
Big red ?> battery +
Big black ?> battery -
Small red ?> original coil + (blue wire)
Small white ?> original coil - (red+white wire)
Black + orange ?> coil - and + respectively
Grey (MSD rpm signal) ?> not connected to anything
I then installed the MSD using a dummy coil for rpm signal. Car was hesitant to start but started and idled rough (almost seemed like a misfire).
Only difference in wiring:
Small red ?> dummy coil + ?> original coil + (blue wire)
Small white ?> dummy coil - ?> original coil - (red + white wire)
When I return the wiring to original the car starts and runs normal.
I?m guessing the dummy coil and therefore rpm signal is necessary for proper spark as the original rpm signal wire (original coil - (red+white)) runs through the powerstage. This would explain why the car didn?t start at all with no dummy coil.
Any ideas on how to smooth things out? Do I need to purchase the proper tach adapter? Could it just be a bad dummy coil? worn distributor/plug wires that can?t handle the now stronger spark?
Any help is appreciated. Thanks.