MSD 6AL need help
Thread Starter
Drifting
Joined: Mar 2003
Posts: 1,324
Likes: 0
From: sussex nj
MSD 6AL need help
MSD 6AL have it hooked up in my 94 now my tach jumps around and doesnt work right and im getting a service asr light when i hooked up the scan tool it said its getting a electric pulse i guess from the msd box what can i do to fix these problems? :confused:
Safety Car
Joined: Feb 1999
Posts: 3,504
Likes: 4
From: Mexico Beach FL
Re: MSD 6AL need help (fiberglasscoffin)
MSD 6AL have it hooked up in my 94 now my tach jumps around and doesnt work right and im getting a service asr light when i hooked up the scan tool it said its getting a electric pulse i guess from the msd box what can i do to fix these problems? :confused:
As far as I know, the only C4 that didn't have a tach filter is the '96. On the '96, the ECM has a dedicated tach signal output from the ECM to the tach. On the others, the tach is normally driven from the ignition coil negative side. Since this signal has spikes on it, the tach filter is needed to eliminate the spikes. But, with the CDI systems, there are no spikes, so the tach filter isn't needed.
Tom Piper
Melting Slicks
Joined: Sep 2000
Posts: 2,710
Likes: 1
From: Green Bay WI
Re: MSD 6AL need help (fiberglasscoffin)
You have to bypass the tach filter. On mine, the filter had two white wires and a black wire (looks like a small "rubbery" box). Simply cut the two white wires (make sure you leave enough room to reconnect if needed) and wire them together. I'll see if I have some pics of the filter itself... :)
Safety Car
Joined: Feb 1999
Posts: 3,504
Likes: 4
From: Mexico Beach FL
Re: MSD 6AL need help (cprgmr)
ever here of the asr light coming on after hooking up the msd box?
When you bypass the tach filter, I suspect that not only will it fix your tach, it will fix your ASR problem.
Tom Piper
[Modified by Tom Piper, 4:55 PM 7/27/2003]
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