C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

MSD 6AL tach problems

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Old Aug 26, 2005 | 12:13 PM
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Default MSD 6AL tach problems

I´ve have a problem, I´ve checked the search forums and did´t find anything.

Have a vette Lt1 1992

I installed the MSD 6AL with a coil blaster partnr: 8226 with a harness 8876. Everyting went well exept the tachomteter get freaked out when I reach 4000rpm and the "Service ASR" is warning.

When I take away the MSD box everyting works. I read in a thread that I must do someting with a the cabel to the tach and attach that one on the tach output on the MSD box.
That I understand in the garage, but what cabel shall I cut and put in the MSD box? Or is it some else trick to make this work?

Thanks //Andreas
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Old Aug 26, 2005 | 12:16 PM
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You need to remove the tac filter. The MSD already has a tac filter built in so the 2 of them screw each other up.

Your tac filter is a little box near the ignition coil which is basically built into the wring harness. It will have 3 wires coming out of it 2 white and one black. It needs to be removed.

Then your tac will work great.
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Old Aug 26, 2005 | 12:20 PM
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I used the counterpart before, the Accel 300+. I had the same problem and i ended up disconecting the box. Funny it was a 92, it burned on the freeway on 7 Jan 2003. Watch out, fiberglass burns FAST
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Old Aug 26, 2005 | 12:30 PM
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Hope it won´t happen to me.

I going to the garage and test what u said. Hope it work.

Greetings Andreas
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Old Aug 26, 2005 | 03:29 PM
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Well it was as you told me, but the white from the "intake" I had to connect with the white from the coil to have the tach to work, but it was as you told me (once again)

Now it works perfect!

Thanks alot

//Andreas
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Old Aug 26, 2005 | 04:01 PM
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