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

MSD Problem

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Old Apr 10, 2003 | 10:33 PM
  #1  
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Default MSD Problem

I just installed an MSD coil,cap and wires and what a difference. I dont know
why I waited so long to this mod but when I drove the car on the highway at WOT I noticed the RPMs kicking back.Is this my knock sensor pulling timing or just my rpm gage going wacky?Cant feel any power loss when this happens
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Old Apr 10, 2003 | 10:53 PM
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Default Re: MSD Problem (91superram)

I had the same problem in my l98 when i went to all accell stuff. I believe it's caused by the tach filter. I'm sure others will chime in...
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Old Apr 10, 2003 | 11:21 PM
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Default Re: MSD Problem (FoolCrzy)

Mine does the same thing. I have a MSD coil.
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Old Apr 11, 2003 | 01:30 AM
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Default Re: MSD Problem (severe-1)

MSD claims your supposed to by-pass the tach filter. I didnt touch it, and it works fine. My tach is VERY accurate. Try by-passing the tach filter like they tell you to
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Old Apr 11, 2003 | 03:00 AM
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Default Re: MSD Problem (91superram)

That's how mine acted when I installed my 6AL. I removed the tach filter and no problems now.
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Old Apr 11, 2003 | 07:31 AM
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Default Re: MSD Problem (StealDads67)

My tach is VERY accurate.
Put your car on a dyno and you'll sing a different tune.
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Old Apr 11, 2003 | 09:05 AM
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Default

When you say MSD coil...... do you mean just a new ignition coil or did you go with a full MSD box?
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Old Apr 11, 2003 | 09:37 PM
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Default Re: MSD Problem (scorp508)

Just the ignition coil and wires


[Modified by 91superram, 2:41 AM 4/12/2003]
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Old Apr 11, 2003 | 09:39 PM
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Default Re: MSD Problem (eguyett1985)

Where is this tach filter located?
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Old Apr 12, 2003 | 12:57 AM
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Default Re: MSD Problem (91superram)

You should not need to be bypassing the tach filter. That is only if you are using an MSD box.
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Old Apr 12, 2003 | 02:03 AM
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Default Re: MSD Problem (91superram)

Correct, you should only need to remove the tach filter with the ignition control unit not just the coil.
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