A misfire in time with an erratic tach is a sure sign of a problem in the LT
circuit, certainly in points ignition. With electronic it may depend on the
type of trigger and the way the tach is pulsed.
PaulH.
http://freespace.virgin.net/paul.hunt1/
-----Original Message-----
From: Don Walton <dhw@pinehurst.net>
To: mgs@autox.team.net <mgs@autox.team.net>
Date: 18 April 1999 14:30
Subject: Jumpy tach-engine miss
>Hello all, while dirving the 77b lately, the tach has started bouncing
>around and there seems to be a miss while holding a steady speed. When the
>engine is given more power such as passing or going uphill the tach settles
>down and is fine until a steady speed is again reached. Then the tach
>starts bouncing around again and the miss returns. I am leaning toward the
>wonderful Lucas electronic ignition system which is still on the car. If
>this is the case can another type of system be interchanged without
changing
>the ballasted coil? I have already changed back to twin SU's so I am not
>adverse to change. I just want the best setup for the car. If anyone out
>there in MG land has encountered this, please let me know. TIA Don Walton
in NC
>
>
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