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Re: Miss Under Load

Subject: Re: Miss Under Load
From: Paul Root <>
Date: Mon, 20 Nov 2006 20:02:44 -0600
It could be that the bush is worn out in the dizzy. Causing the
rough running that the PO was experiencing. And now it has gotten

A pertronix isn't really going to fail that way. Being electronic,
it's either all or nothing. So I wouldn't have expected points to
improve things.

Many replacement parts can come bad new. I might suspect a slight
crack in the distributor cap.

On Nov 20, 2006, at 3:41 PM, wrote:

> I am new to this list and have recently purchased a 1973 MGBGT.   
> Hopefully
> someone can help me sort out an engine miss I am experiencing at  
> highway
> speeds when under load.  This miss is severe and is especially  
> prominent
> when I reach about 60 MPH and press on the gas to go faster or if I  
> put it
> in overdrive and accelerate, or if I start up a slight grade.  I do  
> not
> experience the miss when the car is not under load.
> When  I purchased the GT the PO had installed a pertronix ignitor  
> in the
> distributor because he said that he had a lot of difficulty getting  
> it to
> run smoothly with points and condensor.  For the first 500 miles or so
> after purchase the GT ran fine and only recently developed this  
> missing
> problem.  I switched the ignition back to points and condensor but  
> there
> has been no improvement.  The GT has the SU HIF carbs and I checked  
> them
> for flooding and all looked in order.  I checked for fuel flow and  
> there
> is no apparent problem there.  The fuel filters are clean and
> unobstructed.  I checked the spark plugs and they were not fouled and
> looked normal but I replaced the spark plugs and ignition rotor and  
> still
> no improvement.  The distributor cap and wires were replaced by the  
> PO and
> look good.  The GT idles smoothly and runs good around town in 1st,  
> 2nd,
> and 3rd gears.  But once I get up to speed in 4th gear and in  
> overdrive
> the missing occurs.  Any helpful ideas will be appreciated!  Thanks in
> advance.
> Bernie

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