[DeTomaso] Fwd: Happy for 50 miles or so then not

[Robert Pink]

---------- Forwarded message ----------
From: *Robert Pink*
Date: Tuesday, October 29, 2013
Subject: Happy for 50 miles or so then not
To: Jerry Knotts <knottsj at galstar.com>


Thanks for all the comments. Lots to think about.

I have an MSD ignition system. Much of the car has been rebuilt but I
reused the coil, ignition system etc from the prior owner. I will start
with the coil and the plugs but then need a 60 mile drive or so to test it.


Any of the Space City boys want an early morning run on the back roads of
north Houston on Saturday?

Rob

On Monday, October 28, 2013, Jerry Knotts wrote:

>  Rob,
>
> Sounds like a classic Duraspark problem, although normally it gets well
> for awhile after a short time.  If you don't have a Duraspark ignition
> forget that.   It sounds electronic or electrical.  At one time I created
> that problem accidentally by clamping the points wire between the
> distributor cap and the base.
>
> jerry knotts
>
>
> On 10/28/2013 9:38 PM, Robert Pink wrote:
>
> Would appreciate some thoughts.
>
>  When I first start my car and drive it runs great for 50 or 60 miles. At
> 3000 RPM cruising the air/fuel ratio is high 13 to 14. The vacuum is 18 to
> 20 and the car runs smooth.
>
>  After about 60 miles the air/fuel ratio drops to low 10, the vacuum
> drops to 13 and the car vibrates and runs rough.  It appears to be missing
> and I suspect the ignition system.
>
>  What is confusing is that if I stop for lunch or even after one night
> the problem continues. But if  the car sits for a week or so it goes back
> to running fine . The problem never occurs unless I drive 60 miles or so.
>
>  Thanks for your thoughts
>
>  Rob
>
>
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