[DeTomaso] Happy for 50 miles or so then not

[Jerry Knotts]

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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