<br><br>---------- Forwarded message ----------<br>From: <b>Robert Pink</b> <br>Date: Tuesday, October 29, 2013<br>Subject: Happy for 50 miles or so then not<br>To: Jerry Knotts <<a href="mailto:knottsj@galstar.com">knottsj@galstar.com</a>><br>
<br><br><div>Thanks for all the comments. Lots to think about.</div><div><br></div>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.<div>
<br></div><div><div><br></div><div>Any of the Space City boys want an early morning run on the back roads of north Houston on Saturday?</div><div><br></div><div>Rob <span></span><br><br>On Monday, October 28, 2013, Jerry Knotts wrote:<br>
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<div>Rob,<br>
<br>
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.<br>
<br>
jerry knotts<br>
<br>
<br>
On 10/28/2013 9:38 PM, Robert Pink wrote:<br>
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<blockquote type="cite">Would appreciate some thoughts.
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<div>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.</div>
<div><br>
</div>
<div>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.</div>
<div><br>
</div>
<div>
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.</div>
<div><br>
</div>
<div>Thanks for your thoughts </div>
<div><br>
</div>
<div>Rob</div>
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