[DeTomaso] Happy for 50 miles or so then not
michael@michaelshortt.com
michaelsavga at gmail.com
Mon Oct 28 22:50:34 EDT 2013
What kind of camshaft do you have?
Obvious things are vacuum leak ( brake booster and misc lines ) , sticky
throttle spring, sticky valve spring, ignition and if engine piston rings
are worn, it will create less manifold pressure as it gets warmer and
warmer.
A performance cam will make less vacuum by nature.
Michael Shortt
On Oct 28, 2013 10:40 PM, "Robert Pink" <robpink2012 at gmail.com> 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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