PONTIAC Stumbled on this today ...

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Jim Rockford

Master Mechanic
Nov 10, 2007
308
523
93
Shelby,N.C.
While browsing facebook Marketplace, ran across this little fellow for the price of free or donation, so i ran up this morning and relieved him of this item . Only had a single card for 91 and below domestics, but it works on my bonnie, I was looking for something like this so I could get more Data on the tuning of this carb, Whoever built this carb got it pretty close, Mixture dwells ranged from 45-48 so that explains the good mileage on the highway . Also found out this thing doesnt hit closed loop until 199-200 degrees .
 

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Jim Rockford

Master Mechanic
Nov 10, 2007
308
523
93
Shelby,N.C.
Scratch that closed loop this, after playing with this and setting the dwell and bumping the timing up to 10 degrees at Base withthe ESC unplugged , it now runs even better. and I did notice that no matter the coolant temp, the ECM will go into closed loop as soon as the O2 sensor gets to temp. so almost as soon as you start driving it its already going into closed loop.
 
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Oct 14, 2008
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Melville,Saskatchewan
Which is why a heated O2 is a nice upgrade. A very good find for free.
 
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Jim Rockford

Master Mechanic
Nov 10, 2007
308
523
93
Shelby,N.C.
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Reactions: 1 user
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