Crane Vaccuum advance makes backfire - carb?

dbfarr

Member
Sep 17, 2005
191
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17
Boise ID
Hi all this one has me stymied, and is costing me a load of fuel.

recently, i had to replace a bad distributor. Naturally I removed my Crane Cams 99607-1 before returning the old distributor for a core. I did not remove the advance springs. I did not put new advance springs in the new distributor.

I installed the replacement distributor and hooked up the crane unit. My timing was set to 15* initial.

The car immediately popped and fired through the carb. If the vacuum advance is disconnected, the car runs fine. Although, the mileage is terrible.

Is the crane unit bad?

Any thoughts?
 
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Don, you may be able to find a set of light weight replacement springs locally. Or, at least you should be able to.
At 15 initial, with the stock, stiffer springs, I can see why it might think it's too far advanced...