Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

dieseling

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73 Z28:
If your idle quality is good at 15 degreees advanced, but total timing is only 30 degrees, then I would seriously consider an aftermarket performance distributor. Increasing your base timing to 21 degrees to get 36 total probably will cause the dieseling to return when you shut down the engine. A performance distributor such as a pertronix will allow 24 degrees of mechanical advance allowing you to set your base timing to 12-15 degrees advanced and your total timing will come in at 36-38 degrees. This is just one example as there are plenty of good companies making performance distribs that will do the same.

Paul

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