Re: 33 dual coils question

Posted by Tim Cole On 2016/3/22 19:49:46

If you don't mind the wires being hooked up backwards then it doesn't matter. However, if you are trying to determine the cause of rough idle in those cars the ignition is not the place to start.

First divide the systems by blocking off the main vacuum line at the intake manifold with piece of card stock cut to fit. This shuts off the wipers, lubricator, and power brake system. If the misfiring is reduced then you have exogeneous vacuum leaks to fix.

If your car is a later 10th series it will have an anti-flood line with a ball check valve. If this is leaking it will cause misfires. As well, the manifold and that choke stove can have leaks. These can be checked using propane or a solvent. If feeding propane around the manifold causes idle quality changes suspect a vacuum leak.

You can check the ignition timing with a light, but I would first check the spark with an adjustable tester from NAPA. It should be at least 20Kv. If the dwell is or ignition timing is not steady then there is slop in the distributor that needs to be fixed.

As well, with the motor running lightly shake that armored cable for the coils. If idle quality changes there is a short.

A compression test should be done as well in case compression is uneven.

Finally those Stromeberg gas dumpers can have all sorts of problems like dirty main jet air bleeds that require experienced personnel.

I used to use a worksheet for these problem cars and record the results of all this testing.

Hope this helps.