duraspark ignition erratic???

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Dec 9, 2007 | 09:13 PM

#16

Art

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Joined: Jul 1999

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From: USA

Quote:

Originally Posted by ErrorS

Are you 100% sure your mechanical advance is OK?

I checked it by rotating it by hand and it returns back to the non-advanced position indicating some spring is still intact. Later I revved the engine while watching the timing mark "move" under the timing light. It advanced as soon as the engine speed increased and then the advance rate tapered off as engine speed continued to increase. Having a dual-rate caused by the two different spring rates on the weights - just like it should be.

Dec 9, 2007 | 09:19 PM

#17

Art

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Joined: Jul 1999

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From: USA

Exchanged the Duraspark box with a known good one from a different truck I scapped a while back... and it is still acting up. I'll check the ignition coil and disassemble/inspect the distributor tomorrow. Anyone know the resistance specs for the ignition coil windings? I thought they were listed on the old Sun Tune-up cards...

Any other suggestions???

Dec 9, 2007 | 09:23 PM

#18

Mil1ion

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How many miles on this engine ?

Hi-Miler ?

Dec 9, 2007 | 09:36 PM

#19

Art

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Joined: Jul 1999

Posts: 472

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From: USA

[QUOTE=Mil1ion
How many miles on this engine ?

Hi-Miler ?[/QUOTE]

A few thousand since the rebuild, maybe about 6000 or so. Distributor may have as much as 140,000 on it though. Tomorrow it has an appointment on the operating table (workbench).

When watching the timing marks under the timing light, they are nice and steady (not jumping or bouncing around) when the engine is idling and revved.

BTW, Thank you very much for the resistance specs. Exactly what I needed!