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Old 12-07-2007, 02:21 AM
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Join Date: May 2006
Posts: 24
Where's #1 on the Dizzy?

While removing the intake manifold on my M117 V8 to fix a vaccuum leak, I randomly unplugged the spark plug wires from the distributor without noting which was #1. In reviewing some photos I took before I took this all apart, it appears that I had two crossed wires. Is it possible that I could have mixed up my plug wires (specifically I think I crossed 8 & 3) but that the engine was still running? Rough idle but fine at freeway speed? I've been chasing this rough idle for months now and had found a vaccuum leak in the intake manifold. But now I'm wondering if it may have been due to crossed plug wires all along? I'm planning to re-wire it in the correct order when I re-assemble but it will most definitely be different than it was when I started. Can anyone identify for me which lobe on the dizzy is #1?
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Old 12-07-2007, 03:52 PM
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Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,316
There should be a small mark on the top surface of the distributor housing that indicates where #1 plug wire goes.

As to your question about 8 and 3. No, the engine could not possibly have run smoothly or had much power.

If 8 and 3 were switched, 3 would be firing at the beginning of its compression stroke - it would have fuel but but it would not be compressed, which means there would be very little energy if there were any combustion at all. 8 would fire at the end of it's power stroke, doing no good at all.

I had to draw some diagrams to figure this out, and I would be interested in others' conclusions.
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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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