Dave,
I had that problem too in a Honda I owned.
'66 Mike
----- Original Message -----
From: David R. Conrad <conrad1@gte.net>
To: Datsun List <datsun-roadsters@autox.team.net>
Sent: Monday, June 05, 2000 4:23 AM
Subject: (Bizarre)Problem Solved!!
> Sorta long--neither my wife nor my dog wand to hear about this...
>
> I flung the gauntlet at Murphy again on May 21st.
>
> I had stated my roadster was "running a lot better than it had in a long
> time". I should have known better, for I have not been able to drive it
> on the road until today. Murphy got me good.
>
> Before making that "ill-fated" statement, I had accomplished a complete
> redo of ignition with both Pertronics and overhauled points ignition,
> new NGK plugs, set and reset valve clearances, adjusted and balanced the
> carbs
>
> Not leaving "well enough alone", I had proceeded to make a minor change
> to crab. #2 in a further attempt to keep it from blackening my #3 and #4
> plugs. I had been successful in getting it a lot leaner than it had
> been.
>
> Immediately thereafter, the engine began missing under load.
>
> Since the last thing I had done was to carb 2, I returned it to its
> state when the engine was running well. Didn't resolve the problem.
>
> The miss was so bad, I thought maybe something happened to cause loss of
> compression of a cylinder. Then I commenced a number of compression
> checks, wet and dry. Mean compression wasn't great, about 135, and one
> cylinder, #1, was lower than the recommended 10% of the mean, being
> about 120.
>
> The idle performance was still pretty good, and at 800 rpm it really
> wasn't obvious that it was missing. Could remove #4 and #3 plug wires
> with only a slight decrease in rpm. Could remove BOTH 4 and 3 and the
> engine still ran pretty well. Removing 1 or 2, with 3 and 4 reconnected
> resulted in "stumbling".
>
> So, went back to carburation, thinking maybe I could get it to run as
> well on 3 and 4 alone, as it did on 1 and 2 alone by better adjusting
> carb. 2.
>
> Well, that didn't work.
>
> So, what could it be? Ignition? New, carefully gapped plugs, two
> different distributors giving similar results. Sure didn't seem like it
> would be ignition.
>
> "Grasping at straws" decided to try previous (used) plugs in cyls. 3 &
> 4.
>
> Problem solved, #3 turned out to be the culprit
>
> Dave,
>
> '68 1600
> Kailu-Kona
>
> p.s., I refuse to commit as to how it's running now, but I'm smiling a
> whole lot.
>
> p.p.s.. I've never had a "bad" spark plug before. I still didn't
> believe it. Put the plug from #3 in #2 and the missing returned. So
> I'm running with one used plug.
>
>
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