Ken,
First thing I would check are the connecting rods to each carb to make sure
the rear carb isn't affecting the front carb. However you must make sure the
carbs are balanced correctly when your foot hits the pedal. If it's balanced
correctly correct at idle it may not be balanced when under power. It takes
awhile to get those PITA linkages correct.
If the rear carb is too rich some of the gas may be used by the front carb
or if the idle speed is too high the car may not die.
As for the rich front carb make sure the needle is correctly installled and
that the choke isn't hanging up. Could be a leaky float needle valve or the
float level is too high and gas is flowing into the carb at all times.
As for the miss it could be the spark plug possibly. I would also do a
compression test.
Mike
----- Original Message -----
From: "Ken Pearce" <ken__pearce@hotmail.com>
To: <datsun-roadsters@autox.team.net>
Sent: Tuesday, April 24, 2001 12:27 PM
Subject: Rough idle, #2 ain't firing...
> Well I decided to tune up the old SU's this past weekend since she was
> running a bit rough. I found that at low idle, the #2 cylinder isn't
> firing. I swapped the plug wire with #3 to see if the problem moved, but
it
> didn't. The car runs fine as soon as the rpms get about 1200 or so. Any
> ideas? Timing? (I'm going to check that this week)
>
> Here's my method for setting the SU's,
>
> 1.) Mixture settings out, all the way rich, then in about 3 turns
> 2.) I then use an airflow meter to balance the carbs.
> 3.) Then I lean them out to get a smooth idle making sure not to lean
them
> out too much. I disable one carb by lifting the plunger and make sure
that
> the engine can still run on one carb (albeit rough). If it stalls, I make
> it richer again.
>
> Here's where I have another question. I can run the front carb all the
way
> lean, and the engine will still run on that carb when disabling the rear.
> ???
>
> Any suggestions greatly appreciated...
>
> (Or maybe a "tune-up Ken's car at Brian's house" party! I'll bring the
> beer! Brian? Sean? Any takers?)
>
> Cheers!
>
> Ken Pearce, 68-2000 (only a 1500 at idle though)
> Bellingham WA,
> s/v Shantih
> _________________________________________________________________
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