Keep in mind that the first place you have to start with on the SU is the
float level. Float level is the 'gross' mixture adjustment. If this is
off, no amount of 'fine' mixture adjustment with the idle mixture adjustment
will fix the problem.
Brian
-----Original Message-----
From: owner-datsun-roadsters@autox.team.net
[mailto:owner-datsun-roadsters@autox.team.net]On Behalf Of Ken Pearce
Sent: Tuesday, April 24, 2001 12:27 PM
To: datsun-roadsters@autox.team.net
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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