Like Pete said, lots of good suggestions, but remember there's an order to
be followed. As was mentioned, first make sure the distributor is in good
condition and functioning properly.Worn bushings on the shaft, or anything
else that creates play in the shaft leads to erratic timing. I'm not sure
if the breaker point mounting plate is still available, but that's always
been a weak point in most of the Nissan units.
Set up the points first, preferably using a dwell meter instead of by
measuring the point gap. Then you need to set the initial timing. That
varies somewhat by model and year, or if you've got a breakerless setup.
IMO, it is best to swap in a breakerless system. Doing so takes away many
of the normal trouble spots in an ignition system. Even on a breakerless
distributor the distributor shaft and mechanical advance systems still need
to be checked. As I mentioned you need a dwell meter to set the points and
a decent timing light to set the timing. Eyeballing either just doesn't
work.
After the timing's set properly you can start looking at the carbs. First
thing I'd look for is any play in the throttle shafts. If they're worn
you'll never get the carbs set so that the engine runs properly. If the
shafts are okay, check the float levels and other items mentioned.
HTH,
Ron
On Tue, Nov 27, 2012 at 10:13 AM, Pete Peters <ppeters914@comcast.net>wrote:
> Lots of good suggestions, but did it ever run & idle correctly, and not
> backfire, i.e. are these long-standing issues, or did they appear after
> replacing the parts? If these are new issues, when and/or how many miles
> ago did it run properly?
>
> Pete
>
> ----- Original Message -----
> From: "Roy Haslett" <hrhaslett@yahoo.com>
> To: "Datsun Owners List" <datsun-roadsters@autox.team.net>
> Sent: Monday, November 26, 2012 8:56 PM
> Subject: [Roadsters] 1600 tuning issues
>
>
> > Hey All,
> > I just replaced my fried points, condensor, cap and rotor...plugs
> > too. My 1600 was running poor and backfiring, alot of hesitation too.
> > Adjusted valves as well to .017 hot.
> >
> > My problem is its still running weird, backfiring on deceleration.
> > I have adjusted the timing as best as I can and
> > acceleration is strong, just the sputtering and backfires when backing
> > off...idle is not great either....its high at about 1100 rpm and I can't
> > get it lower.
> >
> > Any suggestions as to tuning?
> > Thanks,
> > Roy Haslett
> > 67 early 1600
> ________________________________________
>
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