Dont suppose you used the same vacuum advance line each time?
Coz if there's a hole in it you may end up with symptons like yours. I had
the same problem with my 180b recently and replaced coils plugs many times
leads etc all parts then saw a tiny hole in my vac adv line. Doh ah well
might help ya
>From: "Terry Rudd" <[EMAIL PROTECTED]>
>Reply-To: [EMAIL PROTECTED]
>To: <[EMAIL PROTECTED]>
>Subject: RE: The "Datsun Miss"
>Date: Sun, 29 Apr 2001 23:21:59 +1000
>
>Paul,
>
>Have you done a compression test or tested for a leaking head gasket (leak
>down) or are you losing water. You say it's a regular single miss so I
>take
>this to mean that it's missing on every cycle or there about. If this is
>the
>case then the cause should be east enough to find as you only need three
>things to fire; i.e. compression, correct fuel/air mixture and strong
>regular spark so check it all out.
>
>#1 cylinder on a north/south engine is closest to the radiator and also the
>lead is the one pointing towards the passenger side headlight. The cylinder
>you have described and also the dizzy position is #4. The timing on a 4
>cylinder 4 cycle engine is the same for #1 and #4, only the camshaft/valve
>position when either piston is at TDC determines the difference between the
>compression and the exhaust stroke.
>
>LRP petrol will not cause misfiring by itself, granted the plugs do get a
>little dirtier than when run on super but ulp & pulp petrol burns much the
>same as LRP (it is pulp with a lead replacement additive) so you wont get a
>steely grey exhaust burn anymore, rather blackish in colour and the plugs
>seem to burn with a reddish tinge which I suspect is the additive. If you
>suspect it's something to do with LRP, may be worth sticking a tank of
>optimax through it and see what happens. Check that the carbie, the many
>vac
>lines attached to the stock carbie or the manifold are not leaking vacuum,
>also check your booster valve is working correctly.
>
>have fun, hopefully it's something simple to rectify,
>
>regards
>Terry
> -----Original Message-----
> From: [EMAIL PROTECTED]
>[mailto:[EMAIL PROTECTED]]On Behalf Of Paul W. J.
>Stanley
> Sent: Saturday, 28 April 2001 11:50
> To: OZDAT Mailing list
> Subject: The "Datsun Miss"
>
>
> The Datsun Miss is still haunting me. Now I have an L20B in the 200B
>with
>the standard downdraft carby, and I assumed the mmiss was from the points
>that looked as though they had done 100,000km so I had the pleasure of
>vulturing my friend's L20B since he has fitted a fancy CA18DET. Anyway I
>fitted the electronic dizzy and after figuring out that my cylinder 1 was
>at
>the back (firewall) of the engine, and the back driver's corner of the
>dizzy
>(is this normal?) only to discover the miss was still there.
> Now I'm suspecting either a combination of LRP and dirty carby (doubt it
>though...it's not a flat spot...just a regular single miss)
> Or it could be the old conections and wires powering the coil...need to
>replace the 70s ones with new millenium ones maybe. I've tried numerous
>leads and spark plugs, checked all the gaps etc
>
>
>
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