RobH Posted June 23, 2019 Report Share Posted June 23, 2019 Yes - that visible plume coming out of the carb is a bit of a give-away. Either the valve isn't closing fully or it is firing at the wrong time. (You do have the plugs connected 1243 and not 2143 ?) Quote Link to post Share on other sites
billy l Posted June 23, 2019 Report Share Posted June 23, 2019 RobH, I thought the firing order is 1342? Quote Link to post Share on other sites
Lebro Posted June 23, 2019 Report Share Posted June 23, 2019 On 6/21/2019 at 9:21 AM, ianc said: I'm delighted to see that Peter Cobbold is contributing once again - I am one of a great many who has missed his excellent and erudite contributions. Ian Cornish Welcome back Peter - we missed you. Firing order is 1342 Bob. Quote Link to post Share on other sites
RobH Posted June 23, 2019 Report Share Posted June 23, 2019 (edited) OOPs- my bad-sorry for the confusion, but the principle stands. My excuse is that if you look at the dizzy cap, then reading clockwise from top left the cables are connected 1243 but of course the dizzy goes round anticlockwise so the firing order is 1342. Edited June 23, 2019 by RobH Quote Link to post Share on other sites
Peter Cobbold Posted June 23, 2019 Report Share Posted June 23, 2019 It's not the SU Compression test will rule out sticking iv. or tappet. Could be tracked disy cap firing a front cylidner inapproriately when iv is open. Doesnt sound to me like swapped leads, its not misfiring enough Peter Quote Link to post Share on other sites
Peter Cobbold Posted June 23, 2019 Report Share Posted June 23, 2019 1 hour ago, Lebro said: Welcome back Peter - we missed you. Firing order is 1342 Bob. Thanks Bob, I drop in from time to time. Peter Quote Link to post Share on other sites
Geofftaylor Posted June 23, 2019 Author Report Share Posted June 23, 2019 Hi all, Thanks for all the input. The firing order is definitely correct and I now agree that the fault does not lie with the SU’s. I would be surprised if it is a valve as I have had the head off and they are all free in the guides and good contact on the seats. I won’t rule this out however. I did gap the tappets when replacing the head but will do this again along with a plug change and distributor check. The car doesn’t have points which have been replaced with Luminition ignition but the spark is good so don’t suspect that. Geoff Quote Link to post Share on other sites
Peter Cobbold Posted June 23, 2019 Report Share Posted June 23, 2019 Try another disy cap, not a lot else left except maybe rotor arm. Peter Quote Link to post Share on other sites
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