Markus Posted May 23, 2019 Report Share Posted May 23, 2019 My rebuild was finished and I got the Roadworthy Certificate (similar to MOT) and registration so I thought we would be using the 6 for a weekend club event starting tomorrow afternoon BUT now the previously reliable injection system has decided not to play nice. At low revs the engine is stumbling and running rough. Number 3 injection line has a much weaker "pulse" then the others and when I removed the plugs all except number 3 are really good with tan base electrodes and off-white insulators. Number 3 is black and sooty and dry. I've tried another injector but no improvement. Can anyone suggest my next move (be nice). Thanks in advance. Mark Quote Link to post Share on other sites
Kevo_6 Posted May 23, 2019 Report Share Posted May 23, 2019 10 minutes ago, Markus said: My rebuild was finished and I got the Roadworthy Certificate (similar to MOT) and registration so I thought we would be using the 6 for a weekend club event starting tomorrow afternoon BUT now the previously reliable injection system has decided not to play nice. At low revs the engine is stumbling and running rough. Number 3 injection line has a much weaker "pulse" then the others and when I removed the plugs all except number 3 are really good with tan base electrodes and off-white insulators. Number 3 is black and sooty and dry. I've tried another injector but no improvement. Can anyone suggest my next move (be nice). Thanks in advance. Mark Hi Mark Have you checked to see if there is a nice cone spray from that injector and it’s not dribbling. Might be a bit of dirt in the injector. Depending on what type of injector it is you can pull the end nib with your finger nail only and that might clear it or give the injector a slight tap on a piece of wood. This is of course if the injector is dribbling. God luck. Quote Link to post Share on other sites
Mk2 Chopper Posted May 23, 2019 Report Share Posted May 23, 2019 After checking and if you are getting a good cone spray, I'd be changing that plug. Gareth Quote Link to post Share on other sites
Kevo_6 Posted May 23, 2019 Report Share Posted May 23, 2019 Just now, Mk2 Chopper said: After checking and if you are getting a good cone spray, I'd be changing that plug. Gareth Good point Gareth, especially if it’s a NJK plug. Quote Link to post Share on other sites
DaveN Posted May 23, 2019 Report Share Posted May 23, 2019 (edited) Swop it with another cylinder? Also take a looksee in the injector as some may still have the mesh filter. Edited May 23, 2019 by DaveN Quote Link to post Share on other sites
Mike C Posted May 23, 2019 Report Share Posted May 23, 2019 Make sure your fuel is fresh. Quote Link to post Share on other sites
Bill Bourne Posted May 23, 2019 Report Share Posted May 23, 2019 Not sure if this helps, but have found recently that after using 2 tanks of Shell V power made mine run rough. I guess it's the Ethanol content being increased ??. Started using Esso 97 and slowly all came back to running nice again best Bill Quote Link to post Share on other sites
Waldi Posted May 23, 2019 Report Share Posted May 23, 2019 If all the above still does not resolve it, swap the plug lead too. Waldi Quote Link to post Share on other sites
Markus Posted May 23, 2019 Author Report Share Posted May 23, 2019 Thanks gents. I'll check the injector again as well as replace the plug and I have a spare lead I can try too. Fuel is fresh and no change from what I've been running for the past 10 years. BP Ultimate. Fingers crossed! Mark Quote Link to post Share on other sites
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