Chazza Posted March 24 Share Posted March 24 Hello everyone, My Disco 1 has been stuck in the shed since May last year with a misfiring problem on No.3 cylinder. I rebuilt the engine 3 years ago, properly, and it was running superbly when it was last driven and then not running the next morning. The car has done 320 000km and is in good condition. A compression test showed every cylinder on the same pressure at about 170psi cold; which indicates to me that the valves are working properly. No.3 spark plug is always clean (no soot) and fuel is obviously rich at the exhaust outlet and is exploding in the system. The other 7 plugs are dry and sooty. So a list of parts changed; New spark plugs. New distributor cap. New coil – the right type. Ohms test on all high-tension leads; the figures made sense. New airflow meter. All injectors sent away for a clean and check. New injector on No.3 New fuel temp sensor. We have tested the ohms on the harness to the injectors and No.3 was different to the rest, so my brother soldered all of the harness joints, on both sides of the engine. Can anybody think of something I have missed? It has been quite maddening to have the car off the road for so long, Cheers Charlie Quote Link to comment Share on other sites More sharing options...
simonr Posted March 24 Share Posted March 24 Have you checked that you actually have a spark on No3 plug by running with the plug removed? Quote Link to comment Share on other sites More sharing options...
Chazza Posted March 24 Author Share Posted March 24 Yes. Quote Link to comment Share on other sites More sharing options...
JohnnoK Posted March 25 Share Posted March 25 I see you fitted a new injector, does it actually work? Perhaps try swapping two injectors on that bank around and see if the snag moves to another cylinder. Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted March 25 Share Posted March 25 Does the branch of the manifold cold when starting up? I'd suggest a stuck injector, all too common when getting them cleaned, so I have found. You can remove, stick 12V to it while blowing through it, if it doesn't click an open it is dead/stuck. Quote Link to comment Share on other sites More sharing options...
Chazza Posted March 25 Author Share Posted March 25 15 hours ago, JohnnoK said: I see you fitted a new injector, does it actually work? Perhaps try swapping two injectors on that bank around and see if the snag moves to another cylinder. Good idea, thank you. Quote Link to comment Share on other sites More sharing options...
Chazza Posted March 25 Author Share Posted March 25 14 hours ago, Bowie69 said: Does the branch of the manifold cold when starting up? I'd suggest a stuck injector, all too common when getting them cleaned, so I have found. You can remove, stick 12V to it while blowing through it, if it doesn't click an open it is dead/stuck. Thank you for your suggestion. It idles on all 8 cylinders but I will check with a thermometer to see how hot the exhaust manifold gets. Can you suggest where I can buy a plug to go on the injector? I can make a test-lead, Cheers Charlie Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted March 25 Share Posted March 25 No need for a plug, just poke the wires in, if you do want a plug, they are known as junior power timer, and common as muck. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted March 26 Share Posted March 26 On 3/25/2024 at 7:57 AM, Bowie69 said: You can remove, stick 12V to it while blowing through it, if it doesn't click an open it is dead/stuck. Worth saying that just applying 12v to it continuously is not good for it, tapping the wire on/off is a nicer way of doing it. Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted March 26 Share Posted March 26 32 minutes ago, FridgeFreezer said: Worth saying that just applying 12v to it continuously is not good for it, tapping the wire on/off is a nicer way of doing it. Erm, yep Should have said that Quote Link to comment Share on other sites More sharing options...
Chazza Posted March 26 Author Share Posted March 26 14 hours ago, FridgeFreezer said: Worth saying that just applying 12v to it continuously is not good for it, tapping the wire on/off is a nicer way of doing it. Thank you. Quote Link to comment Share on other sites More sharing options...
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