OneTen Posted September 11, 2007 Share Posted September 11, 2007 Hi ! First, sorry for my English, this is not my native language. My problem is that my HSE is misfiring. I think it's on the right hand cyl. bank (2,4,6,8). It starts, but run rough on idle. What I have check out / replaced, is: Spark plugs = new (OE) HT leads = new (Bosch) Coils = have been testet ok in a work shop Wires from coils to ECM = ok Injectors = measured from plug on the ECM through injector to fuse 37 in fusebox, approx. 15 Ohm on all 8 Anyone? Regards from Norway Quote Link to comment Share on other sites More sharing options...
Bull Bar Cowboy Posted September 11, 2007 Share Posted September 11, 2007 Your English is better then my Norwegian A common fault is the the flywheel position sensor has coming loose. Its mounted on a metal plug and can be viewed from underneath. If it has moved then you will clearly see a shiny ring on the plug about 2mm wide. Re-seat the plug using Loctitie bearing seal, making sure you have the correct gap on the sensor. The ECU will have logged a load of fault codes ................. these will go after couple of days as it adapts to the correct settings Ian Quote Link to comment Share on other sites More sharing options...
OneTen Posted September 12, 2007 Author Share Posted September 12, 2007 Thank you for your reply ! Is the Flywheel position sensor = Crankshaft Speed and Position Sensor (CKP) ?? This one I haven't checked, so I'll do that. Quote Link to comment Share on other sites More sharing options...
OneTen Posted September 12, 2007 Author Share Posted September 12, 2007 No, this sensor wasn't loose. I took it out, cleaned it and reinstalled it. But how do I get access to the multi plug without removing all the exhaust pipes? Quote Link to comment Share on other sites More sharing options...
Bull Bar Cowboy Posted September 12, 2007 Share Posted September 12, 2007 Ah yes, the multiplug ....................... I think Land rover employ dwarfs with 0.5 metre fingers I think you will now need to read the ECU codes and see what is stored. A big problem is that the ECU is adaptive and compensates for faulty sensors. It would be good to get the codes read and the ECU reset .................... The other thing to check is the O2 sensors ...............check to make sure the heater is working and that the returned voltage looks correct. Ian Quote Link to comment Share on other sites More sharing options...
Hybrid_From_Hell Posted September 12, 2007 Share Posted September 12, 2007 If this has a coil pack of 1x unit with all 8 plug lead points on it these do fail. The later 2x twin packs are better, but not unknown to fail ? Testing I have known them pass, but for some odd reason they fail under engine running Nige Quote Link to comment Share on other sites More sharing options...
OneTen Posted September 12, 2007 Author Share Posted September 12, 2007 It's a 4.6 Thor engine with 2 coils with 4 plug lead points on each. Both coils have been tested with a dizzy in bench. I have one coil in spare, so I can swap one for a test. I managed to take out both coils without removing upper inlet manifold, so I can do it once more. Quote Link to comment Share on other sites More sharing options...
OneTen Posted September 13, 2007 Author Share Posted September 13, 2007 I changed the coil packs today, same result. I have installed new spark plugs. took them out today. Cyl 2 is black, less on cyl 4, even less on cyl 6 and cyl 8 was clean. Cyl 3 is black, less on cyl 3, 5 and 7. I know that cyl 2 and 3 is triggered at the same pulse. Cable from ECM to coil packs are ok. Maybe it's the output from ECM to coil? Connected OBDII reader today, no errors. But then again, isn't so that ECM can't 'see' if the coils are triggered? Quote Link to comment Share on other sites More sharing options...
Bull Bar Cowboy Posted September 14, 2007 Share Posted September 14, 2007 OK …. If you have error codes reported and everything looks OK on the ignition side, then it may be time to look deeper ………….. Do a compression check on the even cylinder bank ……………. You say that No 8 is clean and 6 is not so sooty as 2&4 ……………..get another plug and connect the No lead to it, to see if it is firing OK………….. with all the tests you have done the fault may not be ignition related. If the plug is firing OK, then check top see if the injector is firing ……… If that is OK and the compression is OK, you may have a slipped liner on the offending cylinder (or cylinders) …………. This also causes misfire, especially from cold and also on a hot restart. This fault will also give a very, very clean plug as it is almost being steam cleaned. Ian Quote Link to comment Share on other sites More sharing options...
OneTen Posted September 19, 2007 Author Share Posted September 19, 2007 Compression test done. I have a dip on cyl 4 and 5. Approx. 9,5 Bar on these and approx. 11 Bar on the rest. With a little dash of oil in cyl 4 and 5, I've got 11 Bar on these as well. Piston rings problem? Any advice on how to handle this one? Quote Link to comment Share on other sites More sharing options...
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