Hi Mike. I do not have the ability to run engine fault code diagnosis, I only have air suspension s/w at the moment. I may have to get it or get it done. Mileage is 144000. Serviced regularly by myself, recently had both Lamda sensors replaced and a full LPG overhaul about a year ago. Oil is good due for a change in June. Has suffered some recent overheating due to a coolant leak now repaired. Did not exhibit any problem at that time. My next move may be to test cylinder compressions but I have not started that yet as it is somewhat fiddly to get to all cylinders with a handheld device and fault may lie elsewhere anyway.
To get to the Cam shaft drives and chain does all the kit at the front of the engine have to come off first - aircon compressor, water pump alternator etc.
OK I will tackle the rocker covers first and then check compression. My feeling is the RH bank is the problem area as that was where the misfires came from. I can more easily check compressions that side as well. I will probably come back to you as I progress.
Got the rocker covers off, nothing broken, all valves seem to be working in sequence. Compression's generally good 130 - 150 psi, 1 lower at 110 - No1 on RH bank. No evidence of coolant getting into cylinders - all spark plugs sooty/slightly oily none looking pressure washed! Any other suggestion please?
I can't be sure now whether it was a clatter from the engine vibration against the frame of the engine bay or from the engine, but I could not really say if it was from the bottom or the front/rear. When engine turns over on starter - all plugs out - it sounds OK
So far I have checked all compression's and inspected both rocker shafts - no obvious damage and everything working OK when cranked round. (I have lashed up a remote to the starter relay) I have also confirmed there is a signal from the crankshaft sensor. So I think I have eliminated mechanical faults so we have to look at the electrical system. A friend is bringing a data code reader so I can have a look at the fault codes - I have a full list. Anything else you can suggest on the mechanical side or electrical side?
That's right there was no engine management systems light so a mechanical faults was indicated but I will see what the Fault codes show.