RayKhan

The latest is that the cylynders are scored and thats why it doesn't have any compression. Let you know how it goes

A failed cat won't make it fire on only two cylinders, if it was blocked restricting flow it would only run at low revs. It should take a decent tech about an hour to establish if it has a spark at each cylinder compression and fuel pressure suck squeeze bang blow , if it has spark compression and fuel and it's all hapening at the right time it should work. if any of these are missing that's when the problems start . Electrical faults can take time to find and repair. ← Lexus UK inform me (note it has not been the dealer) that they think its a bent valve. They had already told me that the compression was fine! I am getting very disheartened!

A failed cat won't make it fire on only two cylinders, if it was blocked restricting flow it would only run at low revs. It should take a decent tech about an hour to establish if it has a spark at each cylinder compression and fuel pressure suck squeeze bang blow , if it has spark compression and fuel and it's all hapening at the right time it should work. if any of these are missing that's when the problems start . Electrical faults can take time to find and repair. ←

My GS300 mk2 has been with a Lexus dealer for close on 2 weeks now and they cant tell me why it wont run. It appears that it wont idle and or that it is only firing on 2 cyclinders! The last I heard was that it maybe the Catalytic converters, but that was 4 days ago. Lexus Customer Service phoned the dealer for me! Not really much service. I would welcome any suggestions on how to get the dealer to do something?