Quote Originally Posted by afatboy View Post
TB42 efi. Starts fine when cold. Once up to normal running temp you can't turn it off or it won't start again. Will turn over no problems, you can smell it getting fuel, plenty spark from the coil and from dizzy to leads. Just won't fire. I was convinced it was the immobilizer, so I removed it. Still no success. Any ideas?
Plethora of reasons that can produced the above scenario. Always start with electrical side of the story as a rule of thumb.
Chekc the spark when hot, which includes the spark out of the leads as well as each spark plug. After ruling out the ignition system, then you can check the sensor like MAF etc and then move onto fuel pressure etc. Since the problem happens after warm up, tests should be done in the same condition.