I drove my z about 150 miles over the weekend none stop, when the car was restarted from cold (about 6 hours after the 150 mile trip) I noticed it was misfiring, I drove it about 1 mile, stopped the engine, restarted it and it was back on all 6. I drove the 150 miles home with no problem.

 

Last night the problem came back again after a little bit of spirited driving, I turned the engine off and back on but still there, I got the car home and found if I pulled the coil plugs cylinder 5 made no difference. I stopped the engine and swapped the coil pack with cylinder 4 and restarted the engine, seems fine again now.

 

Obviously I will see soon if the misfire has changed cylinder now and will check the resistance accross the injectors, failing these what else should I do, in what order to fix my misfire?

 

Thanks, dan

Loosing cylinders and cutting out on a hot engine only to magically fix itself once cooled down is classic series 1 PTU problems. So it would be worth trying a different one. It's also worth pulling the plug to see what it looks like excessive blackness or a wet plug may give clues to the issue.

Cheers, will bear that in mind

 

I did however listen to the injector and it wasn't firing, I cleaned the connections as best I could and hasnt done it since. If it does it again I will be on the hunt for a PTU, cheers.