KevWils

Thanks Trevor, Dave the advice is appreciated. The issue was around before the water pump and rad swap and had a new fuel filter fitted a while back thinking that might be part of the problem.  Others are mentioning the crankshaft position sensor, idle control valve or split somewhere in intake as possible sources.  Will check cam sensors are a start point. Cheers Kev.

Hi Stu thanks for the reply.  It's the 6-cylinder 2.2 litre version. I had a 4-cylinder 1.9 twin cam Z3 a while back which had the same cam sensor issue with the mis fire.  Does not seem the same on this car with no mis fire on the 6-cylinder and just had a new water pump and rad so no overheating. Maybe worth fitting a new cam sensor if the 6-cylinder has one. Regards 

Could anyone offer possible solutions/problem to some hot restart issues. Car runs fine up from cold but when hot can then not restart well, will not idle then stall when pulling away. Will restart and keep going with a few revs on but can soon drop out again. Seems down on power during this all going on. Once cooled off all normal again. Had time on a diagnostic at specialist but shows no fault codes so have little idea where any fault may be. Oddly at times temp gauge may show full hot even after been stood for a bit. Sensor issue or something sticking? Anyone had a similar issue and found a cure? Any guidance would be appreciated. Cheers

Thanks for the comments and advice Dave. Z now at local garage to find the problem, waiting their call back. If the fronts pulled for the fix and its not the water pump following your advice will have them switch it out.

cheers

Hi - not a nice sounding nose coming off the front end of my Z3 2.2i engine  have attached a short video. can anyone take a listen and give advice on possible / actual cause. Fan? Water Pump? Other?

regards

K-Wils