Recent content by knmstag

Thanks again for your help. I need to investigate further, now I know where the relays are located. It's been a saga, but my son's car refuses to start, having replaced the starter motor. At least is does now turn over/crank! I suspect it may be the crank sensor at fault... If so, would this...

Thanks for prompt reply. This relay is not with fuse box behind glove box on passenger side, is it located under the dash panel?...I'm not sure of exactly where it is located in order to access it for test / replacement. - Thanks - Kevin

Ive ordered a new crank sensor, seem its worth a try. Hoe to replace it this weekend. Does anyone know where the fuel pump relay is located on the Z4 E85?

I am at home in Coventry. Car is at my son’s in Burton (40 miles away) I plan to visit this weekend, and try a few further checks. The crank sensor may have been disturbed or damaged whilst removing & fitting the starter motor. I want to also check the fuel pump relay, when I can locate it! I...

I have not checked the new spark plugs for spark. Old were were in very poor condition, as should have been replaced long ago. Can I check for spark at plug in conventional way, by positioning electrode onto body earth point, the cranking engine, obviously with coil pack and wiring attached? -...

Good afternoon all, I have just replaced the crank sensor and car still refuses to start! I have checked the fuel at Schrader valve on fuel rail and there is a healthy spurt of fuel ejected when pressed wit a screwdriver, However there is no spark or fuel at plugs. The fuel pump can be heard...

I fitted a new starter motor today! The good news is that engine is now cranking, and sounds promising...however car still will not start! I removed the spark plugs, expecting them to be soaked with fuel, but they were all bone dry! The plugs were in poor condition and should have been replaced...

Thanks again for your support, suggestions and shares experiences. A local auto key specialist has tested both keys in his workshop, and kindly visited the Z4 at my son’s house today in Burton. The keys are OK, and not cause of problem...keys & ECW box have been tested by locksmith using...

The battery I tried jump starting the Z4 was for a smaller car (1500cc), therefore I’m going to try the larger battery tomorrow. I will update this forum when I know more. Let’s hope I can get it fixed soon...thanks again guys!

Thanks for support. I will try a heavy duty battery from my Jaguar XJS, so worth a try. I will also check the voltage supply once again. I plan to get one of the keys reprogrammed tomorrow. It’s a process of elimination, albeit time consuming. The Z4 is not the easiest car to work on! 😢

It’s a manual gearbox. I’m going to get a new key, as that can be a problem if it can no longer be read by the lock barrel. Thanks to all for suggestions. Kevin

The new ignition switch arrived today, was fitted, but has not solved the problem. I plan to get a new key from a local auto. key specialist, but we are feeling very frustrated, having tried various potential causes, but still baffled!🙃

Just in case anyone needs to remove the starter motor on a Z4, you do not need to remove the inlet manifold! It’s possible to remove it on LHS, by removing air cleaner box and air mass sensor components. Thanks to YouTube video! :)

Thanks for message. I removed the starter motor and tested it on the bench, using a spare car battery. Earthed the casting body, positive supply on terminal post, and bridged across ignition switch terminal. Gear pinion moved rearwards and was rotating at speed, all sounded fine. I therefore...

Thanks for replies. Car is not turning over, but lights on dash and radio working. I tried using jump leads using another fully changed battery but no result!