Thread: Z4 Roadster (E85) 03 Z4, couple of problems.
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Old 07-26-2012, 04:14 AM
Mikey48 Mikey48 is offline
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Location: Charleston,S.C.
 
Join Date: Mar 2011
Posts: 413
Mein Auto: BMW Z4 3.0
I would install a fresh set of plugs. Then I would add a really good fuel system cleaner to the fuel system fill up with premium gas. Do this for the next 5 or so fill ups. Sounds to me like you got a lot of carbon build up in your engine. I had this problem with my 04 Z4 3.0i and it did the trick for me. My car now runs like new. It also sounds like your new tires are not balanced right. They will cause this problem if they are not balanced properly. These days they stick the balance leads on with double sided tape and they fall off most of the time. Mine did this also. Check your cooling system to make sure the water level is where it should be, it could be low. Good luck.
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