weird motion

nikijack · 06-16-2025, 04:57 PM

Hi: i just bought a 2003 Z4, 30,000 km. Rough roads around here. First thing I did was change the 22 year old runflats to Michelin Pilot 4S. Then I changed the transmission fluid to Redline A4. Both made a huge difference, but, I'm suspecting the 22 year old Boge shocks are shot. I've always run Bilsteins in my BMW's. Maybe that's the next move. There's also a slight feels like a misfire at about 2400 RPM, especially when cold. New plugs? I mean 22 years is old. Maybe clean the throttle body? thanks, Jack

3002 tii · 06-16-2025, 07:30 PM

“Weird motion” doesn’t describe anything lol

06-16-2025, 04:57 PM	#1
nikijack Second Lieutenant 62 Rep 287 Posts Drives: 435i, manual,red, Z4, blue Join Date: May 2010 Location: Markdale, On, Canada iTrader: (0) Garage List 2014 BMW 435ix [0.00] 2003 BMW Z4 [0.00]	weird motion Hi: i just bought a 2003 Z4, 30,000 km. Rough roads around here. First thing I did was change the 22 year old runflats to Michelin Pilot 4S. Then I changed the transmission fluid to Redline A4. Both made a huge difference, but, I'm suspecting the 22 year old Boge shocks are shot. I've always run Bilsteins in my BMW's. Maybe that's the next move. There's also a slight feels like a misfire at about 2400 RPM, especially when cold. New plugs? I mean 22 years is old. Maybe clean the throttle body? thanks, Jack Last edited by nikijack; 06-30-2025 at 08:19 AM..
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06-16-2025, 07:30 PM	#2
3002 tii Lieutenant General 2980 Rep 12,994 Posts Drives: Z4 M, X5, GX460 Join Date: Apr 2008 Location: CT iTrader: (109) Garage List E86 Z4 M GTS [9.91] F15 X5 35i [9.17] F10 550i (Retired) [9.17] F25 X3 35i (Retired) [9.43] E85 Z4 M (Retired) [9.44] E82 135is (Retired) [9.53] E90 328xi (Retired) [9.25] E86 Z4 3.0si (Retired) [8.95]	“Weird motion” doesn’t describe anything lol __________________ Follow for latest mods
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