Z4M rough idle, loss of power, stuttering & sounds like a diesel VIDEO

arobyte · 08-25-2012, 05:27 PM

Yes it was coils. 3 of 6 coils were bad. Replaced and car drives amazing again.

Thanks all for your input.

Kgolf31 · 08-25-2012, 06:18 PM

Looking back do you think it was smart to rev an engine running on 3 cylinders?

Caddyshk · 08-25-2012, 06:43 PM

Interesting that 3 would go at the same time?

arobyte · 08-26-2012, 09:25 AM

Quote:

Originally Posted by Kgolf31

Looking back do you think it was smart to rev an engine running on 3 cylinders?

Since it helped in quickly diagnosing the issue with the fine people on this board, no regrets.
So the next guy doesn't need to rev his engine to figure it out.

thekurgan · 08-26-2012, 04:32 PM

Quote:

Originally Posted by Caddyshk

Interesting that 3 would go at the same time?

I would have replaced all 6 of those things, seems it should be routine maintenance ~ 30k LOL

Caddyshk · 08-26-2012, 06:42 PM

Thinking the same. Hell; I replaced the plugs at 21,000 miles just because it was apart for Inspection I.

thekurgan · 08-26-2012, 09:15 PM

Yup, did the same with the plugs at 24k. Short of going with plasma coils *($$$$)* , just have to keep some on hand.

elerner61 · 08-27-2012, 05:08 PM

What is the maintenance interval/mileage for plug replacement for M's (no track time)? I think I'm going to replace all my coils soon and would do the plugs as well if it makes sense.

StickMon · 08-28-2012, 12:32 AM

I think inspection 2, which would be nominally 60k.
I've chosen to replace them on each valve adjustment, nominally 30k.
They have crush washer seals, not tapered seats, so you probably shouldn't take them out and then put them back.

thekurgan · 08-28-2012, 09:21 AM

Quote:

Originally Posted by StickMon

I think inspection 2, which would be nominally 60k.
I've chosen to replace them on each valve adjustment, nominally 30k.
They have crush washer seals, not tapered seats, so you probably shouldn't take them out and then put them back.

I believe this as well, if I'm pulling them, I'm replacing them. The good news is that the NGK and Denso iridium plugs are cheaper than the OEM two-prong plugs,and they can be gapped (carefully).

08-25-2012, 05:27 PM	#23
arobyte New Member 5 Rep 23 Posts Drives: 2006 BMW Z4 M Roadster Join Date: Feb 2009 Location: Ontario, Canada iTrader: (0)	Problem Fixed Yes it was coils. 3 of 6 coils were bad. Replaced and car drives amazing again. Thanks all for your input.
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08-25-2012, 06:18 PM	#24
Kgolf31 Brigadier General 460 Rep 4,531 Posts Drives: 2007 Z4MC, 2012 128i Join Date: Sep 2008 Location: Ohio iTrader: (4)	Looking back do you think it was smart to rev an engine running on 3 cylinders?
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08-25-2012, 06:43 PM	#25
Caddyshk M = Midlife Crisis 65 Rep 2,006 Posts Drives: 2006 Z4MC Interlagos Join Date: May 2007 Location: Fort Erie, Ontario, Canada iTrader: (0)	Interesting that 3 would go at the same time? __________________ 2006 Z4MC - #LL93158 SS Race Cans, RE X Pipe, DKF Sec 1, Fabspeed Headers, OE STB, AS Shifter, Dave Z CDV, GC Coil Overs, Stoptech lines, Hawk DTC Pads, RE Clutch Stop, RE Transmission Mounts, Vibra-Technics Engine Mounts, Poly FCAB & RTAB, LeatherZ M Shift Boot, Tekarbon Rear Spoiler, CF Grills, Advan RS DGM
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08-26-2012, 06:42 PM	#28
Caddyshk M = Midlife Crisis 65 Rep 2,006 Posts Drives: 2006 Z4MC Interlagos Join Date: May 2007 Location: Fort Erie, Ontario, Canada iTrader: (0)	Thinking the same. Hell; I replaced the plugs at 21,000 miles just because it was apart for Inspection I. __________________ 2006 Z4MC - #LL93158 SS Race Cans, RE X Pipe, DKF Sec 1, Fabspeed Headers, OE STB, AS Shifter, Dave Z CDV, GC Coil Overs, Stoptech lines, Hawk DTC Pads, RE Clutch Stop, RE Transmission Mounts, Vibra-Technics Engine Mounts, Poly FCAB & RTAB, LeatherZ M Shift Boot, Tekarbon Rear Spoiler, CF Grills, Advan RS DGM
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08-26-2012, 09:15 PM	#29
thekurgan Bad Lieutenant 233 Rep 3,517 Posts Drives: E90M3 Join Date: Aug 2007 Location: Sacramento iTrader: (0) Garage List 2008 BMW M3 [0.00]	Yup, did the same with the plugs at 24k. Short of going with plasma coils ($$$$) , just have to keep some on hand. __________________ 02 E39M5 \| TiAg/Schwartz \| Tubi Rumore \| Ultimate Ti Pedals \| E60 SSK \| Jim Blanton 3.45 40/100% \| Coby Alcantara \| StrongStrut STB
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08-27-2012, 05:08 PM	#30
elerner61 Major 157 Rep 1,107 Posts Drives: '07 Z4M Roadster Join Date: May 2011 Location: Mount Kisco, NY iTrader: (0)	What is the maintenance interval/mileage for plug replacement for M's (no track time)? I think I'm going to replace all my coils soon and would do the plugs as well if it makes sense.
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08-28-2012, 12:32 AM	#31
StickMon My other car is on Mars 636 Rep 3,124 Posts Drives: 2006 MR Join Date: Feb 2011 Location: Lo-Cal iTrader: (1)	I think inspection 2, which would be nominally 60k. I've chosen to replace them on each valve adjustment, nominally 30k. They have crush washer seals, not tapered seats, so you probably shouldn't take them out and then put them back.
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