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Spark plugs
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OnlineBeemingallover
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Spark plugs
How many miles are spark plugs good for on a Z4M? Mine were last changed at 48k (insp 2), I'm now on 73k.
Z4MR 2006 Interlargos Blue/Sepang Bronze SUMMER
E92 M3 coupe manual 2009 Silverstone Blue WINTER
M635Csi 1986 manual Lachs silver. GONE.
E92 M3 coupe manual 2009 Silverstone Blue WINTER
M635Csi 1986 manual Lachs silver. GONE.
- srhutch
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Spark plugs
They are generally changed at inspection 2 time as the schedule dictates, which is approx every 50k.
Of course many will say you need to change boefre that time.
Of course many will say you need to change boefre that time.
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Spark plugs
I was getting occasional cylinder shutdowns due to misfire so changed the plugs as they were looking quite worn. This was about 15k kms before the inspection II was due (at around 90k kms), so if you have reason to it's definitely valid to change them earlier.
Current: 06 E85 M Silbergrau
Previous: E85 3.0si Silbergrau, 03 E85 2.5i Maldives Blue.
Mods: Gaptech OTH+R, Dension Gateway 300 with USB, CDV-, clear side indicators, euro tails, stubby, MFSW retrofit, OEM Bluetooth/VR
Previous: E85 3.0si Silbergrau, 03 E85 2.5i Maldives Blue.
Mods: Gaptech OTH+R, Dension Gateway 300 with USB, CDV-, clear side indicators, euro tails, stubby, MFSW retrofit, OEM Bluetooth/VR
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OnlineBeemingallover
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Spark plugs
Thanks. The car seems to perform well enough, though if the performance has deteriorated over a lengthy period it wouldn't be that noticeable. I recently had it on a dyno which indicated 307hp, as against BMW's factory output of 343hp. Whilst the factory figure might be overstated by BMW, I was advised that some loss was down to the friction of the good Michelin Pilot Sports, but also possible spark plug age.
Z4MR 2006 Interlargos Blue/Sepang Bronze SUMMER
E92 M3 coupe manual 2009 Silverstone Blue WINTER
M635Csi 1986 manual Lachs silver. GONE.
E92 M3 coupe manual 2009 Silverstone Blue WINTER
M635Csi 1986 manual Lachs silver. GONE.
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Spark plugs
It's quick and easy to pull one and inspect it - mine were noticeably deteriorated. I'd do this before replacing.
Current: 06 E85 M Silbergrau
Previous: E85 3.0si Silbergrau, 03 E85 2.5i Maldives Blue.
Mods: Gaptech OTH+R, Dension Gateway 300 with USB, CDV-, clear side indicators, euro tails, stubby, MFSW retrofit, OEM Bluetooth/VR
Previous: E85 3.0si Silbergrau, 03 E85 2.5i Maldives Blue.
Mods: Gaptech OTH+R, Dension Gateway 300 with USB, CDV-, clear side indicators, euro tails, stubby, MFSW retrofit, OEM Bluetooth/VR
- Ewazix
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Spark plugs
Mentioning tyres as a possible drain on the figure suggests your 307 was at the rear wheels? I thought the factory 343 figure was 'at the flywheel', the loss to the wheels is usually rated at about -15% which wouldn't be far off the figure you had.Beemingallover wrote: ↑Sun Aug 26, 2018 9:22 am Thanks. The car seems to perform well enough, though if the performance has deteriorated over a lengthy period it wouldn't be that noticeable. I recently had it on a dyno which indicated 307hp, as against BMW's factory output of 343hp. Whilst the factory figure might be overstated by BMW, I was advised that some loss was down to the friction of the good Michelin Pilot Sports, but also possible spark plug age.
TBH plugs within their service age/mileage either work fine or fail under load which is generally quite noticeable somewhere in the rev range or show up on a real-time diagnostic.
2003 2.5 SE, low miles, Sterling Grey, 108's & Eagles, no stubby here! Unmolested.
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OnlineBeemingallover
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Spark plugs
Ewazix, Yes 343 at flywheel but dyno guys seem to suggest the 307 at the wheels maybe could be a bit better, I pushed them on that and they said a change of plugs would help if the plugs were old.
Z4MR 2006 Interlargos Blue/Sepang Bronze SUMMER
E92 M3 coupe manual 2009 Silverstone Blue WINTER
M635Csi 1986 manual Lachs silver. GONE.
E92 M3 coupe manual 2009 Silverstone Blue WINTER
M635Csi 1986 manual Lachs silver. GONE.
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Spark plugs
If you got 307 at the wheels I’d leave it all alone ! That’s a very good number , as you generally loose 50-70bhp from fly to wheels
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OnlineBeemingallover
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- Joined: Tue Jul 29, 2014 9:47 am
Spark plugs
Bodyboarder, Yes, thinking now I mustn't get greedy.
Z4MR 2006 Interlargos Blue/Sepang Bronze SUMMER
E92 M3 coupe manual 2009 Silverstone Blue WINTER
M635Csi 1986 manual Lachs silver. GONE.
E92 M3 coupe manual 2009 Silverstone Blue WINTER
M635Csi 1986 manual Lachs silver. GONE.