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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > Service maintenance intervals vary



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      03-04-2014, 06:58 PM   #1
924er
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Service maintenance intervals vary

hello guys,

i was told today that my sparkplugs will be due in 2200 miles my car only has 30k miles. I know that 335s get plugs done at 45k per bmw manual but my SA told me it all depends on how you drive. is this true or are they bsin me? I know i been driving the car pretty hard recently but how would the ECU know how bad are the plugs worn?
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      03-04-2014, 07:02 PM   #2
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Well technically you can drive them til they're bad and misfiring, lol, not sure id wait that long though ofc. Yeah 45k seems to be a pretty fair guesstimate for the n54, if you're not having issues I wouldn't sweat it. If you like to stay on top of it you might start getting ready for it though.

Btw, 31k on my originals too. Buying my replacements but probably wont get em in til 40k.

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Originally Posted by 924er View Post
hello guys,

i was told today that my sparkplugs will be due in 2200 miles my car only has 30k miles. I know that 335s get plugs done at 45k per bmw manual but my SA told me it all depends on how you drive. is this true or are they bsin me? I know i been driving the car pretty hard recently but how would the ECU know how bad are the plugs worn?
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      03-04-2014, 07:05 PM   #3
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well i am getting misfires only when cobb is installed and i get on it hard but stock it doesnt misfire. i was gonna change the plugs myself but i guess ill wait, cant wait to have cobb back installed i miss those pulls
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      03-04-2014, 07:06 PM   #4
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Ok if you're tuned 30k is about what the average is. Weird that it doesnt do it when you take the COBB off. You'd think if the plug was bad it'd be bad no matter what. Maybe untuned it just doesn't stress it enough?

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well i am getting misfires only when cobb is installed and i get on it hard but stock it doesnt misfire. i was gonna change the plugs myself but i guess ill wait
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      03-04-2014, 07:06 PM   #5
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Btw, 31k on my originals too. Buying my replacements but probably wont get em in til 40k.
im guess your not tuned?
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      03-04-2014, 07:08 PM   #6
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Yeah , bone stock here. Never had a misfire.

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im guess your not tuned?
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      03-04-2014, 07:08 PM   #7
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Ok if you're tuned 30k is about what the average is but yeah that's weird that it doesnt do it when not tuned.
actually its not weird at all, cobb tells you sparkplugs tend to misfire more when the car is tuned vs it being stock because its a higher load the spark has to overcome.

im just asking if the car knows when to change the plugs depending on how hard the car was driven
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      03-04-2014, 07:09 PM   #8
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Yeah , bone stock here. Never had a misfire.
your not having enough fun lol

stock is fast, but tuned is sh**ng

but then you pay to play
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      03-04-2014, 07:09 PM   #9
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I've heard rumors that the ECU knows, i'd have to dig it up.. Smoething about how it can detect the gap wearing and it will adjust for it.

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actually its not weird at all, cobb tells you sparkplugs tend to misfire more when the car is tuned vs it being stock because its a higher load the spark has to overcome.

im just asking if the car knows when to change the plugs depending on how hard the car was driven
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      03-04-2014, 07:10 PM   #10
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It used to be 90k on the early ones. Reduced to 45k later. There is NO reason to change them earlier than 45k. That is why they are called stealerships.
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      03-04-2014, 07:10 PM   #11
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2 wks in it and im overwhelmed with the power lol. Gimme a bit. Getting some wheels and a few things first

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your not having enough fun lol

stock is fast, but tuned is sh**ng

but then you pay to play
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      03-04-2014, 07:30 PM   #12
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Plugs are due every 3rd oil change. Which per BMW if you follow to the T would be 45k
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