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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > UK Technical Forum > Finally car sorted, but worrying oil on spark plugs



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      07-08-2013, 11:44 AM   #1
Yoro35i
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Finally car sorted, but worrying oil on spark plugs

So after changing

HPFP
Low pressure fuel sensor
vano's
Solenoids

and 6 x new spark plugs and one Coil pack on cylinder 4.

Finally the car is back to healthy. No more rough idle,weak start up etc

My mechanic gave me back my old spark plugs , 4 of them looks to be good condition and 2 of them have lots of carbon build up and oil residue on the plug thread!

plugs are 30k tuned miles and lasted a 5000km europe trip. did i change some too early?

should i worry about anything? what do you guys think this is? leaky injectors?? or oil gasket is leaking oil onto it??





I think its most likely its a leaking oil gastket on the top of the engine sipping oil onto the plug?

cheers for any input
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Last edited by Yoro35i; 07-08-2013 at 11:50 AM.
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      07-08-2013, 11:55 AM   #2
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I would say injectors. Black sooty plugs signals mixture is too rich.
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      07-08-2013, 12:11 PM   #3
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they look fooked! mine ones were "cleaner" and it looks like mine is running lean.
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      07-08-2013, 12:17 PM   #4
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Quote:
Originally Posted by zltm089 View Post
they look fooked! mine ones were "cleaner" and it looks like mine is running lean.
your car was running stock, mine was running stage 1+ in all its like =]

you will know when you change next time haha
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      07-08-2013, 12:28 PM   #5
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Quote:
Originally Posted by John320d View Post
I would say injectors. Black sooty plugs signals mixture is too rich.
Dammn, now thats not good to hear.. lets see what other guys think first..
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      07-08-2013, 12:51 PM   #6
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oil on threads is possibly the valve cover gasket.

Black plugs = running rich = possible leaky injectors
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      07-08-2013, 02:25 PM   #7
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Damn..now i need to put the cobb back on to see if there is anymore problem.

I duno how to find which injector needs replacing now =(
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      07-08-2013, 02:30 PM   #8
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Quote:
Originally Posted by Yoro35i View Post
I duno how to find which injector needs replacing now =(
Take your plugs out one by one (yes, the new ones will already be black) to see which cylinders are running rich.
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      07-08-2013, 03:07 PM   #9
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sigh...guess its another trip to the dealer...
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