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#1
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OLD PLUGS look ok?
I removed and buffed them clean. Then after a about a hundred miles I replaced them. But they had this odd yellowish/gold coating on the prongs and part of the ceramic that encases the diode. Is this normal? Is this a sign of antifreeze leaking into combustion chamber? Curious. J
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X5 3.0 AUTO -2001 - 238,000 miles Last edited by Bmwtvboy; 11-06-2020 at 02:50 PM. |
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#2
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It's normal for the plugs to discolor. Plugs look close to normal, a little on the rich side. Pictures don't always show true color but I would not be concerned.
Is the reason you are asking about leaking coolant because the engine is missing, you are losing coolant, or there is an indication of coolant in the oil?
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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior Dallas |
#3
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The only way to inspect plugs are to view them under a magnifying lupe. Reading plugs is like reading fresh snow, the top is all you can see.
With that said, The images you provided show normal plugs that show stop and go driving cycles. If you want to properly see how plugs provide a view into engine health/performance, install a new set, take the car out for a 30-50 highway speed drive, pull over and remove one front and one rear plug and view. On straight 6 cyl engines, you will find the plugs will show variable images of running condition based on their position in the head. front ones will run cooler and the rear plugs will run hotter due to engine wash (air flow).plug center electrodes will wear faster on the ones closer to the fire wall due to temps of the combustion chambers. Suggestions: clean the throttle body plate, inspect the intake boots, and make sure you run a few tanks of quality gas with some injection cleaner. Other than normal prevention steps you are good to go. Be aware that the early X5 have short plus wires that need to be replaced every 60-80k on plug changes.
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2005 X5 4.8IS The Blue ones are always FASTER.... Current Garage: 2005 X5 4.8is 2002 M5 TiSilver 2003 525iT 1998 528i Former Garage Stable Highlights 2004 325XiT Sport 1973 De Tomaso Pantera, L Model 1970 Dodge Challenger T/A 4 sp Alpine White 1970 Dodge Challenger T/A 4 sp GoManGo Green 1971 Dart Sport, “Dart Light” package 1969 Road Runner 383 1968 Ply Barracuda 340S FB Sea-foam Green |
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