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NGK R2525-10 plugs die after 2 hours of idle

 
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TwinTurboM3



Joined: 21 Mar 2008
Posts: 535

PostPosted: Fri Oct 25, 2013 10:21 am    Post subject: NGK R2525-10 plugs die after 2 hours of idle Reply with quote

Been on NGK R2525-10 for the summer w/o issues.

Now its 51 F, and the plugs die by just 2 hours of idle.

No passes no nitrous and NGK R2525-10 die after very short time, engine does not start.

Put a new set of R2525-10 and after two hours of idle or soft drive plugs die.

Could it be that -10 heat range plugs do not like to work under 51 F ambient or the plugs are damaged from factory?

I lost 2 full days trying to diagnose the not starting issue, changed fuel injectors, sensors, ecu, coils etc, and did not know that the brand new plugs would give up after 2 hours of idle or soft drive.
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XM3 all wheel drive M3 twin 6266

0-60 mph 1,8 sec @ low boost
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baldur



Joined: 12 Oct 2007
Posts: 623
Location: Reykjavik, Iceland

PostPosted: Fri Oct 25, 2013 4:46 pm    Post subject: Reply with quote

-10 heat range plugs do need quite a bit of load to stay in the temperature range that keeps them clean of carbon. They are racing plugs.
have you tested the dead plugs out of the engine to see if spark still forms or if they're shorted out or what?
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Baldur Gislason
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Pantera EFI



Joined: 12 Feb 2005
Posts: 1718
Location: So. California

PostPosted: Sat Oct 26, 2013 8:01 am    Post subject: Sparkplug Heat Range Reply with quote

Hi Mert, your plugs did NOT die.
Clean them with Glass Bead media.
Your sparkplugs became carbon fowled.

The heat range test is on a hot engine/full load.
Examine the insulator for the carbon band location.
That location should be between the middle AND deep end, just past the curve.

Your troubles may better explained by a poor "warm-up" tune/idle tune.

One MAJOR benefit of a well tuned EFI system is the ability to run cold plugs year round.

Lance
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