How long for engine to cool to change plug

3rdCoastBMW · 07-13-2017, 01:09 PM

I had a misfire on the work to work this morning. I have to drive it back to my house tonight and I will be fully cooking under the hood by the time I get there.

Assuming I leave my hood open, how long should I wait to change a plug out. I don't have a fan or anything to help cool the engine and its hot as fck here in Texas.

Hopefully its just a coil pack, but I figured I would ask now just in case.

335e92tx · 07-13-2017, 04:40 PM

Id at least make sure the temp gauge was back on the peg. Good way to foul up threads on an alum head by backing a plug out when hot.. if its warm to the touch.. it can have an effect.

Sat morn?

MysticRob · 07-13-2017, 04:45 PM

I've always done plugs when engine is cold and never had a problem, aluminum or otherwise. No sense sweating over a hot engine if I don't need to.

Boland01 · 07-14-2017, 09:19 AM

I live in Houston. First leave the hood open and take off the engine cover. That will speed the cooling a bit. For sure overnight it will cool completely. If you're in a hurry then at least a few hours. These engines get and stay hot forever!

R.G. · 07-16-2017, 09:22 PM

Until it doesn't scold you. Or just wear gloves.

LGCubana · 07-16-2017, 10:25 PM

I default to the Ralph Wiggum scale.

Somewhere between 1 & 2 Ow-eee-s

07-13-2017, 01:09 PM	#1
3rdCoastBMW New Member 18 Rep 27 Posts Drives: 2014 F06 M6 Join Date: Jun 2017 Location: Houston iTrader: (0)	How long for engine to cool to change plug I had a misfire on the work to work this morning. I have to drive it back to my house tonight and I will be fully cooking under the hood by the time I get there. Assuming I leave my hood open, how long should I wait to change a plug out. I don't have a fan or anything to help cool the engine and its hot as fck here in Texas. Hopefully its just a coil pack, but I figured I would ask now just in case.
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07-13-2017, 04:40 PM	#2
335e92tx ahat 1073 Rep 2,592 Posts Drives: Was '07-335e92 - Now '13-335IS Join Date: Mar 2008 Location: Texas iTrader: (6)	Id at least make sure the temp gauge was back on the peg. Good way to foul up threads on an alum head by backing a plug out when hot.. if its warm to the touch.. it can have an effect. Sat morn? __________________ '13 335IS N54 (1 of 373 LeMans Blue out of 3597 total production e92)- Grey interior (1 of 24 in LMB with any trans- 1 of 14 with DCT)-MODS -MFactory LSD/MHD-BQ custom Tune/ATM-IC/AFE Momentum GT Intake/Konis/Mfront&HeimJoint Rear rods&arms/Brembos. https://photos.app.goo.gl/Lo6aHZRo7XqtPkhL8
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07-13-2017, 04:45 PM	#3
MysticRob Captain 573 Rep 870 Posts Drives: 2009 335i E90 Join Date: Jan 2017 Location: Fremont, CA iTrader: (0) Garage List 2009 BMW 335i E90 S ... [10.00]	I've always done plugs when engine is cold and never had a problem, aluminum or otherwise. No sense sweating over a hot engine if I don't need to. __________________ 2008 E61 535xi Sport Wagon / 100k Miles / Deep Sea Blue Metallic / Natural Brown Interior / MHD Stage 1 91 CA-Octane Tune. SOLD - 2009 E90 335i M-Sport Sedan / 143k Miles / Alpine White Exterior / Chestnut Brown Interior / Mishimoto FMIC / xHP Stage 2.
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07-14-2017, 09:19 AM	#4
Boland01 Lieutenant 152 Rep 460 Posts Drives: 2010 535ix, 2008, 2007 335i Join Date: Sep 2013 Location: Magnolia, TX iTrader: (0)	I live in Houston. First leave the hood open and take off the engine cover. That will speed the cooling a bit. For sure overnight it will cool completely. If you're in a hurry then at least a few hours. These engines get and stay hot forever!
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07-16-2017, 09:22 PM	#5
R.G. Captain 236 Rep 885 Posts Drives: Isetta Join Date: Jan 2013 Location: In my sub conscious iTrader: (12)	Until it doesn't scold you. Or just wear gloves. __________________ DocRace 6266 E92. M8 comp coupe, X5m
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