Long cranking when cold...

Stark7x · 11-13-2020, 03:35 PM

I just got my "new to me" 17 M4... Only has 3k miles. Been stored for most of its life. Anyway, When it sits for 2-3 days, it seems to crank too long to start...

Here's the video (iphone): https://photos.app.goo.gl/7DJw6QEyy1VsdgzF8

When it's warm, it's all fine. Cranks right up. It only happens when it sits for day or two...

It's definitely not the battery as I had it checked plus it's on CTEK charger for lithium batteries.
I had the dealer looked at it "we can't seem to find anything wrong with it. The fuel system checks out fine".

Another dealer, before i purchased it, changed the spark plugs (even though the mileage does not require it, but it was part of the maintenance thing)... so i'm wondering if maybe they didn't gap them right... but would it do this when cold?

It feels like a fuel/ignition issue where it doesn't just... "connect".

Any ideas?

bsmf8x · 11-13-2020, 04:41 PM

mine did this once (2016 stock m4) now that it's getting like 40 degrees F now but didn't think anything of it. Hasn't happened again

Stark7x · 11-13-2020, 05:11 PM

Quote:

Originally Posted by bsmf8x

mine did this once (2016 stock m4) now that it's getting like 40 degrees F now but didn't think anything of it. Hasn't happened again

Mine is also stock. No mods. Did it twice to me... only when cold starting.

Prossx · 11-14-2020, 11:31 PM

Clean your MAF, check idle control valve. That isn't right.

JamesF80m3 · 11-15-2020, 08:22 AM

Should not be that long. My car starts right up even when cold and on E85

Stark7x · 11-15-2020, 10:45 AM

I agree that it shouldn’t be that long and it clearly does not sound normal. With such low mileage I didn’t think maf or anything else would need cleaning... To me, it sounds like either an ignition (of some sort) or fuel delivery issue. No codes... so hard to know where to start.

zyce · 04-25-2021, 08:12 AM

Quote:

Originally Posted by Stark7x

I agree that it shouldn’t be that long and it clearly does not sound normal. With such low mileage I didn’t think maf or anything else would need cleaning... To me, it sounds like either an ignition (of some sort) or fuel delivery issue. No codes... so hard to know where to start.

Any update i had this happen 2 now ... Only on cold start ... Im stage 1 with downpipes and eventuri intake

Eurosonly · 04-25-2021, 12:29 PM

when I flashed the gts roar start onto my car this actually went away for me maybe you could try that not sure of anything tho.

zyce · 12-10-2021, 03:09 AM

Quote:

Originally Posted by Eurosonly

when I flashed the gts roar start onto my car this actually went away for me maybe you could try that not sure of anything tho.

Alright Will check that out

TopJimmy · 12-10-2021, 07:43 AM

I saw that you're stock, but it would be nice to have something like BM3 for logging that startup.

I've heard that when it starts getting cold outside that a little moisture can sometimes collect at the O2 sensors and throw them off. Soon as they heat up the moisture blows off and they run normal.

In this scenario I'd be watching the Lambda readings to see if they read weird on startup but normal soon after.

11-13-2020, 03:35 PM	#1
Stark7x Second Lieutenant 49 Rep 201 Posts Drives: Nothing, for now... Join Date: Oct 2011 Location: Clayton iTrader: (1)	Long cranking when cold... I just got my "new to me" 17 M4... Only has 3k miles. Been stored for most of its life. Anyway, When it sits for 2-3 days, it seems to crank too long to start... Here's the video (iphone): https://photos.app.goo.gl/7DJw6QEyy1VsdgzF8 When it's warm, it's all fine. Cranks right up. It only happens when it sits for day or two... It's definitely not the battery as I had it checked plus it's on CTEK charger for lithium batteries. I had the dealer looked at it "we can't seem to find anything wrong with it. The fuel system checks out fine". Another dealer, before i purchased it, changed the spark plugs (even though the mileage does not require it, but it was part of the maintenance thing)... so i'm wondering if maybe they didn't gap them right... but would it do this when cold? It feels like a fuel/ignition issue where it doesn't just... "connect". Any ideas? __________________ 2011 e92 M3 AW Stripper
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11-13-2020, 04:41 PM	#2
bsmf8x Lieutenant Colonel 779 Rep 1,636 Posts Drives: F82 Join Date: Jan 2020 Location: NY iTrader: (1)	mine did this once (2016 stock m4) now that it's getting like 40 degrees F now but didn't think anything of it. Hasn't happened again
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11-14-2020, 11:31 PM	#4
Prossx First Lieutenant 293 Rep 380 Posts Drives: 21 G82 6MT SPY/YMB Join Date: Feb 2015 Location: Kansas City iTrader: (0)	Clean your MAF, check idle control valve. That isn't right.
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11-15-2020, 08:22 AM	#5
JamesF80m3 Lieutenant 266 Rep 563 Posts Drives: F80 Join Date: Mar 2017 Location: New jersey iTrader: (1)	Should not be that long. My car starts right up even when cold and on E85
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11-15-2020, 10:45 AM	#6
Stark7x Second Lieutenant 49 Rep 201 Posts Drives: Nothing, for now... Join Date: Oct 2011 Location: Clayton iTrader: (1)	I agree that it shouldn’t be that long and it clearly does not sound normal. With such low mileage I didn’t think maf or anything else would need cleaning... To me, it sounds like either an ignition (of some sort) or fuel delivery issue. No codes... so hard to know where to start. __________________ 2011 e92 M3 AW Stripper
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04-25-2021, 12:29 PM	#8
Eurosonly car addicted 89 Rep 217 Posts Drives: 2015 m4 Join Date: Dec 2020 Location: portland iTrader: (0)	when I flashed the gts roar start onto my car this actually went away for me maybe you could try that not sure of anything tho.
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12-10-2021, 07:43 AM	#10
TopJimmy Major General 5508 Rep 5,187 Posts Drives: 2023 M3 Comp xDrive Join Date: Jul 2019 Location: Chester County, PA iTrader: (5)	I saw that you're stock, but it would be nice to have something like BM3 for logging that startup. I've heard that when it starts getting cold outside that a little moisture can sometimes collect at the O2 sensors and throw them off. Soon as they heat up the moisture blows off and they run normal. In this scenario I'd be watching the Lambda readings to see if they read weird on startup but normal soon after. __________________ '18 F80 Base 6MT \| '19 F82 Exec DCT \| '18 F82 Comp Exec DCT \| '23 G80cx
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