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SL-Class (R230) 2003 -- 2012: Discussion on the SL500, SL550, SL600

SL/R230: Sometimes engine dies

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Old Apr 16, 2020 | 05:27 AM
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starfighter's Avatar
starfighter
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From: Faqirhope, Alabama
r230
Sometimes engine dies
2005 sl500
vehicle runs great......BUT..
every so often after running at speed, I stop for a traffic light and engine stumbles and sometimes dies.
doesn't happen every time, but often.
bad fuel ?
Appreciate any thoughts.
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Old Apr 16, 2020 | 08:56 AM
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From: Walpole, MA USA
2004 SL500
There should be an error logged, no? Do you have an OBD2 reader?
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Old Apr 16, 2020 | 09:09 AM
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yes, everything is logged and remains until battery is disconnect for a while
you need to run a proper diagnostic asap
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Old Apr 16, 2020 | 09:13 AM
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From: Faqirhope, Alabama
r230
No error message
I'll try hooking up my Foxwell
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Old Apr 16, 2020 | 09:19 AM
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Originally Posted by starfighter
I'll try hooking up my Foxwell
if you have a mess of fault codes in there, delete all, then on the next fail, immediately run that foxwell thing. that way you have a focused fault result
good luck !
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Old Apr 16, 2020 | 09:35 AM
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From: Faqirhope, Alabama
r230
No error message
Checked with my Foxwell
no fault codes...
was 1 relating to rear power supply and was an old one
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Old Apr 16, 2020 | 09:37 AM
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Originally Posted by starfighter
Checked with my Foxwell
no fault codes...
was 1 relating to rear power supply and was an old one
start checking your batteries then, and alternator
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Old Apr 16, 2020 | 09:42 AM
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2008 SL55AMG
Could it be Crank Shaft Sensor ?
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Old Apr 16, 2020 | 09:46 AM
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Doesn't do it every time...
If it was an older vehicle I'd say a bad dashpot..
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Old Apr 16, 2020 | 10:24 AM
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SL500, Miata
It's easy to think of causes for an engine shutting off unexpectedly. In this case you need to consider which ones correlate with the particular circumstances. For me, there simply isn't enough detail in the first post.
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Old Apr 16, 2020 | 02:01 PM
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From: Faqirhope, Alabama
r230
Foumd


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Old Apr 16, 2020 | 02:02 PM
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r230
Found it
Air cleaner cover was loose
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Old Apr 16, 2020 | 02:11 PM
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Originally Posted by starfighter
Air cleaner cover was loose
lool

I sometimes forget to fasten the turbo intercoolers hose, first acceleration, bang it pops
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Old Apr 16, 2020 | 10:12 PM
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From: Walpole, MA USA
2004 SL500
Originally Posted by starfighter
Air cleaner cover was loose
That confuses me. The air cleaner cover is the engine cover. Even if it's loose, air is able to enter the intake, just possibly dirty. How does that shut down the engine?
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Old Apr 17, 2020 | 06:58 AM
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From: Faqirhope, Alabama
r230
Mass air
Sliding around sending different amounts of air to the mass air sensor.......but whatever.
properly reinstalling the cover fixed the problem........
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