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2003 SL350
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2 Posts
Discussion Starter #1
Hi
Any suggestions on cause of SL350 stalling at or limping away from a stop once fully warm? Tends not to happen on shorter runs and doesn't always happen on longer runs either - not very helpful for diagnosis! Seems to be more frequent in hot weather. Can make pulling out of junctions or roundabouts interesting. If it doesn't stall, it limps along running very uneven and with no power. Gentle tickling of the throttle keeps it going, while a firmer push tends to finish it off or achieve nothing. Used to cause engine management light to come on, but it doesn't seem to do that now. Apart from these low-rev situations, it runs perfectly.
Diagnostics have indicated either nothing or a misfire. Garage suggested replacement plugs and leads but made no difference. They are suggesting another oil change thinking that might clear hydraulic tappets - valid or nonsense?
Any help would be fantastic,
Thanks,
Peter
 

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2005 SL500 black
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215 Posts
It's really hard to tell, SDS gives any codes?

Could be any of those:
MAF sensor dirty or air leaking in engine tubes? spray MAF with cleaner or even replace it, check for air leaks around it and in rubber tubes on top of engine and replace what's cracked (it worked for someone in the forums)

CPS sensor? Replacing it worked for some others

Defective EIS? some people have had success after doing this (expensive and can only be done at dealership, I did it and it didn't change things for me)

My problem with stalling and misfires just went away, maybe it has to do with my most recent oil change or MAF (which I got lazy about cleaning) all the sudden getting less dusty inside.

My 2 cents
 

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2003 SL350
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2 Posts
Discussion Starter #3
Thanks for that.
Car actually belongs to a friend, so I'm not sure about SDS giving any codes. I will check.
I wondered if it was an issue with air intake - so interesting you should suggest MAF sensor, but that is as far as I would have got.
Thanks.
 

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3 Posts
mine went into limp mode due to the crank shaft sensor needing changing - will only show on sophisticated diagnostic not Aldi £16 one ! had orange engine light on beforehand and limp mode happened when the engine got hot only
 

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2003 SL55; 2011 E350 BTC
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443 Posts
Limp mode in my SL55 only happened with a bad throttle pedal. See if you can trigger it by mashing the throttle.
 
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