MAYDAY! : C240 - engine barely runs after battery disconnect... - Page 2 - PeachParts Mercedes-Benz Forum

MwC · #16 02-22-2006, 06:57 AM

IT'S FIXED : IT WAS THE AIR MASS SENSOR !!!

YOU GUYS ARE GREAT !!!

I replaced the AMS and , voilà everything ok !

EPILOGUE : The air mass sensor has probably been deteriorating over the last couple months, asq witnessed by the increase in gas consumption, stumbling at idle and poor acceleration.

The system was correcting the failing AMS through the ECU software. When the battery was dis-connected, the memeory was lost, the standard reset values were too far off to keep the engine running.

Thanks to ALL who helped !

Arthur Dalton · #17 02-22-2006, 08:24 AM

Quote:

Originally Posted by MwC

IT'S FIXED : IT WAS THE AIR MASS SENSOR !!!

YOU GUYS ARE GREAT !!!

I replaced the AMS and , voilà everything ok !

EPILOGUE : The air mass sensor has probably been deteriorating over the last couple months, asq witnessed by the increase in gas consumption, stumbling at idle and poor acceleration.

The system was correcting the failing AMS through the ECU software. When the battery was dis-connected, the memeory was lost, the standard reset values were too far off to keep the engine running.

Thanks to ALL who helped !

SB thread was right on....

<< <<<

MABEASON · #18 02-22-2006, 08:32 PM

Do you have a check engine light on? if so what codes ?

MBTECH_GR · #19 02-23-2006, 10:23 AM

The fuel brain had adapted to a borderline maf meter. Those adaptations were reset with a disconnected battery.
You may have a bad maf meter. Driving the car may re-adapt.