kickdown on my ML320 goes into limp type mode - Page 2 - Mercedes-Benz Forum

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post #11 of 14 (permalink) Old 11-13-2007, 02:50 PM
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Originally Posted by davbro View Post
Guys, my ML is now running sweet. It was the airflow meter sensor. My specialist also replaced the airflow meter itself for good measure. £220 done including a full diag print out and extensive test drive by a merc qualified engineer. Mercedes wanted more than that just to look at it!! All the best. Dave
Good if it got fixed. MAF malfunction is I guess the most common cause for limp home mode, the fact that it only appeared to occur at kick down perhaps made no one suggest it could be the MAF.
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post #12 of 14 (permalink) Old 11-13-2007, 10:28 PM
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i worked on a ml5oo that kept me guessing what the hell the problem was because the trouble codes kept pointing me in the direction of the pedal sensor, but when i checked the fuel trim and the mass air flow sensor, the voltage was off and the fuel trim was off. when i asked my teacher how common it was to have a mass air flow sensor go bad on a ml, he said it does happen every now and then.

it was funny when i did a test drive to verify the complaint, i could floor the pedal and it would just sit at 1k rpms and wouldn't get and go for a good 5-6 seconds. after we swapped out the mass air flow sensor, ml ran real good.
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post #13 of 14 (permalink) Old 11-15-2007, 03:12 AM
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Originally Posted by davbro View Post
Hi guys, my Ml is with a merc specialist tomorrow. On the phone he diagnoses it straight away as a sensor on the throttle or clutch, £40 to do a full plug in and update and then if its a sensor £100 max, bargain. Mercedes Uk in Loughborough, wanted £300 to change the gearbox oil and refused to plug it in first as "that is the problem sir, no doubt at all". Always nice to know the main dealers look after there customers!!!!!!!! Will add update tomorrow with full diagnosis.
I have had similar probs with my CLK320, Had the mass air flow meter changed & brake pedal sensor (this came up as a fault when plugged in) work was done by independant not MB. Did the mass ir flow meter you had replaced need to be remapped to the management system. I still get the antiskid/BAS alarms come after a few miles on the road but they reset when engine turned off a nd back on then she purrs along till the next time normally after a couple of hundred miles or so. Dam frustrating
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post #14 of 14 (permalink) Old 11-15-2007, 05:19 AM Thread Starter
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Hi, No, the air flow meter is completely program free, the mapping of the car will adjust according to it. my guy says there is nothing he do or change it or how the car talks to it. It has completely curred my problem, the ML is now very smooth, quiet and goes like a bat out of hell when u need it too. If you still getting warning lights try getting your guys to clear all the stored faults in the ECU, as if it has old ones they may reappear randomly.... so im told anyway. My ML had fault codes from 3 years ago in it regardin the rear boot latch not securing correctly, funnily enough the button on the remote never worked for it until my guy emptied the store codes. Best Wishes. Dave
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