Dangers of a Throttle Body Reset - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 06-13-2009, 01:54 AM Thread Starter
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Dangers of a Throttle Body Reset

Following on from my problems detailed here:


The well known throttle body reset procedure was the cause of my ignition problems.

Luckily it cleared itself this morning and the car is starting fine. The mechanic said that the problem arose from the throttle body reset in that the throttle body was not intermixing fuel and air in the correct ratio to achieve a consistant idle rev level. It will eventually get back up to the correct levels after several starts but the initial ignition start will invariably fail and you will have to keep trying.

Has anyone else had the same problem?
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post #2 of 3 (permalink) Old 06-13-2009, 06:03 PM Thread Starter
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Ok, problem came back this evening.

I disconnected the battery for an hour just to make sure that the Throttle body had reset. When I reconnected the battery, it started up perfectly three times in a row.

Anyway, this evening it stalled again on initial ignition. Revs hit 700rpm then immediately dropped and died. Turning the key again without removing it starts the car up fine albeit it seems to struggle to get over 700rpm, drops to near zero before coming back up, settling at the 700rpm mark for a consistent idle. It's as if it is searching for the correct idle level. When I take the key out and restart, it dies again.

I did have the MAF sensor replaced yesterday. Could this have something to do with it? When it does start, the car is driving spectacularly. Could this be an electronic/software problem with the throttle body or something physical? Could it be the key? I'm going to try again with the spare key.

Your collective wisdom please...
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post #3 of 3 (permalink) Old 06-24-2009, 11:33 AM Thread Starter
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Update on this. Problem is now sorted. The MAF sensor the mechanic used was a Bosch one which had compatibility issues with the throttle body settings. A genuine Mercedes one was installed and the car now starts perfectly.

The moral of this story is always use genuine parts.
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