Clean MAF, new o2 sensor: still weak idle - Page 2 - Mercedes-Benz Forum

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post #11 of 14 (permalink) Old 07-09-2013, 05:49 AM
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Originally Posted by kentstjohn View Post
Received the MAF. Replaced it. Still feeling a funky idle. The feeling is so subtle, I'm starting to think I'm psyching myself out... but it's there.

Before I return the MAF I just ordered, is there a way to test my old one with an Ohm reader, just to confirm that it is still good and conducts correctly? Is that even possible?

Also, should my next step be to replace the rear o2 sensor on the right side (already replaced the front one), or should I just take it back to the shop for them to run more diagnostics?
Not to get too hung up on the MAF, how old are the spark plugs, when were the injectors cleaned last, how old is the fuel filter?

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post #12 of 14 (permalink) Old 07-09-2013, 10:12 AM Thread Starter
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Originally Posted by flyboyike View Post
Not to get too hung up on the MAF, how old are the spark plugs, when were the injectors cleaned last, how old is the fuel filter?
Spark plugs are brand new as well as injectors. Fuel filter I'm not sure of. I've never changed it. Is it easy to replace? Any thoughts on whether the shops diagnostics would pull up some codes? I want to stop guessing and buying parts, and instead figure out exactly what's up.
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post #13 of 14 (permalink) Old 07-09-2013, 01:57 PM
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11 years is a mighty long time to run a fuel filter.

As far as codes go, lots of them can be stored and the CEL may not light up. You won't know until you have the car scanned.
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post #14 of 14 (permalink) Old 07-09-2013, 02:06 PM Thread Starter
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Ok. I'll probably take it back into the shop to have it scanned by a legit computer. I've only used the generic scanners from O'Reilly's, so I'm guessing that doesn't pick everything up?
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