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#1
10-04-2007, 03:10 PM
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Sick of this! Fixed my power/mileage loss, and then it comes BACK
97 c230.....cleaned MAF, MAF has 60k on it 2 years after replacement. Car has 163k miles. Power and mileage came back 100% within 4 days of cleaning, and then a couple days ago I was under WOT from a stop and somewhere about 4000rpm, 1st gear, I felt a stumble. Power and mileage immediately back in the toilet. Like I hit a brick wall.
What gives?
__________________
former: 83 300D, 97 C230, 93 400E current: 08 C300 Luxury , 92 500SL 
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#2
10-04-2007, 04:00 PM
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Its a Benz. They need a lot of maintenance.
__________________
I got too many cars!! Insurance eats me alive. Dave 78 Corvette Stingray - 3k 82 242 Turbo Volvo - Manual - 270k 86 300e 5 speed manual - 210k 87 420sel - 240k 89 560sl - 78k 91 420sel - 205k 91 560sel - 85k 94 GMC Suburban - 90k 97 Harley Davidson Heritage Softail - 25k 00 GMC Silverado 1 ton 30k
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#3
10-04-2007, 04:17 PM
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Quote:
Any sugestions? MBDOC?
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former: 83 300D, 97 C230, 93 400E current: 08 C300 Luxury , 92 500SL
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#4
10-04-2007, 04:47 PM
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Most likely a mass air flow sensor failure.
Cleaning rarely fixes the sensor, only a temporary condition.
__________________
MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#5
10-04-2007, 04:58 PM
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Doc, you confirmed what my subconscious musings were trying to ignore.
A bit frustrating to only get 2 years out of the thing though.
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former: 83 300D, 97 C230, 93 400E current: 08 C300 Luxury , 92 500SL
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#6
10-04-2007, 07:05 PM
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I cleaned my MAF once and it only worked well for a few days before the stumble and poor mileage returned. I bought a new one and the problems were gone completely. I think cleaning just gives you a 50/50 chance of resolving the issue. In many cases you end up buying a new one anyway.
It's alright, just keep the old one in the trunk as a spare - they do occasionally go out completely, in which case your faulty sensor is better than none at all...
__________________
08 W251 R350 97 W210 E320 91 W124 300E 86 W126 560SEL 85 W126 380SE Silver 85 W126 380SE Cranberry 79 W123 250 78 W123 280E 75 W114 280
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