Question about 1991 Mercedes-Benz Mercedes Benz Sl Class

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Boging i bhave a 91 SL 300 i have replaced both fuel pumps,persure regulater, plate senor, and it idles great but press the pedel it bogs and i let up it's runs great but it keeps boging

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  • boxco4 May 20, 2009

    i don't have a mas air flow . i have the senor that located on side the fuel distributor and it has being replaced

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  • 117 Answers

Hello there

Sounds like the MAF (Mass Air Flow) sensor which also gives similar problems.


Hope this helps, please don't forget to rate me.

Posted on May 20, 2009

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3 Answers

Car idles fine, but sputters, bogs and dies if gas pedal is pressed.


new spark plugs this decade. (a tune up?0
the filter is part of all 60k tuneups. letting it clog wrecks good pumps.
my wild guess, its lack of fuel flow, do to old filter.
or low fuel pressure.
car is identical to a Corolla. so is not unique or rare as some Geo cars are.
the cam belt not changes, invites valve kissing piston tops. BOOM
end of engine. (costs more to fix then worth of car)
the word is bogging, my engine bogs
if if bogs WOT (wide open throttle) and dont catch up < ITS NOT THE TPS. ever.
tps bad causes short bogs, called hesitations.
The map sensor , is what measure air flow and the ECU matches fuel to this air flow.
my guess, is it does that, but fuel pressure is like 15PSI, bad.

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The ECM maybe stuck, disconnect the battery and wait 5 mins then reconnect.

Other things that normal cause high rpm at idle:
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1 Answer

No power under acceleration , it starts good idles good then when you drive it ,it bogs down like its starving for gas. i replaced fuel pump , fuel filter,fuel regulater,map sensor


Two possible issues. One, Your mass airflow sensor could be unplugged, dirty, or malfunctioning. Two, you could have a clogged catalytic converter. There are cleaners you can use, but generally you need to replace the catalytic converters.

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You could possibly turn up the idle if it bogs down when idling. If it only bogs down when you press the gas it may be a clogged fuel filter or fuel line. Could also be your fuel pump starting to go if you ride with less than a quarter of a tank of gas most of the time.

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