Question about 2000 Hyundai Elantra

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Car will not rev up but idles fine It bog out as u depress the gas pedal. the codes are vss and maf low input I replaced the maf sensor but no change fuel filter is good fuel pump is working not sure what to do. any info would help thanks

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You need a scan put on it to check the values of the maf or vss also scan out maf volts at idle 0.7-1.1 and at 3000rpm 1.3-2.0 if out of spec check for 5v at main in if not 5 check ecu.also check air filter is dirty.

Posted on Jul 13, 2010

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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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Have you tried cleaning the MAF sensor. This sensor is by the air filter box. The mass air flow sensor has to be cleaned with a special spray that you can get at any auto parts store. Do not, I repeat do not use carb cleaner this will ruin it. It is basically a thin filament housed in a grid where the air flow goes through and if it gets coated by dust, oil, or burning to rich black soot this will throw the signal off just enough at the computer.

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