Fuel consumption... low power at low rpms
09-20-2018, 08:25 AM
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E500
Fuel consumption... low power at low rpms
2003 e500. 140000 miles. New air filters, spark plugs and wires. Cleaned rhe maf.
average about 17 mpg.
Around 1700-2200 rpms there is a power dip.
measured fuel trims,
LTFT on both banks stays around +10.2 as a base line at low rpms or low engine load. STFT varies around +4 at highest.
Fuel trims return to normal readings when higher rpms and engine load increases.
im thinking vacuum leak but im new to this car. Input from you guys would be much appreciated.
average about 17 mpg.
Around 1700-2200 rpms there is a power dip.
measured fuel trims,
LTFT on both banks stays around +10.2 as a base line at low rpms or low engine load. STFT varies around +4 at highest.
Fuel trims return to normal readings when higher rpms and engine load increases.
im thinking vacuum leak but im new to this car. Input from you guys would be much appreciated.
09-20-2018, 10:24 AM
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2010 E63 AMG, 2003 E500
Sometimes the MAFs are bad and can't be restored to proper working order with just cleaning. I sprayed mine with cleaner when I first got the car used with 86k miles. After a year and a half and another 20k miles my MAF eventually went bad and threw error codes. Replaced it with a new one and the car's been fine ever since.
09-22-2018, 04:17 PM
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Sometimes the MAFs are bad and can't be restored to proper working order with just cleaning. I sprayed mine with cleaner when I first got the car used with 86k miles. After a year and a half and another 20k miles my MAF eventually went bad and threw error codes. Replaced it with a new one and the car's been fine ever since.
I cleaned the maf again and the ltft went down to about 7 for a day or two but its back up to 10 now. I injected some propane into the intake and the slight rumble and small random misfires seemed to smoothen out when applied.
