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#1
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Sudden drop in gas mileage.
O2 sensor has only close to 11,XXX miles on it. Spark plugs are about the same as well as air filter. No CEL code. Nothing was tampered with. Fuel/Air mixture is as it was when car came from the factory. I usualy would get anywhere from 280-300 miles on a full tank of gas (city and highway respectively) now I only get 240 miles city. Any suggestions
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![]() 1990 190E 3.0L |
#2
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Any loss in power? hesitation? missing?
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Eugene 10 E63 AMG 93 300te 4matic 07 BMW X3 14 Ford F-150 Fx2 |
#3
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no loss in power, no hesitation, no stuttering or misfiring.
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![]() 1990 190E 3.0L |
#4
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winter gasoline,more alcohol? If temps changed because of winter its normal
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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt |
#5
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Rarely get winter get here.....temp is usually mid 60s to 70s during winter months
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![]() 1990 190E 3.0L |
#6
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Quote:
Id check the duty cycle to see if it goes in to closed loop. Also, check you vacuum to make sure you have not sprung a leak. Obviously duty should be around 55%, Vacuum should be roughly 15hg. 13hg is minimum.
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Eugene 10 E63 AMG 93 300te 4matic 07 BMW X3 14 Ford F-150 Fx2 |
#7
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Ismalley, pull the distributor cap and check the condition of the terminals and the rotor ... also, look for any tracking inside the cap. Verify that all ignition wires are securely fastened to the distributor cap and spark plugs.
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Fred Hoelzle |
#8
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He states no misfires,or hesitation, so I doubt that would help.
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Eugene 10 E63 AMG 93 300te 4matic 07 BMW X3 14 Ford F-150 Fx2 |
#9
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Ismalley, purchase gas from a different source and see if your gas mileage improves.
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Fred Hoelzle |
#10
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I don't think you can get an accurate mileage reading from just one tank. Realistically, one should fill up and note the mileage. Then record the gas used over the next few fill ups. Then fill it up to the top and note the mileage. This way, you even out all of the possible problems with a single filling.
Anziani, '93 E420 128K '97 S500 coupe, 135K |
#11
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I agree - I keep a log book and write down every fill-up. It could just be that you didn't get the tank full last time you gassed up.
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Robert Fini '12 ML350 BlueTec, 100k '06 E320CDI (x2) '05 T1N Sprinter 2500/Pleasure-Way Plateau TS, 70k '97 C36AMG, 319k (son's) '94 E320T, 249k '93 190E Sportline LE, 168k (daughter's) '84 190E-2.3/5spd (Stage Rally Racer) '66 230 W110 Sedan (Barn Find, Vintage Racer build in progress) |
#12
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He said in the first post he usually gets 280-300 per tank, now he got 240. By reading that one would assume he keeps track of fill ups.
Are you guys posting just to increase your post count?
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Eugene 10 E63 AMG 93 300te 4matic 07 BMW X3 14 Ford F-150 Fx2 |
#13
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The point is that he shouldn't panic and go tearing into the car based on the results from one tankful, but thanks anyway for your helpfulness...
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Robert Fini '12 ML350 BlueTec, 100k '06 E320CDI (x2) '05 T1N Sprinter 2500/Pleasure-Way Plateau TS, 70k '97 C36AMG, 319k (son's) '94 E320T, 249k '93 190E Sportline LE, 168k (daughter's) '84 190E-2.3/5spd (Stage Rally Racer) '66 230 W110 Sedan (Barn Find, Vintage Racer build in progress) |
#14
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Quote:
If the vacuum and duty cycle check out,(free to check) then I would say it could be a bad tank of gas.
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Eugene 10 E63 AMG 93 300te 4matic 07 BMW X3 14 Ford F-150 Fx2 |
#15
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Quote:
Give or take 1/2 gallon is more reasonable on a fill-up.
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Eugene 10 E63 AMG 93 300te 4matic 07 BMW X3 14 Ford F-150 Fx2 |
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