Fuel Efficiency Losses?
Thread Starter
Super Member
Joined: May 2005
Posts: 558
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From: New York City
2000 CLK 430
Fuel Efficiency Losses?
Besides a dirty air filter... what else would contribute to a loss in MPG?
Lately I have been watchin the needle of my gas tank drop... anyone have any input?
Fuel filter perhaps?
I dont have a fuel leak thats for sure... thanks for the help
PS - when I took out my air filters to be cleaned (k&n)... one air filter was visually, dirtier than the other.... whats up with that ?
Lately I have been watchin the needle of my gas tank drop... anyone have any input?
Fuel filter perhaps?
I dont have a fuel leak thats for sure... thanks for the help
PS - when I took out my air filters to be cleaned (k&n)... one air filter was visually, dirtier than the other.... whats up with that ?
Last edited by wnycec; Nov 15, 2005 at 06:44 PM.
MBWorld Fanatic!
Joined: Jun 2004
Posts: 1,880
Likes: 9
From: Seattle
05 E55
Originally Posted by wnycec
Besides a dirty air filter... what else would contribute to a loss in MPG?
Lately I have been watchin the needle of my gas tank drop... anyone have any input?
Fuel filter perhaps?
I dont have a fuel leak thats for sure... thanks for the help
PS - when I took out my air filters to be cleaned (k&n)... one air filter was visually, dirtier than the other.... whats up with that ?
Lately I have been watchin the needle of my gas tank drop... anyone have any input?
Fuel filter perhaps?
I dont have a fuel leak thats for sure... thanks for the help
PS - when I took out my air filters to be cleaned (k&n)... one air filter was visually, dirtier than the other.... whats up with that ?
Thread Starter
Super Member
Joined: May 2005
Posts: 558
Likes: 0
From: New York City
2000 CLK 430
Originally Posted by str8ridin
A bad MAF or bad o2 sensor can make your Miles Per Gallon seem like Gallons Per Mile. And most of the time, a MAF won't trigger a CEL.
anyway to check this?
thanx for the help
Tire pressure i am neurotic about... but i'll do that also
MBWorld Fanatic!
Joined: Jun 2004
Posts: 1,880
Likes: 9
From: Seattle
05 E55
Originally Posted by wnycec
anyway to check this?
thanx for the help
Tire pressure i am neurotic about... but i'll do that also
thanx for the help
Tire pressure i am neurotic about... but i'll do that also
Well, a bad o2 sensor will most likely trigger a code, but a bad MAF won't unless it's really bad, then sometimes it triggers an O2 code and it's not really an o2 problem. Atleast, that's what I've read and experienced.
Do you have K&N filters? If so, they have been suspect to premature MAF failure.
Generally, the MAFs on the CLK go out anywhere from 30k to 80k miles....at least that's the general mileage for people on here. If your gas mileage is going down, your acceleration is hesitant, shifts are not smooth and your car just acts tempramental, I would put it at a MAF problem.
I would just buy one online, put it in yourslef and see if you get a difference. If not, take it out, shelf it and now that you WILL have to use it eventurally.
