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Author Topic: Does a dirty air cleaner reduce your gas mileage Back to Topics
DoctorOH
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Cleveland

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Message Posted: Jun 23, 2012 8:05:04 AM

Does a dirty air cleaner reduce your gas mileage
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Hemond
Champion Author Providence

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Message Posted: Jan 8, 2014 4:24:57 PM

:::::Dirty air filters can cause all kinds of little sensors:::;


...can cause them to do what? You didn't finish the sentence.
magpie2013
Champion Author Milwaukee

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Message Posted: Jan 8, 2014 2:46:14 PM

Dirty air filters can cause all kinds of little sensors ,also if you have an air filter for the inside of your vehicle (my truck has one for inside of the crew cab.) can lead to smelly[ problems on the interior too. Best to change out with with oil changes.
Hemond
Champion Author Providence

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Message Posted: Jan 8, 2014 11:50:03 AM

The car's computer together with the mass airflow sensor will measure the reduced amount of intake air and compensate.

You will get a drop in power as the full capacity of the engine is not available. YOu won't get poor idling, poor emissions, or any other noticeable difference.
Vin63
Champion Author San Bernardino

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Message Posted: Jan 8, 2014 10:38:55 AM

Yes, it can.
PAA64
Champion Author Cincinnati

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Message Posted: Jan 6, 2014 12:30:06 AM

yes
dontuknowOH
Champion Author Ohio

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Message Posted: Dec 31, 2012 8:44:54 PM

A dirty air filter would have to restrict(hold back)air flow to a degree,not based on operational design tolerances.The ECM/EFI system will try to balance the drop in air flow as the filter falters,but that range of control gets compromized as the filter gets more plugged with dirt.

My guess is when the engine reaches near 70% throttle opening,performance is starting to suffer and even more for the last 30%...WOT,but who runs at highway speed at over 100 mph.

Old carb. operated engines simply went rich if those air filters got dirty over 30%,visible dirt could be blown away but the micro contamination,not seen cuts air flow causing a choked rich fuel wasting operation.The higher the rpms the more > richer use of fuel going in and out... as sooty...
Houckster
Champion Author Atlanta

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Message Posted: Dec 31, 2012 8:21:45 PM

Unless the filter becomes badly clogged by something like a combination of oil and dusts (caused by drawing air from the PCV valve), the air filter should not decrease mileage. There's a reason why the filter media is bright white and it relates to making it easier to convince consumers to buy new air filters.
dgsteven
Champion Author Los Angeles

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Message Posted: Dec 31, 2012 3:42:09 AM

not sure
JasTheAce
Champion Author Raleigh

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Message Posted: Dec 28, 2012 4:59:04 PM

yes indeed
gvan
Champion Author Chicago

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Message Posted: Dec 28, 2012 3:57:07 PM

Motor Week said the newer filters, when dirty, do not cause a decline in mpg. However, I could see a drop in mpg if you went 80,000 miles without a change or didn't ever change the filter.
jrferrari
All-Star Author Orlando

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Message Posted: Dec 28, 2012 10:00:46 AM

I typically change my air filter every other oil change. I don't notice a measurable jump in mileage after the change, but it probably doesn't get very dirty in that amount of time.
10261970
All-Star Author Sacramento

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Message Posted: Dec 28, 2012 9:41:59 AM

Yes.
Mikeoids
Champion Author Columbus

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Message Posted: Dec 27, 2012 7:58:26 PM

yes
bearscharger
Champion Author Cleveland

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Message Posted: Dec 27, 2012 4:23:42 PM

yes
DanFMA
Champion Author Massachusetts

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Message Posted: Dec 26, 2012 6:40:13 AM

Yes.
jack4141
Champion Author Alabama

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Message Posted: Dec 26, 2012 5:17:36 AM

Yes
dgsteven
Champion Author Los Angeles

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Message Posted: Dec 26, 2012 3:20:57 AM

yes, I guess
PaylessKY
Champion Author Kentucky

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Message Posted: Dec 26, 2012 12:27:45 AM

A well maintained vehicle which includes keeping a clean air filter will make it preform more efficiently.
Karisholman
Veteran Author Nevada

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Message Posted: Dec 24, 2012 10:50:20 PM

It will help, It can't hurt
xtremecheap
Champion Author Arkansas

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Message Posted: Dec 24, 2012 9:16:58 PM

No on an EFI. The computer tunes is down. You will lose power.
carinthuist
Champion Author San Francisco

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Message Posted: Dec 24, 2012 8:19:36 PM

Yes
CactusBobs
Champion Author Arizona

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Message Posted: Dec 24, 2012 11:26:34 AM

it would have to be caked with dirt in a gasoline engine to change MPG

But

in a diesel engine even a light coating can reduce performance and MPG

Every oil change , take it out , blow it out with air . if it looks to grubby or is falling apart , replace it

Don't be filling up the landfills with mostly clean air filters
hornet17
Champion Author Vancouver

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Message Posted: Dec 24, 2012 10:21:29 AM

yes it does.
the1roadhog
Champion Author Atlanta

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Message Posted: Dec 24, 2012 9:26:03 AM

Yes, engines need to breathe clean air
the1roadhog
Champion Author Atlanta

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Message Posted: Aug 15, 2012 8:22:23 AM

It doesn't help.
IAMCANADIAN73
Champion Author Ontario

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Message Posted: Aug 15, 2012 6:37:42 AM

Yes
outlaw329
Champion Author Austin

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Message Posted: Aug 15, 2012 1:10:22 AM

Yes it does
Z12
Champion Author Toledo

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Message Posted: Aug 14, 2012 9:26:57 PM

Don't know
anthroMO
Veteran Author St. Louis

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Message Posted: Aug 14, 2012 4:51:37 PM

yes
Watagump
All-Star Author Orange County

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Message Posted: Aug 13, 2012 10:03:24 AM

no
kxy4fw
Champion Author Denver

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Message Posted: Aug 13, 2012 9:48:00 AM

yes
2011370Z
Champion Author Phoenix

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Message Posted: Aug 12, 2012 11:47:10 AM

Yes
Banjoe
Champion Author Winnipeg

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Message Posted: Aug 12, 2012 7:50:02 AM

Not as much as dirty gas.
dontuknowOH
Champion Author Ohio

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Message Posted: Aug 8, 2012 5:15:51 PM

Really the air filter called the cabin filter can cause excess fuel to be consummed. If that filter gets clogged and it will,then the comfort air flow becomes compromised. That air whether heated or cooled gets restricted and much more blower speed is needed to push it forward out the vents.

The vehicles altenator sees this increased amperage as a heavier load(then more engine HP.is required to make up that load differience).Some vehicles have them some don't Ask your auto parts store.maybe DIY the replacement yourself. GL....
2amy
Champion Author Fresno

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Message Posted: Aug 8, 2012 3:07:58 PM

Yes.
Aaron33409
Champion Author Miami

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Message Posted: Aug 8, 2012 12:15:48 PM

yes up to 5%
nichols
Champion Author Halifax

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Message Posted: Aug 8, 2012 10:37:39 AM

not until it gets really dirty
kxy4fw
Champion Author Denver

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Message Posted: Aug 8, 2012 10:17:10 AM

yes
Hemond
Champion Author Providence

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Message Posted: Aug 8, 2012 9:19:45 AM

QUOTE """I would worry more about getting your mass air flow sensor dirty if your engine air filter is getting too old."""


The MAF has an automatic clean cycle. Each time you shut down the cycle runs. Works similar to a self cleaning oven.
IAMCANADIAN73
Champion Author Ontario

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Message Posted: Aug 8, 2012 1:50:21 AM

Yes
Commute2
Champion Author District of Columbia

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Message Posted: Aug 7, 2012 11:15:34 PM

I believe it does
rrtruck
Champion Author Austin

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Message Posted: Jul 28, 2012 9:06:34 PM

Definitely
97PearlCat
Champion Author Tulsa

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Message Posted: Jul 28, 2012 3:04:12 PM

Yes
Bridge2012
Champion Author Kansas

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Message Posted: Jul 28, 2012 8:43:06 AM

Yes
IAMCANADIAN73
Champion Author Ontario

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Message Posted: Jul 28, 2012 8:10:41 AM

Yes
Banjoe
Champion Author Winnipeg

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Message Posted: Jul 28, 2012 7:52:48 AM

priznsara - yes, this is not correct. Shockjock1961 nailed it exactly right. A dirty filter provides better air filtration but a plugged filter is a very bad thing.

The problem here, like many places in life, is that you have to figure out when "dirty" becomes a bad thing. Takes a bit of knowledge, pressure drop meters, experience, mileage tracking, or just throw some money at it when you think it's time.

I wouldn't change my air filter every week just to make sure my filter is clean.

This topic sure has legs.
bithehr
Champion Author Atlanta

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Message Posted: Jul 28, 2012 7:07:32 AM

yes
grasshoppa2012
Rookie Author Houston

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Message Posted: Jul 28, 2012 3:59:29 AM

I've got a k&n and clean it every other oil change (10,000 miles). Ive experienced better mpg with it good and clean... Just my experience.
kxy4fw
Champion Author Denver

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Message Posted: Jul 26, 2012 9:21:43 AM

yes
priznsara
Champion Author New Mexico

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Message Posted: Jul 25, 2012 1:52:49 PM

I have always heard a dirty filter does reduce gas mileage - is this not correct?
Shockjock1961
Champion Author Illinois

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Message Posted: Jul 25, 2012 12:15:24 PM

My definition of a dirty air filter is one that substantially reduces air flow, one WELL past it's recommended replacement interval.

If the filter completely blocks air flow, well of course the engine simply will not run...
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