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Stock gm air filter gauge #4558547
10/29/17 03:39 PM
10/29/17 03:39 PM
Joined: Jun 2003
Posts: 17,815
Deplorable in apple valley, ca
Chris142 Offline OP
Chris142  Offline OP
Joined: Jun 2003
Posts: 17,815
Deplorable in apple valley, ca
I picked up a lid for the wifes 04 tahoe that has the restriction gauge built in. It has a 50% and an 80% on the gauge. Any ideas how that translates to actual restriction?


02 Wrangler carlube 5w30
87 F250 traveler 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: Stock gm air filter gauge [Re: Chris142] #4558570
10/29/17 04:15 PM
10/29/17 04:15 PM
Joined: Dec 2015
Posts: 92
Pocatello, Idaho
compratio10_5 Offline
compratio10_5  Offline
Joined: Dec 2015
Posts: 92
Pocatello, Idaho
According to an Oak Ridge National Laboratory study entitled "Effect of Intake Air Filter Condition on Vehicle Fuel Economy" Conducted in 2009, a similar factory OEM indicator taken from a 2001 Chevrolet Silverado with 5.3L V-8, measured 5.7 kPa (23 " H2O) at the level that the indicator entered the red zone. I suppose that the percentages apply to the full scale reading. They found no effect on fuel economy with computer controlled engines from air filter restriction but some power loss at full open throttle with high restriction. Since air filter efficiency improves with restriction, a reasonable air filter change point might be at the 80% level unless you are into drag racing this vehicle.


It's not what you don't know that hurts, it's what you think you know that ain't so. Will Rogers
Re: Stock gm air filter gauge [Re: Chris142] #4558668
10/29/17 06:01 PM
10/29/17 06:01 PM
Joined: Sep 2005
Posts: 5,909
MIchigan
Warstud Offline
Warstud  Offline
Joined: Sep 2005
Posts: 5,909
MIchigan
As the filter becomes clogged and becomes restrictive the spring becomes less visible. Is it color coded?

Re: Stock gm air filter gauge [Re: Chris142] #4558756
10/29/17 07:35 PM
10/29/17 07:35 PM
Joined: Jun 2003
Posts: 17,815
Deplorable in apple valley, ca
Chris142 Offline OP
Chris142  Offline OP
Joined: Jun 2003
Posts: 17,815
Deplorable in apple valley, ca
Not drag racing but she does lots of trips up and down cajon pass. Needs all the power it has.


02 Wrangler carlube 5w30
87 F250 traveler 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: Stock gm air filter gauge [Re: Warstud] #4558757
10/29/17 07:35 PM
10/29/17 07:35 PM
Joined: Jun 2003
Posts: 17,815
Deplorable in apple valley, ca
Chris142 Offline OP
Chris142  Offline OP
Joined: Jun 2003
Posts: 17,815
Deplorable in apple valley, ca
Originally Posted By: Warstud
As the filter becomes clogged and becomes restrictive the spring becomes less visible. Is it color coded?
no color code till the bottom. Its red.


02 Wrangler carlube 5w30
87 F250 traveler 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: Stock gm air filter gauge [Re: Chris142] #4558795
10/29/17 08:04 PM
10/29/17 08:04 PM
Joined: Sep 2005
Posts: 5,909
MIchigan
Warstud Offline
Warstud  Offline
Joined: Sep 2005
Posts: 5,909
MIchigan
Originally Posted By: Chris142
Originally Posted By: Warstud
As the filter becomes clogged and becomes restrictive the spring becomes less visible. Is it color coded?
no color code till the bottom. Its red.


Red means it's time for a new filter.

Re: Stock gm air filter gauge [Re: compratio10_5] #4558835
10/29/17 08:46 PM
10/29/17 08:46 PM
Joined: Oct 2016
Posts: 232
California
jj51702 Offline
jj51702  Offline
Joined: Oct 2016
Posts: 232
California
Originally Posted By: compratio10_5
According to an Oak Ridge National Laboratory study entitled "Effect of Intake Air Filter Condition on Vehicle Fuel Economy" Conducted in 2009, a similar factory OEM indicator taken from a 2001 Chevrolet Silverado with 5.3L V-8, measured 5.7 kPa (23 " H2O) at the level that the indicator entered the red zone. I suppose that the percentages apply to the full scale reading. They found no effect on fuel economy with computer controlled engines from air filter restriction but some power loss at full open throttle with high restriction. Since air filter efficiency improves with restriction, a reasonable air filter change point might be at the 80% level unless you are into drag racing this vehicle.


Excellent post. Need more members like u plz

Last edited by jj51702; 10/29/17 08:47 PM.
Re: Stock gm air filter gauge [Re: Chris142] #4558848
10/29/17 09:03 PM
10/29/17 09:03 PM
Joined: Oct 2012
Posts: 4,825
Taiwan
Ducked Offline
Ducked  Offline
Joined: Oct 2012
Posts: 4,825
Taiwan
IIRC that Oak Ridge study (available online last week) gives 10 inches of water (in excess of the negative pressure generated by a new filter) as a reasonable rule-of-thumb restriction for a filter change.

Re: Stock gm air filter gauge [Re: Ducked] #4558858
10/29/17 09:43 PM
10/29/17 09:43 PM
Joined: Dec 2015
Posts: 92
Pocatello, Idaho
compratio10_5 Offline
compratio10_5  Offline
Joined: Dec 2015
Posts: 92
Pocatello, Idaho
Yes, the study does recommend 10 " H2O above the clean filter restriction as a "rule of thumb" air filter change point, but on a factory installed gauge I believe that the manufacturer selects the red zone as the normal filter replacement point. In any case, if the drop in power is objectionable just change the filter earlier at 50% for example. In most situations, if you are not often driving on dirt roads, the air filter will last far longer than you expect. Installing these filter minder gauges is one of the best things that General Motors has done on its trucks. This saves the owners money on filters and extends engine life. A rare win-win situation.


It's not what you don't know that hurts, it's what you think you know that ain't so. Will Rogers
Re: Stock gm air filter gauge [Re: Chris142] #4558995
10/30/17 06:16 AM
10/30/17 06:16 AM
Joined: Jun 2003
Posts: 17,815
Deplorable in apple valley, ca
Chris142 Offline OP
Chris142  Offline OP
Joined: Jun 2003
Posts: 17,815
Deplorable in apple valley, ca
We live on dirt roads. Plus the wind always blows and we get dust storms almost every day. I bought a wix HD air filter for it.


02 Wrangler carlube 5w30
87 F250 traveler 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: Stock gm air filter gauge [Re: Chris142] #4558998
10/30/17 06:18 AM
10/30/17 06:18 AM
Joined: Aug 2008
Posts: 21,260
ON, Canada eh?
StevieC Offline
StevieC  Offline
Joined: Aug 2008
Posts: 21,260
ON, Canada eh?
You would think with the push on fuel economy today and CAFE, that air filter indicators would be standard equipment today on most vehicles. ?!? shrug

Last edited by StevieC; 10/30/17 06:18 AM.

'18 Dodge Grand Caravan GT - AMSOIL SS 5w20
'06 Santa Fe - 535,000km AMSOIL SS 0w30 / ATF
Re: Stock gm air filter gauge [Re: StevieC] #4559341
10/30/17 01:42 PM
10/30/17 01:42 PM
Joined: Aug 2008
Posts: 2,181
Cali
Malo83 Offline
Malo83  Offline
Joined: Aug 2008
Posts: 2,181
Cali
Just change it out annualy and you will sleep better. cheers

Re: Stock gm air filter gauge [Re: StevieC] #4559656
10/30/17 07:19 PM
10/30/17 07:19 PM
Joined: Mar 2016
Posts: 1,639
Western S.C.
CR94 Offline
CR94  Offline
Joined: Mar 2016
Posts: 1,639
Western S.C.
Originally Posted By: StevieC
You would think with the push on fuel economy today and CAFE, that air filter indicators would be standard equipment today on most vehicles. ?!?
No, I wouldn't think that, because replacing the air filter doesn't help fuel economy in most vehicles---as already explained in this thread and many others. It may help in vehicles too old to have self-adjusting fuel mixture control. Even in those, the restriction has to be pretty bad to make much difference in normal driving.


2011 Toyota Prius now at 94K
1981 Mazda GLC (323) retired at 606K
1972 Subaru DL retired at 190K
1954 Chevrolet retired at 121K
Re: Stock gm air filter gauge [Re: Chris142] #4559674
10/30/17 07:40 PM
10/30/17 07:40 PM
Joined: Jun 2003
Posts: 17,815
Deplorable in apple valley, ca
Chris142 Offline OP
Chris142  Offline OP
Joined: Jun 2003
Posts: 17,815
Deplorable in apple valley, ca
I wonder why some trucks get them and others dont? Ours never had one. I bet 90% of the chevy trucks I get at work do have them.


02 Wrangler carlube 5w30
87 F250 traveler 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40

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