Cleaned MAF, idle problem - Page 4 - Subaru Enthusiasts Car Club of the Sierras

ddub · 2007-11-16, 03:41 PM

I agree, there has to be unmetered air coming in somewhere. Unless my O2 sensor is bad, but tests good?? I checked all the hoses, vacuum lines, we tried plugging the BPV as well, even put a new one on. I'm gonna do another test run now...

ddub · 2007-11-16, 05:14 PM

Double checked. A/F ratio while going 70mph is at 14.4:1, correction factor stayed between -.75 and 2. I'm confused...

100_Percent_Juice · 2007-11-16, 07:03 PM

I just cleaned my IAC and my idles a lot better. You should try it for a cheap fix and you don't even need to remove anything to get to it.
http://forums.nasioc.com/forums/show...ight=clean+IAC

Oh and make sure all the hose clamps are straight on the intercooler hoses. I know that I have put some on crooked by mistake when in a rush or late at night.

ddub · 2007-11-17, 02:11 PM

I just cleaned the IAC and put a new gasket in. It was dirty, but it still idles the same. I have checked and double checked all the hose connections, there all good. Is it possible to change the idle tables? I don't even know if they exist.

knucklesplitter · 2007-11-17, 02:56 PM

Quote:

Originally Posted by ddub

Is it possible to change the idle tables? I don't even know if they exist.

There are no "idle tables" that I know of. The MAF table could be rigged to make it run better, but that is a bandaid, and as soon as the problem is found and fixed you will start running -25 fuel trim and be too rich.

dayofpain · 2007-11-17, 08:28 PM

did u try the wiring fix ?

Dean · 2007-11-17, 10:13 PM

It's not the ECU or the map if it was working well at some point, and especially if you throw a stock air box back on and it still has the same problem.

Put a stock air box on and uninstall the AP and take it to Subaru.

Based on your AF trims, other than unmetered air after the MAF, I'm out of ideas.

ddub · 2007-11-18, 09:31 AM

My last attempt will be the stock air box. I do not have one here, but will be going home this weekend. I think my air box is there. If it doesn't work, then its off to subaru.

ddub · 2007-11-18, 10:18 AM

Just found out that I no longer have a stock air box.

Dean, could I grab that stock air box from you and give it a try? If it doesn't have a filter, I can buy one or maybe go to a junk yard and grab one.

ddub · 2007-11-18, 10:17 PM

So I feel dumb. The stock air box solved all. A/F ratio is right at 14.7 with 0 on the correction factor at idle.

Maybe after cleaning the air filter for a second time (or even third), it was flowing more air and/or creating more turbulance. So the MAF sensor was seeing less air, when more air was actually flowing by. The sensor could not correct enough for the extra air flowing by, therefore running lean. I still don't understand why this would happen after cleaning the MAF?

Thanks for all the support everyone, I appreciate it.

Dean, can I buy your air box off of you? If not, can I keep it until I get a new one? I also may be interested in you TMIC.

Dean · 2007-11-18, 10:39 PM

Glad that fixed it!

I'd like to get my air box back or a replacement at some point in case I ever take my car back to stock, but no rush.

We probably have somebody who isn't ever going back to stock or you can pick up a used one cheap either locally or from Rancho Cordova.

dayofpain · 2007-11-18, 10:39 PM

you cleaned the filter at the same time as the maf ?

100_Percent_Juice · 2007-11-18, 10:54 PM

I thought the stock airbox was one of the first things you tried... or I guess it should have been

knucklesplitter · 2007-11-19, 11:07 AM

That's a weird coincidence or whatever. If you want to still go with a short ram (for whatever reasons) the Cobb acts just like the stock airbox in my experience (except for the whole hot air thing).

cody · 2007-11-19, 11:11 AM

My two cents:

Choose a good CAI or the stocker
Choose your filter element
Get custom tuned
Stick with the same filter element when replacing it or cleaning it (often)
Profit

(in that order)

ddub · 2007-11-19, 02:27 PM

The last time I cleaned the filter was 5000 miles ago. If I had my original stock air box, I probably would have tried that first. Its just weird that the intake would affect idle after 50k+ miles and cleaning the MAF sensor. My guess is that the filter is no good anymore. I will be looking into getting a different intake and a retune eventually. I need to find a stock air box for now.

dayofpain · 2007-11-19, 02:44 PM

aps or bust

ddub · 2007-11-19, 08:55 PM

Anyone know where I can pick up a stock air box? The dealer is way overpriced. I was looking into Cobb's intake, but its made of plastic and I heard it falls apart.

cody · 2007-11-19, 09:07 PM

Nasioc classifieds is always an option as well as www.subaruparts.com and www.subarugenuineparts.com

Dean · 2007-11-19, 11:02 PM

Quote:

Originally Posted by ddub

Anyone know where I can pick up a stock air box? The dealer is way overpriced. I was looking into Cobb's intake, but its made of plastic and I heard it falls apart.

Wreckers in Rancho Cordova or even local are a good bet.

I have a generic in fender CAI lying around. Check this thread.

http://www.seccs.org/forums/showthread.php?t=5863

knucklesplitter · 2007-11-19, 11:36 PM

I have a brand new never-installed older APS CAI (stock 65mm dia). It is black not wrinkle red. PM me if interested

dayofpain · 2007-11-20, 12:05 AM

you should jump on that, they react just like stock airbox.

sperry · 2007-11-20, 10:56 AM

I might have a stock airbox... or at least one with the silencer cut off it.

cody · 2007-11-20, 11:00 AM

The silencer is a seperate piece. Yous houldn't have to "cut" anything.

sperry · 2007-11-20, 11:14 AM

Quote:

Originally Posted by cody

The silencer is a seperate piece. Yous houldn't have to "cut" anything.

Well, if he wants an air box that breathes from under the hood instead of from the fender or the snorkus... then sure. But I've got the elbow from the fender (with the silence cut off it) and the snorkus too I think.

2007-11-16, 07:03 PM	#78
100_Percent_Juice (40 percent vodka) Real Name: Joel Join Date: Oct 2006 Location: Reno, NV Posts: 4,446 Car: 2004WRX Class: Baby-Hauler/GroceryGetter	I just cleaned my IAC and my idles a lot better. You should try it for a cheap fix and you don't even need to remove anything to get to it. http://forums.nasioc.com/forums/show...ight=clean+IAC Oh and make sure all the hose clamps are straight on the intercooler hoses. I know that I have put some on crooked by mistake when in a rush or late at night. __________________ "A power nap is when you sleep on someone who is weaker than you." - Dimitri Martin

2007-11-17, 08:28 PM	#81
dayofpain R.I.P. Join Date: Apr 2003 Location: reno, nv Posts: 599 Car: 09 335xi silva	did u try the wiring fix ? __________________ DayOfPain "In order for me to get busy at maximum efficiency, i need a girl with a big 400 ton booty."

2007-11-17, 10:13 PM	#82
Dean Señor Cheap Bastarde Real Name: Dean Join Date: May 2003 Location: $99 Tire Store Posts: 9,294 Car: $.04 STI Class: Fast,Cheap & Reliable=STI Deal, did somebody say Deal? Oh, Dean, yeah that's me.	It's not the ECU or the map if it was working well at some point, and especially if you throw a stock air box back on and it still has the same problem. Put a stock air box on and uninstall the AP and take it to Subaru. Based on your AF trims, other than unmetered air after the MAF, I'm out of ideas. __________________ I am a Commodore PET --- Now get off my lawn you kids... Last edited by Dean; 2007-11-18 at 10:15 AM.

2007-11-18, 10:39 PM	#86
Dean Señor Cheap Bastarde Real Name: Dean Join Date: May 2003 Location: $99 Tire Store Posts: 9,294 Car: $.04 STI Class: Fast,Cheap & Reliable=STI Deal, did somebody say Deal? Oh, Dean, yeah that's me.	Glad that fixed it! I'd like to get my air box back or a replacement at some point in case I ever take my car back to stock, but no rush. We probably have somebody who isn't ever going back to stock or you can pick up a used one cheap either locally or from Rancho Cordova. __________________ I am a Commodore PET --- Now get off my lawn you kids... Last edited by Dean; 2007-11-18 at 10:43 PM.

2007-11-18, 10:39 PM	#87
dayofpain R.I.P. Join Date: Apr 2003 Location: reno, nv Posts: 599 Car: 09 335xi silva	you cleaned the filter at the same time as the maf ? __________________ DayOfPain "In order for me to get busy at maximum efficiency, i need a girl with a big 400 ton booty."

2007-11-16, 03:41 PM	#76
ddub EJ22 Join Date: Aug 2005 Location: Reno, NV Posts: 110 Car: 04 wrx, bunch of mods	I agree, there has to be unmetered air coming in somewhere. Unless my O2 sensor is bad, but tests good?? I checked all the hoses, vacuum lines, we tried plugging the BPV as well, even put a new one on. I'm gonna do another test run now...

2007-11-16, 05:14 PM	#77
ddub EJ22 Join Date: Aug 2005 Location: Reno, NV Posts: 110 Car: 04 wrx, bunch of mods	Double checked. A/F ratio while going 70mph is at 14.4:1, correction factor stayed between -.75 and 2. I'm confused...

2007-11-17, 02:11 PM	#79
ddub EJ22 Join Date: Aug 2005 Location: Reno, NV Posts: 110 Car: 04 wrx, bunch of mods	I just cleaned the IAC and put a new gasket in. It was dirty, but it still idles the same. I have checked and double checked all the hose connections, there all good. Is it possible to change the idle tables? I don't even know if they exist.

2007-11-18, 09:31 AM	#83
ddub EJ22 Join Date: Aug 2005 Location: Reno, NV Posts: 110 Car: 04 wrx, bunch of mods	My last attempt will be the stock air box. I do not have one here, but will be going home this weekend. I think my air box is there. If it doesn't work, then its off to subaru.

2007-11-18, 10:18 AM	#84
ddub EJ22 Join Date: Aug 2005 Location: Reno, NV Posts: 110 Car: 04 wrx, bunch of mods	Just found out that I no longer have a stock air box. Dean, could I grab that stock air box from you and give it a try? If it doesn't have a filter, I can buy one or maybe go to a junk yard and grab one.

2007-11-18, 10:17 PM	#85
ddub EJ22 Join Date: Aug 2005 Location: Reno, NV Posts: 110 Car: 04 wrx, bunch of mods	So I feel dumb. The stock air box solved all. A/F ratio is right at 14.7 with 0 on the correction factor at idle. Maybe after cleaning the air filter for a second time (or even third), it was flowing more air and/or creating more turbulance. So the MAF sensor was seeing less air, when more air was actually flowing by. The sensor could not correct enough for the extra air flowing by, therefore running lean. I still don't understand why this would happen after cleaning the MAF? Thanks for all the support everyone, I appreciate it. Dean, can I buy your air box off of you? If not, can I keep it until I get a new one? I also may be interested in you TMIC.

2007-11-18, 10:54 PM	#88
100_Percent_Juice (40 percent vodka) Real Name: Joel Join Date: Oct 2006 Location: Reno, NV Posts: 4,446 Car: 2004WRX Class: Baby-Hauler/GroceryGetter	I thought the stock airbox was one of the first things you tried... or I guess it should have been __________________ "A power nap is when you sleep on someone who is weaker than you." - Dimitri Martin

2007-11-19, 11:07 AM	#89
knucklesplitter EJ205 Real Name: Matt Taylor Join Date: Jun 2005 Location: Cousin-Fck, Carolina Posts: 1,475 Wish in one hand and sht in the other...	That's a weird coincidence or whatever. If you want to still go with a short ram (for whatever reasons) the Cobb acts just like the stock airbox in my experience (except for the whole hot air thing).

2007-11-19, 11:11 AM	#90
cody Candy Mountain Real Name: Cody Join Date: May 2005 Location: Californication Posts: 7,751 Car: 03 Pussy Wagon, now with more pink! Class: TESP OMG Internet!	My two cents: Choose a good CAI or the stocker Choose your filter element Get custom tuned Stick with the same filter element when replacing it or cleaning it (often) Profit (in that order) __________________ Slow and low, that is the tempo.

2007-11-19, 02:27 PM	#91
ddub EJ22 Join Date: Aug 2005 Location: Reno, NV Posts: 110 Car: 04 wrx, bunch of mods	The last time I cleaned the filter was 5000 miles ago. If I had my original stock air box, I probably would have tried that first. Its just weird that the intake would affect idle after 50k+ miles and cleaning the MAF sensor. My guess is that the filter is no good anymore. I will be looking into getting a different intake and a retune eventually. I need to find a stock air box for now.

2007-11-19, 02:44 PM	#92
dayofpain R.I.P. Join Date: Apr 2003 Location: reno, nv Posts: 599 Car: 09 335xi silva	aps or bust __________________ DayOfPain "In order for me to get busy at maximum efficiency, i need a girl with a big 400 ton booty."

2007-11-19, 08:55 PM	#93
ddub EJ22 Join Date: Aug 2005 Location: Reno, NV Posts: 110 Car: 04 wrx, bunch of mods	Anyone know where I can pick up a stock air box? The dealer is way overpriced. I was looking into Cobb's intake, but its made of plastic and I heard it falls apart.

2007-11-19, 09:07 PM	#94
cody Candy Mountain Real Name: Cody Join Date: May 2005 Location: Californication Posts: 7,751 Car: 03 Pussy Wagon, now with more pink! Class: TESP OMG Internet!	Nasioc classifieds is always an option as well as www.subaruparts.com and www.subarugenuineparts.com __________________ Slow and low, that is the tempo.

2007-11-19, 11:36 PM	#96
knucklesplitter EJ205 Real Name: Matt Taylor Join Date: Jun 2005 Location: Cousin-Fck, Carolina Posts: 1,475 Wish in one hand and sht in the other...	I have a brand new never-installed older APS CAI (stock 65mm dia). It is black not wrinkle red. PM me if interested

2007-11-20, 12:05 AM	#97
dayofpain R.I.P. Join Date: Apr 2003 Location: reno, nv Posts: 599 Car: 09 335xi silva	you should jump on that, they react just like stock airbox. __________________ DayOfPain "In order for me to get busy at maximum efficiency, i need a girl with a big 400 ton booty."

2007-11-20, 10:56 AM	#98
sperry The Doink Real Name: Scott Join Date: Nov 2002 Location: Portland, OR Posts: 20,335 Car: '09 OBXT, '02 WRX, '96 Miata Class: PDX/TT-6 The way out is through	I might have a stock airbox... or at least one with the silencer cut off it. __________________ Is you is, or is you ain't, my con-stit-u-ints?

2007-11-20, 11:00 AM	#99
cody Candy Mountain Real Name: Cody Join Date: May 2005 Location: Californication Posts: 7,751 Car: 03 Pussy Wagon, now with more pink! Class: TESP OMG Internet!	The silencer is a seperate piece. Yous houldn't have to "cut" anything. __________________ Slow and low, that is the tempo.

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