Welcome to the North American Subaru Impreza Owners Club Thursday July 18, 2019
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo)

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 06-12-2019, 10:46 PM   #1
08SpecB_DE
Scooby Newbie
 
Member#: 470981
Join Date: Jul 2017
Chapter/Region: Tri-State
Location: Delaware
Vehicle:
2008 Legacy GT spec
DGM

Default Odd starting issue

Hey guys,

Long story short, every year when it starts to get warm, my car has a hard time starting. Let's say its 60 in the morning, car fires up fine. At the end of a work day its 85 and the car will crank and crank. I've primed the pump thinking it or an injector was leaking down, that didn't help. The only thing that does help is holding the gas pedal down just a little bit. Now that it has been consistently warm, it starts every time no matter the conditions.*

I have a fpr sitting on my toolbox but I dont want to put it on if it's something silly like the ots tune adjusting to temperature fluctuation. Perhaps I should start with cleaning the*throttle*body? I'm a little nervous about cleaning the maf, I've seen them get ruined even when using maf cleaner. Should I try anyways?
* Registered users of the site do not see these ads.
08SpecB_DE is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 06-13-2019, 07:28 AM   #2
Jay11STI
Scooby Newbie
 
Member#: 492422
Join Date: Oct 2018
Default

Yeah i wouldnt recommend cleaning the MAF, i think its a bunch of nonsense and usually leads to them failing. I would recommend replacing the MAF and see if anything changes.

What kind of car do you have? Modds? Maintenance? Mileage?
Jay11STI is online now   Reply With Quote
Old 06-13-2019, 08:42 PM   #3
08SpecB_DE
Scooby Newbie
 
Member#: 470981
Join Date: Jul 2017
Chapter/Region: Tri-State
Location: Delaware
Vehicle:
2008 Legacy GT spec
DGM

Default

Quote:
Originally Posted by Jay11STI View Post
Yeah i wouldnt recommend cleaning the MAF, i think its a bunch of nonsense and usually leads to them failing. I would recommend replacing the MAF and see if anything changes.

What kind of car do you have? Modds? Maintenance? Mileage?
2008 LGT spec B ~120k miles
Cobb ots stage 2 93 octane
Invidia catted downpipe with magnaflow cat-back
AEM dryflow air filter
GFB hybrid bov set on full recirc

The car runs good otherwise. I bought it almost 7 years ago with 60k on the odometer. I did the t-belt at 98k in 2015 and new ngk o.e. plugs about 15k miles ago. Everything else is original...maf, af/o2's, turbo, fuel pump, etc. I have a new vf52 and gs intercooler waiting for me to install, I just need the time and the hassle of getting it to a dyno or e-tune is prolonging the process. I burn maybe a quart every 4k miles.
08SpecB_DE is offline   Reply With Quote
Old 06-13-2019, 08:52 PM   #4
Suryank
*** Banned ***
 
Member#: 500698
Join Date: Apr 2019
Default

Quote:
Originally Posted by Jay11STI View Post
Yeah i wouldnt recommend cleaning the MAF, i think its a bunch of nonsense and usually leads to them failing. I would recommend replacing the MAF and see if anything changes.

What kind of car do you have? Modds? Maintenance? Mileage?
+1
Suryank is offline   Reply With Quote
Old 06-14-2019, 07:19 AM   #5
Jay11STI
Scooby Newbie
 
Member#: 492422
Join Date: Oct 2018
Default

Quote:
Originally Posted by 08SpecB_DE View Post
2008 LGT spec B ~120k miles
Cobb ots stage 2 93 octane
Invidia catted downpipe with magnaflow cat-back
AEM dryflow air filter
GFB hybrid bov set on full recirc

The car runs good otherwise. I bought it almost 7 years ago with 60k on the odometer. I did the t-belt at 98k in 2015 and new ngk o.e. plugs about 15k miles ago. Everything else is original...maf, af/o2's, turbo, fuel pump, etc. I have a new vf52 and gs intercooler waiting for me to install, I just need the time and the hassle of getting it to a dyno or e-tune is prolonging the process. I burn maybe a quart every 4k miles.
At 120K yeah id say its time to start with a MAF and oxygen sensors. Especially if they are all originals.
Jay11STI is online now   Reply With Quote
Old 06-14-2019, 09:24 AM   #6
Scorpius
Scooby Specialist
 
Member#: 370806
Join Date: Oct 2013
Location: Northern Indiana
Vehicle:
2019 WRX/STI DGM
2016 WRX/STI ISM

Default

Quote:
Originally Posted by Jay11STI View Post
Yeah i wouldnt recommend cleaning the MAF, i think its a bunch of nonsense and usually leads to them failing. I would recommend replacing the MAF and see if anything changes.

What kind of car do you have? Modds? Maintenance? Mileage?
Huh? If done correctly cleaning the MAF can fix issues IF it's dirty.
Scorpius is offline   Reply With Quote
Old 06-15-2019, 08:32 PM   #7
08SpecB_DE
Scooby Newbie
 
Member#: 470981
Join Date: Jul 2017
Chapter/Region: Tri-State
Location: Delaware
Vehicle:
2008 Legacy GT spec
DGM

Default

I see folks have good luck with Denso 197-6040 maf sensor. Do you guys think I can get away with NTK af/o2's? O.E. maf is around 150 and same for the front 02. I'm not opposed to going o.e. as I'm very familiar with aftermarket parts and how ****ty they can be but every now and then you get lucky and are able to save a little going aftermarket.
08SpecB_DE is offline   Reply With Quote
Old 06-17-2019, 07:45 PM   #8
08SpecB_DE
Scooby Newbie
 
Member#: 470981
Join Date: Jul 2017
Chapter/Region: Tri-State
Location: Delaware
Vehicle:
2008 Legacy GT spec
DGM

Default

Bump...
08SpecB_DE is offline   Reply With Quote
Old 06-17-2019, 08:15 PM   #9
Scorpius
Scooby Specialist
 
Member#: 370806
Join Date: Oct 2013
Location: Northern Indiana
Vehicle:
2019 WRX/STI DGM
2016 WRX/STI ISM

Default

Quote:
Originally Posted by 08SpecB_DE View Post
I see folks have good luck with Denso 197-6040 maf sensor. Do you guys think I can get away with NTK af/o2's? O.E. maf is around 150 and same for the front 02. I'm not opposed to going o.e. as I'm very familiar with aftermarket parts and how ****ty they can be but every now and then you get lucky and are able to save a little going aftermarket.
Always, always, stay OEM with MAF sensors.
Scorpius is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -4. The time now is 07:46 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2019 Axivo Inc.
Copyright ©1999 - 2017, North American Subaru Impreza Owners Club, Inc.