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Old 11-16-2020, 03:36 PM   #1
clappedoutwag
Scooby Newbie
 
Member#: 520323
Join Date: Nov 2020
Chapter/Region: South East
Location: Tennessee
Vehicle:
2004 imp wrx wagon
Aspen White

Default car stutters and starts to bog around 4k

under normal driving conditions my car starts to stutter around 4k, i dont know how to explain it other than it feels like the car is eating itself. Its holding boost so idk. im thinking about replacing my fuel filter to see if that helps. Has anyone experienced this problem? ALL SUGGESTIONS HELP

Edit: could it possibly be the maf?
Edit: for more details pertaining to the issue, it only happens under wot, i can ease past 4k with a little less than half throttle.
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Last edited by clappedoutwag; 11-18-2020 at 02:57 PM.
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Old 11-16-2020, 06:21 PM   #2
ragingrambodian
Scooby Newbie
 
Member#: 504159
Join Date: Jul 2019
Location: Washington state
Vehicle:
2002 Impreza wrx

Default

If you think itís the MAF.

You should clean it with MAF cleaner. And test it before getting a new one.

I usually run a car with the MAF plugged in,then pull it while itís idling to see if there is a drastic change on the motor running.

If it runs exactly the same with and without the MAF plugged in, then you know the MAF is not working. I still had the same issues, and I did all of that first.

Then I regapped my spark plugs to make it easier for my spark to not get snuffed out.
(Iím running more than stock boost).
Still acted up.

Then I replaced all my coil packs with factory oem from Subaru. Pricey, but I have 02 so they needed to get replaced anyways.

Car runs like a champ now. Fingers crossed.

PS. I would wait on buying coils until you make sure all vacuum lines are good, and your battery cables and grounds are good.

PSS. You should also look up stickies and FAQs about misfires. They have way more useful info and steps. This is just anecdotal.

Also take my advice with a grain of salt. I just got into subies since I got out of the game for 10 years.
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Old 11-17-2020, 11:16 AM   #3
ericsson
Scooby Specialist
 
Member#: 208672
Join Date: Apr 2009
Chapter/Region: TXIC
Location: Houston, TX
Vehicle:
2013 WRX STI Limited
Obsidian Black

Default

If you have a stage 2+, and you have a feeling is not a vacuum leak, MAF, fuel filter, or the already listed above, you can look into the two below:

-Turbo inlet may be loose or have a hole
-GR stumble kit is needed (aka fuel pressure regulator)

My car suffered from both of them at the same time.
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Old 11-18-2020, 11:33 AM   #4
clappedoutwag
Scooby Newbie
 
Member#: 520323
Join Date: Nov 2020
Chapter/Region: South East
Location: Tennessee
Vehicle:
2004 imp wrx wagon
Aspen White

Default

thanks for the input, ill get back to you this weekend if i find the solution
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Old 11-18-2020, 11:42 AM   #5
clappedoutwag
Scooby Newbie
 
Member#: 520323
Join Date: Nov 2020
Chapter/Region: South East
Location: Tennessee
Vehicle:
2004 imp wrx wagon
Aspen White

Default

Quote:
Originally Posted by ragingrambodian View Post
If you think itís the MAF.

You should clean it with MAF cleaner. And test it before getting a new one.

I usually run a car with the MAF plugged in,then pull it while itís idling to see if there is a drastic change on the motor running.

If it runs exactly the same with and without the MAF plugged in, then you know the MAF is not working. I still had the same issues, and I did all of that first.

Then I regapped my spark plugs to make it easier for my spark to not get snuffed out.
(Iím running more than stock boost).
Still acted up.

Then I replaced all my coil packs with factory oem from Subaru. Pricey, but I have 02 so they needed to get replaced anyways.

Car runs like a champ now. Fingers crossed.

PS. I would wait on buying coils until you make sure all vacuum lines are good, and your battery cables and grounds are good.

PSS. You should also look up stickies and FAQs about misfires. They have way more useful info and steps. This is just anecdotal.

Also take my advice with a grain of salt. I just got into subies since I got out of the game for 10 years.

thanks, I already have coil packs waiting to be put on so hopefully that helps. (detonation possibly?) if i find the problem and fix it ill get back to you
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