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Old 04-06-2020, 06:24 PM   #1
EazyDuzIt
Scooby Newbie
 
Member#: 498137
Join Date: Feb 2019
Vehicle:
2003 Impreza WRX
Sonic Yellow

Default Hesitation feeling under boost

Hey everyone, so I noticed this issue a little while ago when the weather was a bit warmer. So, sometimes when I'm in boost and not opening up the throttle more the car seems to kind of hiccup a bit. It doesn't seem like a misfire or anything and I've never had any codes come up for it so I'm not sure what could be causing it. I notice that it really only occurs when the weather is warmer during the spring or summer, but I never have many problems with it during the winter. I talked to a couple of my local car buddies about it and they said it might be a fuel pump issue. If it was a spark plug issue, that should hopefully be corrected since I just changed them 3 weeks ago and haven't had the problem since.
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Old 04-07-2020, 02:21 AM   #2
MedicMoses
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Member#: 470679
Join Date: Jul 2017
Chapter/Region: MWSOC
Location: Michigan
Vehicle:
2018 WRX
Pure Red

Default

Is the AC on? I noticed a similar issue last summer a few time when the AC copressor kicked on during acceleration.
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Old 04-07-2020, 02:54 PM   #3
ericsson
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Member#: 208672
Join Date: Apr 2009
Chapter/Region: TXIC
Location: Houston, TX
Vehicle:
2013 WRX STI Limited
Obsidian Black

Default

Quote:
Originally Posted by EazyDuzIt View Post
Hey everyone, so I noticed this issue a little while ago when the weather was a bit warmer. So, sometimes when I'm in boost and not opening up the throttle more the car seems to kind of hiccup a bit. It doesn't seem like a misfire or anything and I've never had any codes come up for it so I'm not sure what could be causing it. I notice that it really only occurs when the weather is warmer during the spring or summer, but I never have many problems with it during the winter. I talked to a couple of my local car buddies about it and they said it might be a fuel pump issue. If it was a spark plug issue, that should hopefully be corrected since I just changed them 3 weeks ago and haven't had the problem since.
Do you have any mods or is your car oem? My '13 STI has 73k miles and recently found a hole in the turbo inlet. With time, the plastic turbo inlet gives in to normal wear and tear, or it could be loose. This would def. cause hesitation w/out engine codes.
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Old 04-08-2020, 02:15 AM   #4
EazyDuzIt
Scooby Newbie
 
Member#: 498137
Join Date: Feb 2019
Vehicle:
2003 Impreza WRX
Sonic Yellow

Default

Quote:
Originally Posted by ericsson View Post
Do you have any mods or is your car oem? My '13 STI has 73k miles and recently found a hole in the turbo inlet. With time, the plastic turbo inlet gives in to normal wear and tear, or it could be loose. This would def. cause hesitation w/out engine codes.
The only mechanical mods I really have are an improved pitch stop mount, and I have a catback exhaust on. That is a good point on the turbo inlet I'll try and inspect that while I've still got quarantine free time.
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Old 04-08-2020, 08:28 AM   #5
oichan
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Member#: 492327
Join Date: Oct 2018
Location: A car lounge in the midwest
Vehicle:
19 WRX 16 STI
17Mk7R 20Supra 20Forester

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It could be something as easy as old or spoiled gas. Might be worth driving mildly until you rid the fuel in the tank and it fill up.
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Old 04-08-2020, 09:46 AM   #6
Brohymn
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Member#: 512966
Join Date: Mar 2020
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How'd the plugs look when you changed them? If they looked shiny and white you could be running lean and might need to run some top tier fuel with extra detergent to clean the injectors out. If they were oily you could be running rich and might be a leak as stated above which would be exhasperated at higher ambient temperature with less atmospheric oxygen in the air.
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Old 04-08-2020, 09:50 AM   #7
Brohymn
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Member#: 512966
Join Date: Mar 2020
Default

Also could be as simple as a dirty air filter.
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