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Old 04-25-2014, 10:18 PM   #1
Sandy93
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Member#: 348126
Join Date: Feb 2013
Default Feel like a boost leak im sure its not

I'm new to this I have had my car for like almost two years now

The mod are Intake Down pipe Sti top mount 119000 miles No TUNE GOING TO GET THAT.. WANT TO FIX WHATS WRONG FRIST, and have a cel for my front 02 sensor

So what's wrong is I have lost all my boost and also sputters when under load boost might hit just 5 psi.. BUT! When I reset the ecu there goes the boost a little lag because of the intake and no TUNE car idle okay had to change a coil pack a few weeks ago was miss hiring but no code was on so I just changed one and it stopped, going to get the other three before I tune the car.. But after that that's when I been having this boost problem

I think it just might be a knock and it cuts the boost/power down like a safe mood?
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Old 04-26-2014, 07:11 PM   #2
Agonist
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Chapter/Region: NESIC
Location: Southcoast MA
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05 WRX
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You shouldn't be going into boost without a proper tune for those mods or atleast i sure wouldn't :\ sounds to me like the lack of a tune may very well be your problem
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Old 04-26-2014, 07:32 PM   #3
Shiftace420
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A loose part rattling on the engine or exhaust can send false knock signals but.... Sounds like you need to replace that o2

Your front o2 sensor is very important for tuning and the ecu uses it to adjust fuel/air mixtures. With a code for it your gonna get problems, including but not limited to your lack of boost. Your ECU is saving your engine because it dectected a knock. The knock could have come from improper a/f ratio from the faulty o2 signal. Sometimes the sensor wont produce a code but will cause drivability issues.

What year is the car? Makes a difference and we really need to know that.
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Old 04-28-2014, 02:39 PM   #4
Sandy93
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Quote:
Originally Posted by Shiftace420 View Post
A loose part rattling on the engine or exhaust can send false knock signals but.... Sounds like you need to replace that o2 Your front o2 sensor is very important for tuning and the ecu uses it to adjust fuel/air mixtures. With a code for it your gonna get problems, including but not limited to your lack of boost. Your ECU is saving your engine because it dectected a knock. The knock could have come from improper a/f ratio from the faulty o2 signal. Sometimes the sensor wont produce a code but will cause drivability issues. What year is the car? Makes a difference and we really need to know that.
02 Bugeye Wrx, yea I'm going to get a new 02 sensor and tune hope everything work out thanks for the reply
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Old 04-30-2014, 01:10 AM   #5
evobully
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Lack of tune might be the issue but make sure your ic piping is all secure and damage free
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