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Old 03-30-2013, 02:36 AM   #1
skimpreza06
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Default low boost after washing engine bay??

Hey guys so i have a fully stock 2002 wrx and yesterday i decided to clean the engine bay. I used scrubles bubbles, sprayed on a good amount and rinsed the engine bay 2 times without covering anything. I used my hose to spray it down with not a lot of pressure. My boost gauge was indicating between 12 and 15 psi at max before and now it wont go more than 7 psi. What is going on?
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Old 03-30-2013, 05:30 AM   #2
KenSekiguchi
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Have you checked all of your vacuum lines? Another possibility is that you soaked your BCS or the sending unit for your boost gauge. Whenever you wash your engine bay, always cover everything that is connected to your engine harness including the bulk harnesses or anything electronic for that matter.

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Last edited by KenSekiguchi; 03-30-2013 at 05:48 AM.
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Old 03-30-2013, 06:04 AM   #3
07STifastashell
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Quote:
Originally Posted by KenSekiguchi View Post
Have you checked all of your vacuum lines? Another possibility is that you soaked your BCS or the sending unit for your boost gauge. Whenever you wash your engine bay, always cover everything that is connected to your engine harness including the bulk harnesses or anything electronic for that matter.

--
Ken Sekiguchi
Agreed with covering harnesses and anything electronic in the future. Also, avoid directly spraying the alternator. It is best to use a plastic garbage bag to cover up certain areas as mentioned. I agree that you should check vacuum lines first. That would be an easy fix. Good luck!
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Old 03-31-2013, 01:07 PM   #4
skimpreza06
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I checked the vaccum lines and everything is fine. how can i know if its the bcs or not?
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Old 03-31-2013, 07:06 PM   #5
skimobile
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Did you get your air filter soaked?
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Old 04-01-2013, 01:32 AM   #6
808wrx719
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do you have a cold air intake ? I had a buddy that sprayed down his engine bay at a car wash, got some on his k&n cold air and it caused extreme starting issues, boost issues post wash, as well as idling problems. Be careful when getting water in that engine bay!
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Old 04-01-2013, 11:16 PM   #7
skimpreza06
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No i dont have a cold air intake. My car is all stock, but i dont think the air filter got soaked it was in its box well sealed. Its weird the car is idling fine, driving fine, no check engine light , it just wont go over 7 psi no matter how much i give her.
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Old 04-01-2013, 11:22 PM   #8
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and people always wonder why i tell them NOT to DO this
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Old 04-02-2013, 10:18 AM   #9
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.....

Last edited by thehanz123; 04-02-2013 at 01:36 PM.
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Old 04-02-2013, 11:29 AM   #10
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U should post some before and after pics of the engine bay to see if u notice a difference in cleanliness..
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Old 04-02-2013, 11:46 AM   #11
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7psi is wastegate pressure, so something is wrong with the bcs or a vacuum line that its only running wastegate pressure.
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Old 04-02-2013, 12:01 PM   #12
greenplates
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Quote:
Originally Posted by jayman4312
7psi is wastegate pressure, so something is wrong with the bcs or a vacuum line that its only running wastegate pressure.
This.
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Old 04-02-2013, 01:29 PM   #13
skimpreza06
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ok thanks guys, im going to try to get a bcs this week and try it out.
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Old 04-02-2013, 09:18 PM   #14
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Quote:
Originally Posted by jayman4312 View Post
7psi is wastegate pressure, so something is wrong with the bcs or a vacuum line that its only running wastegate pressure.
This, check and make sure all lines are still connected.
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Old 04-04-2013, 02:14 PM   #15
skimpreza06
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hey guys so i checked all lines again, and everything is perfect. I unplugged the bcs and tested it with 2 wires connected to a battery and the bcs was working fine. it was making a click click noise when the current was passing through. Even diconnected the battery and reset the ecu. took it out for a spin and it was the same story still blocks at 7psi. what should i do now?
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Old 04-04-2013, 02:24 PM   #16
thehanz123
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Do you have a restrictor pill??
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Old 04-04-2013, 02:34 PM   #17
skimpreza06
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yes i verified and the restrictor pill is there!
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Old 04-04-2013, 02:38 PM   #18
thehanz123
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Quote:
Originally Posted by skimpreza06 View Post
yes i verified and the restrictor pill is there!
Ever done a boost leak test?
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Old 04-04-2013, 03:02 PM   #19
skimpreza06
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no ive never done a boost leak test, but before i washed it i never had problems.
i read on another thread about disconnecting the wg nipple and driving around to see if it will boost more than 7 psi, and it did, it went over 7 psi but it bucked at one point and i have a check engine light that came on. i will check the code tomorrow to see what it gives me.
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Old 04-04-2013, 03:33 PM   #20
jayman4312
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omg dooooooode do the boost leak test////

you could have pushed a vacuum line off or something weird when you powerwashed your engine bay. "checking all lines" isn't good enough. you can visually see the underside of the turbo inlet, or your y-pipe under your tmic, or see a small pin size hole in a random line.
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Old 04-04-2013, 03:38 PM   #21
skimpreza06
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im guessing boost leak test is my next option. but im telling you guys i did not touch anything nor was the water pressure strong. IMO i think its something electrical that has to do with bcs.
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Old 04-04-2013, 03:43 PM   #22
skimpreza06
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should i change the bcs? even after testing it and hearing it click?
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Old 04-04-2013, 04:01 PM   #23
thehanz123
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Im currently in the same position as you and awaiting to complete the diy boost leak tester...
Its better to not replace parts that are already good because your problem will still be there.
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