Boost gauge bouncing?

orangecurtain · 10-27-2009, 03:30 AM

I recently noticed my boost needle bounces between .05 and .1 mpa when I'm in 3rd gear pedal to the floor, but when I get into 4th with the pedal to the floor the needle stays near .08 mpa without bouncing. Does anyone know what could be causing this symptom? The car is stock as well.

* Registered users of the site do not see these ads.

spinningcain · 10-27-2009, 10:34 AM

Could be a lot of things.Id start with cleaning the maf

cheezycow · 10-27-2009, 11:28 AM

Did you remove the pill from the line when installing the gauge?

dub c · 10-27-2009, 11:42 AM

^those...
if those aren't the case you may need to adjust your WG actuator arm (you shouldn't since im guessing you haven't messed around with that before).
i had this problem for a long time, i ended up having to switch to a new bcs but this may/probably isnt the case with yours.

(The restrictor pill is located in the turbine vac line, so if you didn't touch these vac lines it wont be the pill obviously).

orangecurtain · 10-27-2009, 03:50 PM

I'll buy some maf cleaner today and spray it down.

The gauge was factory installed which is why I posted those stupid mpa units. hahaha
I haven't done anything to the turbo so I'm not sure if adjusting the wastegate arm will do anything, but how would I go about adjusting the arm?

cheezycow · 10-27-2009, 05:08 PM

check all your vac lines for signs of leak or brittle spots.

10-27-2009, 03:30 AM	#1
orangecurtain Scooby Newbie Member#: 211625 Join Date: May 2009 Chapter/Region: SCIC Location: Irvine Vehicle: 2003 WRX Midnight Black	Boost gauge bouncing? I recently noticed my boost needle bounces between .05 and .1 mpa when I'm in 3rd gear pedal to the floor, but when I get into 4th with the pedal to the floor the needle stays near .08 mpa without bouncing. Does anyone know what could be causing this symptom? The car is stock as well. * Registered users of the site do not see these ads.

10-27-2009, 03:50 PM	#5
orangecurtain Scooby Newbie Member#: 211625 Join Date: May 2009 Chapter/Region: SCIC Location: Irvine Vehicle: 2003 WRX Midnight Black	I'll buy some maf cleaner today and spray it down. The gauge was factory installed which is why I posted those stupid mpa units. hahaha I haven't done anything to the turbo so I'm not sure if adjusting the wastegate arm will do anything, but how would I go about adjusting the arm? Last edited by orangecurtain; 10-27-2009 at 08:33 PM.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

10-27-2009, 10:34 AM	#2
spinningcain Scooby Specialist Member#: 176490 Join Date: Apr 2008 Chapter/Region: SWIC Location: Las Vegas Vehicle: 2004 WRX VF39 silver	Could be a lot of things.Id start with cleaning the maf

10-27-2009, 11:28 AM	#3
cheezycow Scooby Newbie Member#: 162062 Join Date: Oct 2007 Chapter/Region: South East Location: Charlotte,NC Vehicle: '04 WRX World Rally Blue	Did you remove the pill from the line when installing the gauge?

10-27-2009, 11:42 AM	#4
dub c NASIOC Supporter Member#: 145069 Join Date: Apr 2007 Chapter/Region: W. Canada Location: Calgary, Alberta, CANADA Vehicle: 2003 impreza wrx WRB	^those... if those aren't the case you may need to adjust your WG actuator arm (you shouldn't since im guessing you haven't messed around with that before). i had this problem for a long time, i ended up having to switch to a new bcs but this may/probably isnt the case with yours. (The restrictor pill is located in the turbine vac line, so if you didn't touch these vac lines it wont be the pill obviously).

10-27-2009, 05:08 PM	#6
cheezycow Scooby Newbie Member#: 162062 Join Date: Oct 2007 Chapter/Region: South East Location: Charlotte,NC Vehicle: '04 WRX World Rally Blue	check all your vac lines for signs of leak or brittle spots.