Rumble noise from engine on cold start

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Rumble noise from engine on cold start

Postby 776091 » Sun Jul 02, 2017 2:02 am

Hey guys, my apologies if this was answered before. Moderator can move it in the right thread.

I have an 07 Liberty GT SpecB. On cold start, there's a rumble noise that sounds exactly as if I have a custom exhaust of some sort (which I don't), only it comes from the engine. Is this something normal or I should get it checked?

The sound goes away quickly (in less than a minute). This is my first turbo and first Subaru, so forgive me if it's nonsense. :oops:

Thanks for any input, appreciate it.
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Re: Rumble noise from engine on cold start

Postby vinshonz » Sun Jul 02, 2017 6:01 pm

secondary air pump for emissions
2008 Liberty GT Tuned by STi 27 of 250 made
PnP VF52, AVO TBE into STi mufflers, AVO panel filter, Mishimoto TMIC, Turbosmart Kompact BOV, Kobe Silicone Intake + SFB, Kobe 340LPH pump,
Tuspeed 3Port, Exedy HD + lightened flywheel, some Whiteline bits & Corgiwerx bits - KiDo tuned

2007 WRX Tuned by STi 35 of 200 made
STi Spec C TMIC+ProcessWest splitter, AVO TBE, X3E Silicone Intake, APS CAI, TurboSmart Kompact, Walbro, GrimmSpeed 3 Port, DEFI gauges
TD05-18G 198.5kw on RTRs Dyno - SOLD
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Re: Rumble noise from engine on cold start

Postby 776091 » Sun Jul 02, 2017 6:32 pm

Thanks for your quick reply mate.

Does this mean the pump is on its way out? Need to get it fixed or replaced asap?

EDIT: ignore the questions guys, just found a thread explaining about it. My appologies...
776091
 
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Location: Noble Park North VIC
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Re: Rumble noise from engine on cold start

Postby vinshonz » Mon Jul 03, 2017 4:50 pm

haha no worries

from what i know its turns on for about 30secs-60 secs to help the catalytic converter do its job

my car also rumbles alot louder for that duration, nothing to worry about
2008 Liberty GT Tuned by STi 27 of 250 made
PnP VF52, AVO TBE into STi mufflers, AVO panel filter, Mishimoto TMIC, Turbosmart Kompact BOV, Kobe Silicone Intake + SFB, Kobe 340LPH pump,
Tuspeed 3Port, Exedy HD + lightened flywheel, some Whiteline bits & Corgiwerx bits - KiDo tuned

2007 WRX Tuned by STi 35 of 200 made
STi Spec C TMIC+ProcessWest splitter, AVO TBE, X3E Silicone Intake, APS CAI, TurboSmart Kompact, Walbro, GrimmSpeed 3 Port, DEFI gauges
TD05-18G 198.5kw on RTRs Dyno - SOLD
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Posts: 201
Joined: Tue Mar 22, 2016 6:53 am
Location: SE MELB
Car: 2008 Liberty GT TunedBySTi
Real name: Vincent

Re: Rumble noise from engine on cold start

Postby tom_kauf » Wed Jul 26, 2017 12:18 pm

If it annoys you, the system can be blocked off. I did it and now love the lack of Diesel sound on cold starts. So much nicer!
I can post a link to the US Forum guide if you're interested.

Parts are cheap but it's not an easy job, because a section of the Exhaust has to come off, and the turbo, but it's worth it in my opinion.
The pump is only used to trick the emissions test. And after 30-60sec it does nothing anyway, so I don't feel bad that it does much environmental harm.
[Stealth & Speed - Comfort & Practicality]: My 2008 MY09 GT SpecB Wagon - Manual 185,000km
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