Turbo Inlet leak symptoms?

Mohammadov · 07-11-2011, 11:35 AM

Dear all,

I got my defi boost gauge read at idle 15 hg or -6.7 PSI,which my tuner and others said it shall be from 17hg-21hg.

I pressurized the throttle body,fixed all leaks i found from bov,to vacuum lines..and it went up from 14hg to 15 hg.

installed new uppipe,with new gaskets,with same result!

Will a turbo inlet leak affect the vacuum reading?my mechanic didnt pressurized the turbo inlet,as there is oil lines with the grimmspeed AOS.

final note,i traveled 250 miles to sea level city,and came back to my home,and the boost gauge reading was 21hg@idle!!which makes me crazy.
other day returned back to 15 hg

Thanks in advance.

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

the suicidal eggroll · 07-11-2011, 11:42 AM

A leak in the turbo inlet would throw off your AFR, which would only affect your MRP at idle if the AFR was off enough where the ECU had to open the throttle plate more to keep the engine from dying. Easiest way to see if you have a torn turbo inlet is to look at your AFR Learning A-D, they'll all be positive with the higher ranges (C-D) being larger than the lower ranges (A-B).

What altitude are you at? At high altitude your MRP at idle will be very high, mine sits around -6-7 psi normally at 5300 ft, in Texas (close to sea level) it would usually sit closer to -10 psi.

kpluiten · 07-11-2011, 12:33 PM

You will pull in unmetered air on any post MAF leak. A post MAF, pre-turbo leak is perhaps the worst spot to have a leak as it will cause you to run very lean, especially when that turbo starts sucking.

Mohammadov · 07-11-2011, 02:28 PM

Quote:

Originally Posted by the suicidal eggroll

A leak in the turbo inlet would throw off your AFR, which would only affect your MRP at idle if the AFR was off enough where the ECU had to open the throttle plate more to keep the engine from dying. Easiest way to see if you have a torn turbo inlet is to look at your AFR Learning A-D, they'll all be positive with the higher ranges (C-D) being larger than the lower ranges (A-B).

What altitude are you at? At high altitude your MRP at idle will be very high, mine sits around -6-7 psi normally at 5300 ft, in Texas (close to sea level) it would usually sit closer to -10 psi.

I am about 3200 ft.
When i was at sea level it was about 22hg.
now in my city it reads -6.7 MRP,i dont know if its okey?!
about lean or rich,its just 14.5 on WBO2 on idle and on WOT as tuned 10.9-11.1

Mohammadov · 07-11-2011, 02:29 PM

Quote:

Originally Posted by kpluiten

You will pull in unmetered air on any post MAF leak. A post MAF, pre-turbo leak is perhaps the worst spot to have a leak as it will cause you to run very lean, especially when that turbo starts sucking.

14.2-14.5 on idle,and on WOT its 10.9-11.2 (Bigger TMIC)/

the suicidal eggroll · 07-11-2011, 02:37 PM

Could be normal for your altitude. I'm a bit higher than you, but that's close to what mine reads. When the engine's cold mine's at more like -5 psi.

Mohammadov · 07-11-2011, 03:34 PM

Quote:

Originally Posted by the suicidal eggroll

Could be normal for your altitude. I'm a bit higher than you, but that's close to what mine reads. When the engine's cold mine's at more like -5 psi.

same as you!

thenewrick · 07-11-2011, 07:06 PM

I had a bad turbo inlet tube that was worn out at the end and dripped oil down inside it, symptom was smoke out the exhaust especially at 1st start up of the day, or after a long time spent idle 5+ minutes.

ctk333 · 07-29-2012, 11:37 AM

would a TIH leak affect the lower rpm range? causing it to splutter..

the suicidal eggroll · 07-29-2012, 12:06 PM

TIH?

A leak in the turbo inlet will cause AFR and hesitation problems across the board.

dietzy5 · 09-14-2012, 10:16 AM

not trying to bump an old thread, more of an FYI for others

I had a loose turbo inlet pipe....
occasionally I had an engine running lean CEL, the motor would idle fine, but had horrible hesitation at lower RPMs and stuttered once boost started to build.

a new hose clamp and a quick reset ECU and its night and day

danger1138 · 09-20-2012, 01:14 PM

Quote:

Originally Posted by dietzy5

not trying to bump an old thread, more of an FYI for others

I had a loose turbo inlet pipe....
occasionally I had an engine running lean CEL, the motor would idle fine, but had horrible hesitation at lower RPMs and stuttered once boost started to build.

a new hose clamp and a quick reset ECU and its night and day

I think i may be having same symptoms and it may be a result of turbo inlet. Its seems to not be dead on the turbo compressor. Just a tad off like the gap between the turbo and the left side of inlet mouth is a cm off.

Clean_ej25 · 11-18-2012, 09:49 PM

i check mine and its ripped i have to replace it my gas is going like crazy ill put 60$ to fill up and next two days it will be half close to quarter tank i know its not normal and i also know they take good amount of gas if you get on it . i have stayed under boost and still goes that quick i got a running to rich code p0172 cleared it with the cobb and it blew smoke from the exhuast all unburned fuel smell bad. could it be that the maf map is reading unmetered air and compensating by throwing more fuel plus my bigg size injectors dont help? stage 2 on cobb is deff not the right tune fo the situation right now gotta replace turbo inlet !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !ASAP

07-11-2011, 11:35 AM	#1
Mohammadov * Banned * Member#: 110160 Join Date: Mar 2006 Location: STI Engine Vehicle: 2005 STI+JDM V7 Swap WRB	Turbo Inlet leak symptoms? Dear all, I got my defi boost gauge read at idle 15 hg or -6.7 PSI,which my tuner and others said it shall be from 17hg-21hg. I pressurized the throttle body,fixed all leaks i found from bov,to vacuum lines..and it went up from 14hg to 15 hg. installed new uppipe,with new gaskets,with same result! Will a turbo inlet leak affect the vacuum reading?my mechanic didnt pressurized the turbo inlet,as there is oil lines with the grimmspeed AOS. final note,i traveled 250 miles to sea level city,and came back to my home,and the boost gauge reading was 21hg@idle!!which makes me crazy. other day returned back to 15 hg Thanks in advance. * Registered users of the site do not see these ads.

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

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
power steering pressure line leak after turbo inlet install	StarDogChampion	Factory 2.0L Turbo Powertrain	21	05-11-2012 05:31 PM
Boost Leak Symptoms Without the Leak	XanRules	Factory 2.0L Turbo Powertrain	49	06-22-2010 02:09 AM
Symptoms after turbo inlet install	lordizzy626	Newbies & FAQs	7	03-05-2010 09:11 AM
Turbo Inlet Leak...Oil Problem	SpADeZ_WRX	Factory 2.5L Turbo Powertrain	7	05-28-2008 05:17 PM
Turbo inlet leak? Help me out quick.	0260B4U	Factory 2.0L Turbo Powertrain	3	08-02-2003 03:08 AM

07-11-2011, 11:42 AM	#2
the suicidal eggroll Scooby Guru Member#: 51961 Join Date: Jan 2004 Chapter/Region: RMIC Location: Broomfield, CO Vehicle: 2005 STi 2012 WRX	A leak in the turbo inlet would throw off your AFR, which would only affect your MRP at idle if the AFR was off enough where the ECU had to open the throttle plate more to keep the engine from dying. Easiest way to see if you have a torn turbo inlet is to look at your AFR Learning A-D, they'll all be positive with the higher ranges (C-D) being larger than the lower ranges (A-B). What altitude are you at? At high altitude your MRP at idle will be very high, mine sits around -6-7 psi normally at 5300 ft, in Texas (close to sea level) it would usually sit closer to -10 psi.

07-11-2011, 12:33 PM	#3
kpluiten Scooby Guru Member#: 120273 Join Date: Jul 2006 Chapter/Region: SWIC Location: AZ Vehicle: 06 WRBWRXWGN Now with 100% more Spec-C	You will pull in unmetered air on any post MAF leak. A post MAF, pre-turbo leak is perhaps the worst spot to have a leak as it will cause you to run very lean, especially when that turbo starts sucking.

07-11-2011, 02:37 PM	#6
the suicidal eggroll Scooby Guru Member#: 51961 Join Date: Jan 2004 Chapter/Region: RMIC Location: Broomfield, CO Vehicle: 2005 STi 2012 WRX	Could be normal for your altitude. I'm a bit higher than you, but that's close to what mine reads. When the engine's cold mine's at more like -5 psi.

07-11-2011, 07:06 PM	#8
thenewrick Scooby Specialist Member#: 240649 Join Date: Mar 2010 Chapter/Region: South East Location: Tallahassee Vehicle: 2004 WRX STi WRB	I had a bad turbo inlet tube that was worn out at the end and dripped oil down inside it, symptom was smoke out the exhaust especially at 1st start up of the day, or after a long time spent idle 5+ minutes.

07-29-2012, 11:37 AM	#9
ctk333 Scooby Newbie Member#: 304496 Join Date: Dec 2011	would a TIH leak affect the lower rpm range? causing it to splutter..

07-29-2012, 12:06 PM	#10
the suicidal eggroll Scooby Guru Member#: 51961 Join Date: Jan 2004 Chapter/Region: RMIC Location: Broomfield, CO Vehicle: 2005 STi 2012 WRX	TIH? A leak in the turbo inlet will cause AFR and hesitation problems across the board.

09-14-2012, 10:16 AM	#11
dietzy5 Scooby Newbie Member#: 51567 Join Date: Dec 2003 Location: Pittsburgh Vehicle: 2002	not trying to bump an old thread, more of an FYI for others I had a loose turbo inlet pipe.... occasionally I had an engine running lean CEL, the motor would idle fine, but had horrible hesitation at lower RPMs and stuttered once boost started to build. a new hose clamp and a quick reset ECU and its night and day

11-18-2012, 09:49 PM	#13
Clean_ej25 Scooby Newbie Member#: 333434 Join Date: Sep 2012	i check mine and its ripped i have to replace it my gas is going like crazy ill put 60$ to fill up and next two days it will be half close to quarter tank i know its not normal and i also know they take good amount of gas if you get on it . i have stayed under boost and still goes that quick i got a running to rich code p0172 cleared it with the cobb and it blew smoke from the exhuast all unburned fuel smell bad. could it be that the maf map is reading unmetered air and compensating by throwing more fuel plus my bigg size injectors dont help? stage 2 on cobb is deff not the right tune fo the situation right now gotta replace turbo inlet !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !ASAP