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Old 07-11-2011, 11:35 AM   #1
Mohammadov
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Default 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.
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Old 07-11-2011, 11:42 AM   #2
the suicidal eggroll
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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.
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Old 07-11-2011, 12:33 PM   #3
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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.
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Old 07-11-2011, 02:28 PM   #4
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Quote:
Originally Posted by the suicidal eggroll View Post
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
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Old 07-11-2011, 02:29 PM   #5
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Quote:
Originally Posted by kpluiten View Post
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)/
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Old 07-11-2011, 02:37 PM   #6
the suicidal eggroll
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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.
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Old 07-11-2011, 03:34 PM   #7
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Quote:
Originally Posted by the suicidal eggroll View Post
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!
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Old 07-11-2011, 07:06 PM   #8
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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.
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Old 07-29-2012, 11:37 AM   #9
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would a TIH leak affect the lower rpm range? causing it to splutter..
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Old 07-29-2012, 12:06 PM   #10
the suicidal eggroll
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TIH?

A leak in the turbo inlet will cause AFR and hesitation problems across the board.
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Old 09-14-2012, 10:16 AM   #11
dietzy5
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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
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Old 09-20-2012, 01:14 PM   #12
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Quote:
Originally Posted by dietzy5 View Post
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.
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Old 11-18-2012, 09:49 PM   #13
Clean_ej25
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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
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