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Old 04-12-2016, 11:27 AM   #1
Trudd84
Scooby Specialist
 
Member#: 250706
Join Date: Jun 2010
Chapter/Region: South East
Location: Birmingham, AL
Vehicle:
2004 Impreza WRX
WRB

Default Boost leak testing.

So I'm trying to boost leak my 2004 WRX. I have all the lines blocked off on the inlet. I can build to 5psi with the oil cap off.

Should I have the oil cap off or on? With it off I can feel impair coming through it lightly. Is that normal? I literally can't find a single leak.

All this is happening because the tuner at Phatbotti is saying when I go wot it dives super rich.

Could it be that my maf sensor is just dying? It's the original.

I'm stumped
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Old 04-12-2016, 01:00 PM   #2
Trudd84
Scooby Specialist
 
Member#: 250706
Join Date: Jun 2010
Chapter/Region: South East
Location: Birmingham, AL
Vehicle:
2004 Impreza WRX
WRB

Default Boost leak testing.

So after not finding any leaks with the smoke machine and boost leak tester, we put it on the rack. The whole uppipe is cracked at the flange. So obviously not getting all the exhaust to the turbo.

This is my logic, does it make sense.

My tuner, as well as my wideband, tells me that it dives super rich when I go into 100% throttle.

No boost leaks up top, so we put it on the rack. The uppipe has a big crack around the flange that meets the headers.

So, the maf is reading incoming air and telling the ecu to deliver a certain amount of fuel. The exhaust is leaking and not spoiling up the turbo correctly, given the rpm's, so it's not compressing the correct amount of air, to match the fuel the maf told the ecu to match, so it's under "air'd" hence it runs rich.

I am on the correct path?
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Old 04-12-2016, 01:35 PM   #3
mrsaturn7085
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Member#: 375462
Join Date: Dec 2013
Location: Portland, OR
Vehicle:
2006 Impreza WRX STI
WR Blue

Default

Cracked up-pipe - yes, that will cause some issues...

As long as you are finding problems and fixing them as you go, I'd consider this the correct path.
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