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Old 01-15-2014, 01:30 PM   #21
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OK thanks Scotty and 18psi I will check all of that today.
My injectors are denso injectors brand new only 200 miles on them

But when I pull intake I will check them
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Old 01-15-2014, 01:32 PM   #22
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Turbo compressor and turbine are clear.
manifold has normal sludge build up nothing overly excessive
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Old 01-15-2014, 01:42 PM   #23
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is it lean when its stumbling at idle too or just when you rev it/
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Old 01-15-2014, 01:51 PM   #24
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Its weird sometimes it will idle fine at 14:1 and then I rev it barely and it will go lean.

If I ease into throttle it will stay 14:1 not in gear until I hit 2k rpm

And then sometimes it will go lean right when I start it. Gets worse the warmer engine gets
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Old 01-15-2014, 01:57 PM   #25
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might be a malfunctioning tps or maf sensor too, but with the crappy fic I dunno
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Old 01-15-2014, 01:59 PM   #26
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Fix has tips sensor output percentage and it shows it to be working.
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Old 01-15-2014, 01:59 PM   #27
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FIC*
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Old 01-15-2014, 02:00 PM   #28
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And my MAF voltage isn't spiking or diving. I did notice my voltage drops to 12.1 when it wants to die at idle
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Old 01-15-2014, 02:05 PM   #29
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I'm pretty set on the intake manifold leaking somwhere
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Old 01-15-2014, 02:07 PM   #30
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Possible, but a vacuum leak past maf normally makes the rpm jump up, not dip down. although if its big enough to cause the car to run uber lean I guess it could dip town too

this goes back to my suggestion of doing a boost leak test
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Old 01-15-2014, 02:10 PM   #31
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What's best way to do boost leak test I've seen it done couple ways
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Old 01-15-2014, 02:12 PM   #32
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there is only one way to do a boost leak test properly.

what ways did you see?
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Old 01-15-2014, 02:21 PM   #33
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Seen one guy blow smoke into engine bay and smoke migrated to leak. Didn't work as well as pressurizing pipes with air and capped off coupler on turbo inlet.
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Old 01-15-2014, 02:38 PM   #34
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Well ideally a smoke test is best. You pressurise the piping with smoke and its ez-pz. or just pressurise with air and listen/feel for the leaks. or pressurise with air and spray all places that can potentially leak with water or soapy/bubbly water.

either way
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Old 01-15-2014, 02:40 PM   #35
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OK I think its a combo of problems
Thanks guys gave me good basis to go from
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Old 01-15-2014, 10:02 PM   #36
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Pulled the head and I think it was head gasket car had 140k on it and head gasket looked pretty rough and I didn't even have to pry head of as soon as I loosened head bolts it came loose
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Old 01-16-2014, 11:10 AM   #37
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