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Weird boost/fuel cut at 0.7 BAR - EVO 4

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Old Sep 6, 2014, 04:23 PM
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Weird boost/fuel cut at 0.7 BAR - EVO 4

]am getting a weird boost cut (I think) when I hit around .7 bar. I lose acceleration and start to back fire if I hold the gas pedal down.

I went to a local mechanic and we checked for boost/vacuum leaks and couldn't find anything. Also took a look at the plugs and he saw signs that my car is probably running lean (in his opinion)He recommended a new tps and boost sensor.
Troubleshooting done so far:
-Changed plugs gapped to .026
-Checked battery and alternator
-Set tps to .07V at idle/ played around with different tps settings
-Ordered a new tps that will arrive soon
Next we did some logging on evo scan.

These are 3rd gear pulls at WOT. Boost builds cleanly then cuts out at .7 BAR

I am at a complete loss here, any help would be appreciated

Weird boost/fuel cut at 0.7 BAR - EVO 4-p89cyxj.png
Weird boost/fuel cut at 0.7 BAR - EVO 4-mbwtyag.png
Weird boost/fuel cut at 0.7 BAR - EVO 4-u6ckxny.png

AFR
Weird boost/fuel cut at 0.7 BAR - EVO 4-kfmytqh.png

LINK to download logs here: https://drive.google.com/folderview?...E0&usp=sharing

Last edited by Pullout1979; Sep 6, 2014 at 10:24 PM.
Old Sep 7, 2014, 12:53 PM
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Bumping with additional logs


Weird boost/fuel cut at 0.7 BAR - EVO 4-erj5zcw.png

Weird boost/fuel cut at 0.7 BAR - EVO 4-l0hgfgm.png

Weird boost/fuel cut at 0.7 BAR - EVO 4-vucqddy.png
Old Mar 26, 2015, 08:21 PM
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Turns out the issue was in the throttle body
Old Mar 26, 2015, 08:22 PM
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The throttle body had a big boost leak from the shaft seals. Got it rebuilt and car runs better than ever
Old Mar 26, 2015, 08:32 PM
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Aby from mil.spec was great. Fast and the TB looks brand new
Old Mar 26, 2015, 08:33 PM
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Thanks
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