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Weird boost/fuel cut at 0.7 BAR - 96 EVO 4

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Pullout1979

Probationary Member
1
0
Sep 6, 2014
Surrey, BC_Canada
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


LINK TO DOWNLOAD LOGS HERE: https://drive.google.com/folderview?id=0B1okhUkO4dhuN0pqOVY1cldNRE0&usp=sharing

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[DOUBLEPOST=1410119750][/DOUBLEPOST]Additional logs

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Last edited:
Are you sure its a boost problem and not a fuel problem? I'd say you are having too much boost and insufficient fuel supply/pressure to keep up with the air flow. Do you have a wideband? If not, consider getting one so you can see your air/fuel ratio all the time, that should tell you are you running rich or lean. If its a fuel problem you will need to upgrade your fuel supply system (bigger pump,aftermarket fuel pressure regulator, bigger injectors).
p.s. I have the same problem, waiting for the wideband and fuel system upgrades that have been shipped :)
 
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