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Old 08-07-2012, 12:53 PM   #5
Scooby Newbie
Member#: 257043
Join Date: Sep 2010
Chapter/Region: VIC
Location: Vancouver BC
1993 JDM WRX Wagon


Originally Posted by pmugabi View Post
Maybe the one way valve is leaking?

I used a similar setup for a few months at one time and it worked perfectly. Although it was not a one way valve, it was simply a T inline with the MAP sensor with one side left to the atmosphere (I know unmetered air etc, but it worked fine).

Another option is to put the 97+ MAP sensor, which is what I'm using now, by default it will cut boost at 1.5bar. It has a different electrical socket, so there is a bit of re-wiring to do.
If the valve was leaking I would think replacing it would have done the trick.

As to the 97+ MAP sensor. I would think that using Sensor that max's out at a higher value would require the ecu to have a new or rewritten table of MAP sensor values in the same way that a giant MAF sensor cannot simply be dropped in without a new tune that correctly interprets MAF values from a sensor with a higher max value.

As to the OP question, Do you have any datalogs with MAP sensor readings from before and now?
Is it possible that you have a vacuum leak somwhere else that is effecting the functionality of your one way valve. I dont think the ECU would typically let something doesnt run for months and stop working. If the ECU somehow relearned its usually in 2 weeks not 2 months.
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TommyAtomic is offline   Reply With Quote