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Issues with MAP sensor

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Old Jul 11, 2018, 04:50 AM
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Issues with MAP sensor

Hello all, I installed an OEM replacement MAP sensor recently, as the one in my 2003 Evo 8 was giving me a CEL code. Anyway, after the change, the code went away, but my boost is getting limited to 14 PSI or so, it used to peak at 19-20 PSI.

Is the MAP sensor responsible for this? I can't figure out what happened. I thought my car had an OEM MAP, but I bought it used in 2004, and it might have had a different MAP than stock, I am not sure anymore... Should I bother getting a 2.5 bar, 3 bar or 4 bar sensor to replace it?
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Old Jul 11, 2018, 07:58 AM
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Post pics of the new MAP sensor and the one it replaced. However, if you've had the car since 2004, I don't think the stock replacement higher bar MAP sensor like OMNI was available back then.

But, the MAP sensor should not effect boost. The stock MAP sensor is only a 1bar sensor, and in "stock" form the ECU only uses the MAP to know when it can use the EGR. Stock boost control is open loop.
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Old Jul 15, 2018, 02:10 PM
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Donít have the old MAP sensor, sorry, this is the new one.
Around the same time, I had a local shop do a clutch install. They might have ****ed some stuff up. But I thought the MBC was ECU controlled...
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Old Aug 8, 2018, 10:59 AM
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Anyone have any ideas how I can get my stock eco back to 19psi?
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Old Aug 8, 2018, 11:14 AM
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do you have an MBC or the stock Boost control System? The stock ECU setup is easy to screw up because its a bleed off configuration. So if you are having boost issues you need to make sure thats hooked up right.
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