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Issues with MAP sensor

Old Jul 11, 2018, 05:50 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, 08:58 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, 03:10 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, 11:59 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, 12:14 PM
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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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Old Sep 29, 2018, 03:10 PM
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Originally Posted by Biggiesacks View Post
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.
Really sorry for not following up. Yeah, my wording is messed up, no I do not have an MBC, it's the stock Boost control System. And I have never messed with it before, so treat me as a noob, what can I do?
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Old Sep 29, 2018, 04:17 PM
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https://www.evolutionm.net/forums/ec...-solenoid.html check out the first couple posts to see how its suppose to be setup.
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Old Sep 30, 2018, 06:39 AM
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Thank you, it is interesting to read. I'll check my set up to see if it's like the pictures and report back

Last edited by CrazyIvan1978; Sep 30, 2018 at 10:12 AM.
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