MDP reading at idle on Evoscan/lean under load

[scrivs]

Hey guys , new to these cars-- have more of an E30 BMW background... Anyways, the Evo 8 I bought from a co worker has run terribly even before I bought it. Its got AMSs gt30r based kit in it with a walbro 255 and 880cc injectors. It runs fine at (very light) part throttle but the moment any sort of load is experienced/when it experiences the slightest bit of boost, she goes full lean... No DTCs... My first few times messing around with Evoscan, I noticed that the MDP (boost) was reading anywhere from 18-20 psi at idle Shouldn't it be reading vacuum? Anyway, before I go out and buy a new MAP sensor, I figured I'd see if any of you guys had any knowledge you could graciously bestow upon me

Thanks!

[JulesBean]

Originally Posted by scrivs

Hey guys , new to these cars-- have more of an E30 BMW background... Anyways, the Evo 8 I bought from a co worker has run terribly even before I bought it. Its got AMSs gt30r based kit in it with a walbro 255 and 880cc injectors. It runs fine at (very light) part throttle but the moment any sort of load is experienced/when it experiences the slightest bit of cd duplication quotes she goes full lean... No DTCs... My first few times messing around with Evoscan, I noticed that the MDP (boost) was reading anywhere from 18-20 psi at idle Shouldn't it be reading vacuum? Anyway, before I go out and buy a new MAP sensor, I figured I'd see if any of you guys had any knowledge you could graciously bestow upon me

Thanks!

Certainly sounds like it could be the pressure sensor..........but lets see what the experts have to say.

[scrivs]

Thanks man, still waiting on those much smarter than myself... From what research I've done, it appears that all the MDP sensor does it monitor EGR system... Doesn't sound like its an input to the ECU for fuel delivery...