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I HAVE THE SAME PROBLEM WITH A 1985 AUTOMATIC NON-TURBO. I READ ON ANOTHER WEB SITE THAT SOME GUY HAD REPLACED ALL KINDS OF STUFF AND IT ENDED UP BEING A TRANSMISSION COMPUTER LOCATED IN THE BACK OF THE CAR BEHIND THE SPARE TIRE. SAID HE RESOLDERED THE CONNECTIONS AND THE PROBLEM WENT AWAY. GUESS I NEED TO CHECK IT OUT AND SEE IFIT SOLVES MY PROBLEM. I WILL LET YOU KNOW IF IT HELPS ME OUT.
You need to switch your programming in your apexi safc2, your air to fuel is wrong. There's alot of places on the internet to look. Try typing in eclipse safc settings, check DSM sites there is alot out of them out there. I have had several 1g and 2g DSMs.
I had the same problem with my 87 new yorker. After alot of research and messing around I found it could be a few things. The Map sensor $55 on left side fender, the PCM located inside the air intake tube $50 at junkyard, also make sure that the injector is not stuck open and that both connections on the injector are connected securly.
you have a boostleak, i build gsx's my roommate owns 4g63 power, give me your email er cell and i will send you a boost leak detector you hook up to the turbo inlet and shoot pressurized air into it and if you have a boostleak it will leak out of the engine somewhere that is your leak you replace the seal or hose and blauw the car is fixed, hook me up with blue feedback since im going this far out of my way. the reason you cant get past 2500rpm is because unmeetered air is being let in post maf sensor and the ecu is trying to richen up the engine which is causing the black smoke and probably a strong smell of fuel. my current dsm is the 9th one ive owned =) they break alot lol easy fix though.