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Old 08-26-2013, 11:58 AM   #1
steezybjecas
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1998 forester ej20k

Default v3 sti pre boost cut 10 psi

Hello this is my first thread and i really could use some advice....I am new to the new turbo engine scene comming from a 98 forester that i just recently swapped in a v3 sti engine and am having a weird boost cut problem everytime the car makes about 10 psi it is a direct injector or fuel cut from the ecu and i cant figure out why i assume stock boost cut would be higher bc it cuts before the engine even can get up in the rpms
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Last edited by steezybjecas; 08-26-2013 at 11:59 AM. Reason: spelling
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Old 08-26-2013, 12:10 PM   #2
Jaxx
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The 93 Imp W/EJ20K
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could be, the map sensor do you have access to evoscan or a ssm

read this thread
http://forums.nasioc.com/forums/show....php?t=1975703
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Old 08-26-2013, 12:26 PM   #3
steezybjecas
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No unfortunately i do not have access to either one of those scan tools just the basic obd and obd2 ones which i cant seem to get to link up with my ecu would that be something a shop that tunes might have ?
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Old 08-27-2013, 03:56 AM   #4
pmugabi
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The OBD2 tools will not link up with your OBD1 ECU. You will need the correct Evoscan cable and software to read the map sensor values. Or alternatively check it out by using the factory service manual.
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Old 08-27-2013, 01:38 PM   #5
Jaxx
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The 93 Imp W/EJ20K
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+1 for what he said ..
iirc you connect the diagnostic plug then observer the blink code

put the blink code in to google ...

the hard wired cable setup+evo scan has been a great too for me
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Old 08-27-2013, 07:29 PM   #6
steezybjecas
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i tried the blink codes but the problem is it throws almost every code there is like 20 of them its weird the car runs the same with or without the map sensor even plugged in... im using the knock sensor from the forester motor on the sti could that be triggering a cut somehow?
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Old 08-29-2013, 02:06 PM   #7
steezybjecas
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is it bossible that the it just might need to be tuned or do i have a bad sensor or something else wired up wrong bc it runs the same with the map sensor plugged in or not
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Old 08-31-2013, 09:27 AM   #8
Jaxx
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did you miss the sensor ground ?
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Old 08-31-2013, 09:32 AM   #9
steezybjecas
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1998 forester ej20k

Exclamation

When I check the ground at idle on the map sensor it has one and the signal is what it says it should be .....the other thing I'm thinking is I have all the grounds going to the same spot I think I'm going to try and split them into there own individual grounds
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Old 09-07-2013, 03:07 PM   #10
98stifoz
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hope you got your boost cut situation solved.....any chance you could help me with my swap? i have a 98 forester s (dohc) mt and bought a 98 jdm gc8 clip. it will be here Tuesday and i was hoping to get started on the wiring aspect.
this will be my first subby swap and first jdm.
please any help would be greatly appreciated as im not finding much accurate info.
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Old 09-12-2013, 08:05 AM   #11
steezybjecas
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im starting to think the boost cut might be a failsafe mode due to the cel but im still not sure......either that or i have a bad computer im starting to run out of options im looking into a power fc to rule out the computer options and then shut down the codes and see if it still cuts
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