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ECU code 91

Old 02-Jul-2008, 07:59 PM
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ECU code 91

Hey guys i recently swapped a b18b into my 00 dx coupe.. Only prob i have is a annoying chech engine light.. Code 91 comes up when i do the paper clip ecu reader lol.. Few diff sites word the code diff but low fuel pressure is what i find.. No problems with idle or anything motor runs great. i can hear my fuel pump kick in. I have a fuel pressure gauge on filter and it says just under 40psi and drops only a few with revs.. Anyone with a good idea of where to start looking how to clear this light?? thanks in advance
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Old 02-Jul-2008, 08:42 PM
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i think your fuel pressure should be about 45 or so
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Old 02-Jul-2008, 08:45 PM
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i think any info i can find on it says stock is 38-40.. thanks for fast response ill look into that more!
I dont have a adjustable flow just a gauge.. How can i even adjust?

Last edited by copasetic; 02-Jul-2008 at 08:50 PM.
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Old 03-Jul-2008, 08:45 AM
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ya any info i can find says stock is 38-40psi
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Old 03-Jul-2008, 07:34 PM
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check your thread on jdmrides. I made a post. I'm too lazy to re-post it here though.
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Old 04-Jul-2008, 10:13 AM
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Ok i donno why i was thinking it dropped psi when revved.. it does go up over 40psi on rev's.. I took the vacuum line off the regulator.. rev's increased but PSI DID NOT!!!... I havent figured out a way to block the return line yet without taking lines apart.. I did just do the filter in spring when my old d-series was running crappy and all was fine for few weeks on that motor..
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