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Codes 24 And 31


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hello people

92 ls400 is giving codes 24 and 31 with no check engine light on when vehicle is running. put another mass air flow meter on and same codes come up. this is where my situation with the car is at. don`t understand what is happening. could a bad isc valve be causing these codes to come up. it idles fine but reving not above 800 rpms and push accelarter further it dies. cannot clear the codes with even removing the efi fuse. could a short in wiring of afm connector cause this affect. maybe a wire broke(kinked) inside casing. please somebody help me if you can. i`m starting to hate my car. Just went outside put efi fuse back in after 30 minutes and didn`t even start the car just checked for codes got 24 and 31 again.

Big thanks


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