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Originally Posted by UNISA JECS
Yes code 34 will casue the bogging and huge power loss and shitty gas milage and will not illuminate a check engine light alone......i'll give you some good advice to help you diagnois a problem with the knock sensor, first you need a digital volt meter and ground one probe and back probe the other to the knock sensor pin in back of the ecu and with the key on engine off you should recieve 2.5 volts if you have a short to ground it will be closer to 0 volts and here the big headache savings info if you do have a shirt to ground it most likely gonna be found in the black plastic casing just above the fuel rail closly look for a thicker gauge black wire with a very slight bulge in it and thats gonna be your short to ground, this is a shielded wire by the way so when you repair it make sure to separate the shielding from teh actually signal wire when solding it back together.
I have personally fixed 5 S13 KA24DE with this problem with the same short to ground and the same exact location +/- 5 inches.
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Could you show some pictures please just so it's totally clear. Thanks