well finally got around to it, i checked my codes....im throwing CEL 23, and 41
23 is knock sensor
41 is o2 sensor

my question is,
1)does the knock sensor go bad easily? can this be the reason why im wacking rev limiter at 7 grand? i dont hear any knocking idle is at 1000

2)if i do disable the o2 sensor will this help in performance?

i need help, im thinking of jus taking it out and overhauling it

 

bumpppppppp

 

bummmmppp

 

All stock? What model?

I'll tell you that I have a 94 VX and I had a O2 CEL and was getting average 32-34 MPG. After I bought a new (expensive) 5 wire O2 sensor my gas mileage is back up to 44-47 MPG.

 

oh ya sorry i have a GSR OBD1 in my hatch

 

bummmmmmmmpppppppppppp

 

ANYBODY?!?!!?!?!?!?! need help

 

got a gsr in my hatch too. Did you run the wire for your knock sensor to the proper pin on the ECU. if you didnt your timing will probably be extremely retarded when the revs get high (vtec) to avoid detonation. My 94 hatch had a d16z6 in it with a p28, those engines didnt have a knock sensor, therefore i had to run the wire myself when i did the swap using an obd1 p72 ecu. Once i did run the wire it really woke the car up, the code went away and she pulled a little harder.

as for the o2 sensor i also have that code, but its for the o2 sensor heater, im sure its just a wiring issue that ill look into this weekend and let you know.

 

yup jus came from my friends house who helped me do the swap, and he didnt wire in the knock sensor to the ECU, i have a Z6 in their to so no knock sensor on sohc's...hmm ok

 

if you don't replace your 02 sensor your car will stay in open loop and will run very rich. you need closed loop in order for your car to run correctly.

 

ok fixed the knock sensor, we manually wired it to the ECU which was pretty easy thx to ff-squad thumbs up for them, well now its only throwing code 41 which is o2, car is still revving out at 7000, we checked and theres no clip on the exhaust foir 02 guess the guys took it off with their old exhaust wen replacing it

 

am i in limp mode? due to o2 sensor CEL