wideband reading keeps jumping around - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

nicku · 02-11-2008, 08:54 PM

Hi all,
Today I did my engine back wires clean up. I kinda just untape all the wires and retape it. somehow I found out there is a vaccum hose on the charcoa canister which connect to a nipple under the throttle body was off. So I connected it back in and made sure its tight. but somehow, my wideband starts acting weird. at idling, it jumps from 12 to low 16. sometimes it stays around high 12 to low 13 for a while, then just jump to 14 and 15 and stays around 15-high 16 for a while. I dont know is it because of the vaccum hose. or what's going on?

my setup is s15 t28, redtop, stock boost, stock injector

nicku · 02-12-2008, 12:02 AM

and i found out one thing. when the wideband reading goes higher, the battery voltage on the safc says the battery voltage goes lower to 13.5 and it goes back up to 14.2

johngriff · 02-12-2008, 12:04 AM

which model wideband do you have?

nicku · 02-12-2008, 12:09 AM

its plx m300

96Turbo · 02-12-2008, 12:10 AM

st cloud represent!! I never see any nice 240s back home. I'm about an hour southwest of you. What's the car scene like in SC? Any drifting events etc? Or do u just keep it on the streets? Sorry to interrupt your thread. hit me up in a PM.

nicku · 02-12-2008, 10:00 AM

could it be a bad grounding? because I did move one grounding which was on the on side of intake manifold, and now to the other side of intake manifold. or maybe the injector connectors order is wrong? The number one connector and number two connector should not be messed up since they are the first longest and the second longest. I am afraid I messed up the order for number 3 and 4. What would happen if I mess up the order of the connectors? and the two wires on the connector, one of them is red. the other one is different by each connector. The number three on my is having red and green wires. And the number 4 is red and blue wires. Is it correct?

nicku · 02-12-2008, 05:41 PM

any idea?? ???

mayco_86 · 02-12-2008, 06:02 PM

My aem wideband is doing the same. I also dont understand it. What numbers was yours showing before you hooked up the hose.

nicku · 02-12-2008, 06:16 PM

before I hook up the hose, the idle was about high 14 to low 15. but now the idle is jumping all over the place....i dont know what to do!!!

02-11-2008, 08:54 PM	#1
nicku Zilvia Junkie Join Date: Aug 2007 Location: St. Cloud, MN Age: 40 Posts: 545 Trader Rating: (0) Feedback Score: 0 reviews	wideband reading keeps jumping around Hi all, Today I did my engine back wires clean up. I kinda just untape all the wires and retape it. somehow I found out there is a vaccum hose on the charcoa canister which connect to a nipple under the throttle body was off. So I connected it back in and made sure its tight. but somehow, my wideband starts acting weird. at idling, it jumps from 12 to low 16. sometimes it stays around high 12 to low 13 for a while, then just jump to 14 and 15 and stays around 15-high 16 for a while. I dont know is it because of the vaccum hose. or what's going on? my setup is s15 t28, redtop, stock boost, stock injector

02-12-2008, 12:04 AM	#3
johngriff Post Whore! Join Date: Jun 2004 Location: Long Beach, CA Posts: 4,103 Trader Rating: (4) Rides Gallery: johngriff Feedback Score: 4 reviews	which model wideband do you have? __________________ [email protected]

02-12-2008, 12:02 AM	#2
nicku Zilvia Junkie Join Date: Aug 2007 Location: St. Cloud, MN Age: 40 Posts: 545 Trader Rating: (0) Feedback Score: 0 reviews	and i found out one thing. when the wideband reading goes higher, the battery voltage on the safc says the battery voltage goes lower to 13.5 and it goes back up to 14.2

02-12-2008, 12:09 AM	#4
nicku Zilvia Junkie Join Date: Aug 2007 Location: St. Cloud, MN Age: 40 Posts: 545 Trader Rating: (0) Feedback Score: 0 reviews	its plx m300

02-12-2008, 12:10 AM	#5
96Turbo Zilvia FREAK! Join Date: Nov 2007 Location: AZ Age: 36 Posts: 1,315 Trader Rating: (11) Feedback Score: 11 reviews	st cloud represent!! I never see any nice 240s back home. I'm about an hour southwest of you. What's the car scene like in SC? Any drifting events etc? Or do u just keep it on the streets? Sorry to interrupt your thread. hit me up in a PM.

02-12-2008, 10:00 AM	#6
nicku Zilvia Junkie Join Date: Aug 2007 Location: St. Cloud, MN Age: 40 Posts: 545 Trader Rating: (0) Feedback Score: 0 reviews	could it be a bad grounding? because I did move one grounding which was on the on side of intake manifold, and now to the other side of intake manifold. or maybe the injector connectors order is wrong? The number one connector and number two connector should not be messed up since they are the first longest and the second longest. I am afraid I messed up the order for number 3 and 4. What would happen if I mess up the order of the connectors? and the two wires on the connector, one of them is red. the other one is different by each connector. The number three on my is having red and green wires. And the number 4 is red and blue wires. Is it correct?

02-12-2008, 05:41 PM	#7
nicku Zilvia Junkie Join Date: Aug 2007 Location: St. Cloud, MN Age: 40 Posts: 545 Trader Rating: (0) Feedback Score: 0 reviews	any idea?? ???

02-12-2008, 06:02 PM	#8
mayco_86 Zilvia Addict Join Date: Mar 2006 Location: Cali Posts: 988 Trader Rating: (9) Feedback Score: 9 reviews	My aem wideband is doing the same. I also dont understand it. What numbers was yours showing before you hooked up the hose.

02-12-2008, 06:16 PM	#9
nicku Zilvia Junkie Join Date: Aug 2007 Location: St. Cloud, MN Age: 40 Posts: 545 Trader Rating: (0) Feedback Score: 0 reviews	before I hook up the hose, the idle was about high 14 to low 15. but now the idle is jumping all over the place....i dont know what to do!!!