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Location: Perth WA
Registered: June 2004
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Do we need O2 sensor???
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Sun, 13 February 2005 13:44
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Hey just wondering. I got a stockish 4AGE bigport (JDM) with 4-1 aftermarket extractors (kelhams?). I bought it like this and notice it has no O2 sensor on the extractors like the stock manifold would have. Just wondering do i need a O2 sensor to make the car run alot better, i have a random problem my mechanic friend says that the car is injecting more fuel than usual and gradually thr car wil flood and cant start up for like a day. But yeah do i need a O2 sensor??? THANKS JoHnNy_K
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Location: Montrose, VIC
Registered: May 2002
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Re: Do we need O2 sensor???
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Sun, 13 February 2005 13:56
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If there's meant to be a sensor there, you should use one.
The flooding problem won't be anything to do with that though, sounds like a leaking injector.
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Location: Perth WA
Registered: June 2004
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Re: Do we need O2 sensor???
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Sun, 13 February 2005 14:03
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Why leaking injectors????. Well anyways the mechanic dude reckons its ECU realated which he'll check this week, so which i think having no O2 sensor could be the problem, the ECU doesnt know ma air/fuel ratio thus it injects more fuel , but thanksfor the help anyway i need ideas to find the prob
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Location: brisbane
Registered: December 2004
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Re: Do we need O2 sensor???
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Mon, 14 February 2005 05:28
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if its stock ecu u need one well it will run btter
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I Supported Toymods
Location: Sydney
Registered: December 2002
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Re: Do we need O2 sensor???
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Mon, 14 February 2005 07:19
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Get the oxy sensor installed in your exhaust after the extractors.
It will help with your mixtures... but your problem with starting is something more than just an oxy sensor.
Have you got the right map sensor on the car?
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Location: Wollongong
Registered: January 2005
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Re: Do we need O2 sensor???
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Mon, 14 February 2005 23:58
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I drove my car with NO O2 sensor and NO exhaust manifold once. It was farking loud, but other than that ran fine.
It is a 1996 V6 Vienta, and has 2 O2 sensors fitted standard.
I'm not saying "take your O2 sensor off, you'll be fine" i'm just saying the car can drive without it.
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I supported Toymods
Location: Perth
Registered: May 2002
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Re: Do we need O2 sensor???
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Tue, 15 February 2005 00:03
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The only problem is it'll never be able to go into closed loop and as such, your fuel economy will probably be crap.
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Toymods Vice President
Location: Sydney
Registered: May 2002
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Re: Do we need O2 sensor???
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Tue, 15 February 2005 00:06
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And you should get check engine lights all the time.
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Location: Wollongong
Registered: January 2005
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Re: Do we need O2 sensor???
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Tue, 15 February 2005 00:20
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Joshstix wrote on Tue, 15 February 2005 11:06 | And you should get check engine lights all the time.
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i didn't! WTF?
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Location: Adelaide
Registered: July 2002
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Re: Do we need O2 sensor???
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Tue, 15 February 2005 03:22
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O2 sensor is a two trip fault.
it has to fail or not be connected twice while running to make the ecu light come on, AFAIK
and yes fuel economy will be shit house try less than 300kms out of 40litres in a ae82 100kw 4age without the o2 sensor compared with over 500ks with it
other than that tho it will run, just mega rich.
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Location: Perth WA
Registered: June 2004
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Location: Adelaide
Registered: July 2002
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Re: Do we need O2 sensor???
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Tue, 15 February 2005 04:18
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i dont think the O2 sensor will help the not starting thing.
you might possibly have a leaking injector which is dripping fuel into the cylinder even when the engine is turned off, hence flooding the engine and it not being able to start.
either way get a new o2 sensor they are not expensive, well most arent. then see how that goes if you've still got problems i'd have your injectors cleaned/flow tested. then check the spark plugs/leads/coil/dizzy/battery/alternator
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Location: Melbourne
Registered: July 2004
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Re: Do we need O2 sensor???
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Tue, 15 February 2005 06:13
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I ran my 4ag for a long time without an O2 sensor. When I finally decided to connect it up for no particular reason, made absolutely no difference to anything. I do run a VAF sensor (UK engine loom), but as far as I know, only makes a difference at idle.
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I supported Toymods
Location: Perth
Registered: May 2002
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Re: Do we need O2 sensor???
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Tue, 15 February 2005 06:20
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parrot wrote on Tue, 15 February 2005 14:13 | I ran my 4ag for a long time without an O2 sensor. When I finally decided to connect it up for no particular reason, made absolutely no difference to anything. I do run a VAF sensor (UK engine loom), but as far as I know, only makes a difference at idle.
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If it's working correctly, it'll be working at light loads and cruising when the ECU should switch into closed loop. You'll notice the difference in a big way if you do lots of highway driving.
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I supported Toymods
Location: Perth
Registered: May 2002
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Location: Kita-Ku, Sapporo, Japan
Registered: January 2003
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Re: Do we need O2 sensor???
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Tue, 15 February 2005 07:31
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justcallmefrank wrote on Tue, 15 February 2005 17:20 |
parrot wrote on Tue, 15 February 2005 14:13 | I ran my 4ag for a long time without an O2 sensor. When I finally decided to connect it up for no particular reason, made absolutely no difference to anything. I do run a VAF sensor (UK engine loom), but as far as I know, only makes a difference at idle.
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If it's working correctly, it'll be working at light loads and cruising when the ECU should switch into closed loop. You'll notice the difference in a big way if you do lots of highway driving.
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zactly... funny how the same thing needs to be said a few times before it sinks in
for my megasquirt, i have O2 closed loop working:
above 77 degrees C (coolant)
above 2000rpm
below 65kpa (absolute manifold pressure)
if any of those conditions are not met, it goes out of closed loop.. it basically means only highway driving, and steady/trailing throttle. it can make a big difference tho, but if your tuning is close, then it might be only 5% difference.
Cya, Stewart
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Location: Bottom of the hill, Sydney
Registered: April 2004
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Re: Do we need O2 sensor???
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Tue, 15 February 2005 10:23
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Johnny_K wrote on Tue, 15 February 2005 15:11 | .SO i guess if its running mega rich (when cold you can see fuel being spat out of ma exaust)
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Are you sure it's fuel and not just condensation/water. If it is fuel then I think you will also need a new catalytic converter.
Brad
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Location: Melbourne
Registered: July 2004
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Re: Do we need O2 sensor???
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Wed, 16 February 2005 01:00
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The U.K. cars don't actually run an O2 sensor. As I said, they do have a VAF sender which I was of the impression only affected idle quality. Not sure how U.K. cars handle cruising conditions. I have used both a U.K. supplied standard ECU plus a japanese standard ECU with no discernible change.
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