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adamb131
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Location:
NSW
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September 2003
 
What happens with no Oxy sensor Fri, 02 July 2004 01:25 Go to next message
Can I drive my car without the oxy sensor hooked up?
What will happen?
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adamb131
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NSW
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September 2003
 
Re: What happens with no Oxy sensor Fri, 02 July 2004 01:31 Go to previous messageGo to next message
More info:
Custom extractors off a 4ag with carbs... I want to use them on my car but they have no oxy sensor inlet.
Can I fit them and drive the car (without the oxy sensor) to a guy who is gonna place an fitting into my engine pipe.
Will the car go or will it cause any damage...
Oh they are going on a early GZE.
Thanks
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Aust162
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Location:
Melb, Victoria
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April 2004
Re: What happens with no Oxy sensor Fri, 02 July 2004 01:38 Go to previous messageGo to next message
u can drive it without O2 sensor but it stuffs up ur mixtures and u get real bad fuel economy.
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joecoolmk2
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Registered:
June 2004
Re: What happens with no Oxy sensor Fri, 02 July 2004 01:40 Go to previous messageGo to next message
the oxy sensor tells the ecu what air/fuel mixture the engine needs, if it isn't there, it won't work properly or not at all. either way, refit an oxy sensor, it needs to be in a location where it gets exhaust from all cylinders.
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ed_ma61
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May 2002
Re: What happens with no Oxy sensor Fri, 02 July 2004 01:40 Go to previous messageGo to next message
the people in the car behind you will have tears in their eyes at the lights...
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adamb131
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September 2003
 
Re: What happens with no Oxy sensor Fri, 02 July 2004 01:43 Go to previous messageGo to next message
ed_ma61 wrote on Fri, 02 July 2004 11:40

the people in the car behind you will have tears in their eyes at the lights...

Is that from laughter or breathing my tasty emmisions or both???
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ed_ma61
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Re: What happens with no Oxy sensor Fri, 02 July 2004 01:45 Go to previous messageGo to next message
rich as shit exhaust Nod
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adamb131
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NSW
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September 2003
 
Re: What happens with no Oxy sensor Fri, 02 July 2004 01:47 Go to previous messageGo to next message
Thanks... I just gotta drive it about 12k's to my mates workshop. Was just worried about breaking down or wrecking something along the way.
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Norbie
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Brisbane
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May 2002
Re: What happens with no Oxy sensor Fri, 02 July 2004 04:05 Go to previous messageGo to next message
It won't cause any problems apart from worse than average fuel economy. And I doubt it will run "rich as shit", ie black smoke from the exhaust, since the ECU only trims the mixtures by a few % in closed-loop mode.
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Chris Davey
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Location:
sunny coast, qld
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October 2002
Re: What happens with no Oxy sensor Fri, 02 July 2004 04:34 Go to previous messageGo to next message
i drove my car with no 02 sensor for a little while because the mechanic was too lazy to refit it Rolling Eyes
it wasn't THAT rich, bit of smoke but not that much and not all the time either.

anyway, should be alright Smile
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hemi twofifteen turbo
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Location:
Melbourne
Registered:
October 2003
Re: What happens with no Oxy sensor Fri, 02 July 2004 16:50 Go to previous messageGo to next message
dam... if oxy sensors were so good as knowing a/f ratio's that the car wouldn't run w/o it then why bother with airflow sensors?!?

If it's a 3 or 4 wire type you can put it lower down, if it's a single wire type you need it as close to the engine as possible.

Why not put it on the extractors and not on your pipe?



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thechuckster
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Location:
Brisbane
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February 2003
 
Re: What happens with no Oxy sensor Sat, 03 July 2004 00:08 Go to previous messageGo to next message
hemi twofifteen turbo wrote on Sat, 03 July 2004 02:50

dam... if oxy sensors were so good as knowing a/f ratio's that the car wouldn't run w/o it then why bother with airflow sensors?!?


'cause (without a map sensor) there's no way the ECU will know what the engine is doing (apart from rpm from the dizzi and throttle position). Different air flows require differing ingition and injection timings.

tho... with ion sensing ignition (it checks result of each ignition/burn event via the spark plug) the ECU could do an even better job of tuning the fuel use and ignition timing during cruise.
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V8_MA61
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Brisbane
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June 2003
 
Re: What happens with no Oxy sensor Sat, 03 July 2004 07:46 Go to previous messageGo to next message
lol ask me about faulty o2 sensors! I have two of em Wink

Getting 400km highway driving / tank of fuel isnt very good for a 7mge!

I need to do a diagnosis on mine to make sure thats definetly the problem
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Norbie
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Brisbane
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May 2002
Re: What happens with no Oxy sensor Sat, 03 July 2004 13:20 Go to previous messageGo to next message
Narrow-band O2 sensors are only used under low-load, cruise conditions because (a) they're only good for keeping the mixtures at stoich (not what you want at WOT) and (b) they don't respond quickly enough to transient conditions.
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thechuckster
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Location:
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February 2003
 
Re: What happens with no Oxy sensor Sat, 03 July 2004 14:11 Go to previous messageGo to next message
V8_MA61 wrote on Sat, 03 July 2004 17:46

I need to do a diagnosis on mine to make sure thats definetly the problem

blake, to get codes from ECU:
-open <www.cygnusx1.net/supra/library/TSRM/fi/FI_001. html>
-click on "Diagnosis System"
-print pages Fi-23 to FI-29
-go out to car with pages and follow instructions

you car only has one O2 sensor? did you get a spare that was a dud? ;-(

how many wires on back ofth O2 sensor?
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SIMDOG
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Location:
Bayside Melbourne.
Registered:
May 2003
Re: What happens with no Oxy sensor Sat, 03 July 2004 16:52 Go to previous messageGo to next message
thechuckster wrote on Sun, 04 July 2004 00:11

V8_MA61 wrote on Sat, 03 July 2004 17:46

I need to do a diagnosis on mine to make sure thats definetly the problem

blake, to get codes from ECU:
-open <www.cygnusx1.net/supra/library/TSRM/fi/FI_001. html>
-click on "Diagnosis System"
-print pages Fi-23 to FI-29
-go out to car with pages and follow instructions

you car only has one O2 sensor? did you get a spare that was a dud? ;-(

how many wires on back ofth O2 sensor?


I replaced mine on my 7MGE and it was a dud. I then fitted an aftermarket one and adapted the plug to fit. There is only one wire on these O2 sensors.
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WiLo
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Location:
wollongong NSW
Registered:
August 2003
Re: What happens with no Oxy sensor Mon, 05 July 2004 10:57 Go to previous messageGo to next message
nothin bad just like everyone says just runs rich but i wouldnt suggest driving for long distances cos i was following a mate that just did a gze conversion that didnt have to O2 sensor in yet and the cat was glowing bright red
actually that was the time when it was running without the O2 and only on 2 cylinders because the coil had exploded or something
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Norbie
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Location:
Brisbane
Registered:
May 2002
Re: What happens with no Oxy sensor Mon, 05 July 2004 23:09 Go to previous messageGo to next message
Um, I think you'll find it was the running on 2 cylinders part that caused the glowing cat, not the missing O2 sensor. With no O2 sensor the ECU will just run in open-loop mode, which is what it does when you crack the throttle open anyway. In other words it will run richer but not stupidly rich.
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celicamad
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Location:
newcastle
Registered:
June 2002
Re: What happens with no Oxy sensor Tue, 06 July 2004 12:32 Go to previous messageGo to next message
Norbie is dead right in fact we have done a full a/f ratio test and comparison on two almost identical engine setups and the variation in the mixtures was almost undetectable .

Yes it ran SLIGHTLY richer with no o2 sensor but the differnce was so slight it was barley worth even getting the plate for the 02 sensor cut for my twin dumps.

i stll dont run one and fuel economy is about the same as 1js with 02 sensor

[Updated on: Tue, 06 July 2004 12:32]

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V8_MA61
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Location:
Brisbane
Registered:
June 2003
 
Re: What happens with no Oxy sensor Tue, 06 July 2004 12:46 Go to previous messageGo to next message
SIMDOG wrote on Sun, 04 July 2004 02:52

thechuckster wrote on Sun, 04 July 2004 00:11

V8_MA61 wrote on Sat, 03 July 2004 17:46

I need to do a diagnosis on mine to make sure thats definetly the problem

blake, to get codes from ECU:
-open <www.cygnusx1.net/supra/library/TSRM/fi/FI_001. html>
-click on "Diagnosis System"
-print pages Fi-23 to FI-29
-go out to car with pages and follow instructions

you car only has one O2 sensor? did you get a spare that was a dud? ;-(

how many wires on back ofth O2 sensor?


I replaced mine on my 7MGE and it was a dud. I then fitted an aftermarket one and adapted the plug to fit. There is only one wire on these O2 sensors.




How much did your afdtermarket o2 sensor cost?
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ZZT231
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I Supported Toymods

Location:
melbourne.vic.au
Registered:
May 2002
Re: What happens with no Oxy sensor Tue, 06 July 2004 13:05 Go to previous messageGo to next message
Drive a 5M-E. And watch fuel economy Sad
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thechuckster
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Location:
Brisbane
Registered:
February 2003
 
Re: What happens with no Oxy sensor Tue, 06 July 2004 13:11 Go to previous messageGo to next message
ZZT231 wrote on Tue, 06 July 2004 23:05

Drive a 5M-E. And watch fuel economy :

isn't that an oxymoron like "army inteligence" and "fresh frozen"?
Laughing Laughing Laughing
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ed_ma61
Forums Junkie


Location:
Lost in the K hole
Registered:
May 2002
Re: What happens with no Oxy sensor Tue, 06 July 2004 13:29 Go to previous message
Norbie wrote on Fri, 02 July 2004 14:05

I doubt it will run "rich as shit"


ask rob about the last time he drove behind me from a toymods meeting Rolling Eyes
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