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TPS & O2 Sensors 

 

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 Post subject: TPS & O2 Sensors
Posted: Mon Oct 10, 2005 11:20 am 
Tyre Shredder
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Just want to know what would be some of the signs of either of these sensors failing or starting to play up?

 

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Posted: Mon Oct 10, 2005 11:22 am 
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if you car has a decrease in k's per tank, loss of power or loss or acceleration. thats whats wrong with mine o2 sensor costs about $70 and TPS is about $90. i hope that helps

 

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Posted: Mon Oct 10, 2005 11:23 am 
Getting Side Ways
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TPS, someone just had this drama, do a search, should come up, O2 sensor, rough idle, excessive fuel consumption, do a diagnostic, will tell you, whether it running rich or lean, is a doco on here, about how to test your ECU, and read the codes.
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Posted: Mon Oct 10, 2005 11:24 am 
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what doco is that?

 

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 Post subject: Re: TPS & O2 Sensors
Posted: Mon Oct 10, 2005 11:29 am 
Getting Side Ways
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The_Jackal wrote:
Just want to know what would be some of the signs of either of these sensors failing or starting to play up?


TPS not necessarily easy to diagnose, particularly on a 5 speed. Mainly used for throttle enrichment, so spluttering or erratic acceleration (i.e. running too lean or too rich under steep throttle).

TPS signal wire should be about 0.98V with no throttle, about 5.0V will full throttle... and should be steady increase in voltage in between 0 and 100% throttle.

O2 sesnor, giveaway is poor fuel economy, might run like s**t at idle/cruising throttle... check error codes from ECU, "constant rich" or "constant lean" error.... O2 output should be switching between 0.1 and 0.9 volts when crusing under low/medium engine load...

 

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 Post subject: O2 Sensor
Posted: Mon Oct 10, 2005 12:10 pm 
Oompa Loompa
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Is it realistic to just change the O2 sensor? It has been on my mind to not bother about checking the codes etc. and just bunging a new one in. How long does it take for the computer to realise and readjust?
Does it make a noticeable difference to fuel economy? Just wondering.
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Posted: Mon Oct 10, 2005 12:11 pm 
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for $70 i would just change it and not worry bout it it does make a differance if thats the prob

 

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 Post subject: Re: O2 Sensor
Posted: Mon Oct 10, 2005 12:12 pm 
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onemilesniper wrote:
Is it realistic to just change the O2 sensor? It has been on my mind to not bother about checking the codes etc. and just bunging a new one in. How long does it take for the computer to realise and readjust?
Does it make a noticeable difference to fuel economy? Just wondering.


Yeah, i think you get them for about $80. Pull the old one out, stick the new one in.

Probably best to disconnect the battery for a while, as the ECU would have learnt some 'bad habits' as the o2 started to die.

I would make a big difference to fuel economy if the o2 was indeed stuffed. It's the main sensor for light throttle driving.

 

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 Post subject: O2 Sensor
Posted: Mon Oct 10, 2005 12:17 pm 
Oompa Loompa
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Is it realistic to just change the O2 sensor? It has been on my mind to not bother about checking the codes etc. and just bunging a new one in. How long does it take for the computer to realise and readjust?
Does it make a noticeable difference to fuel economy? Just wondering.
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 Post subject: O2 Sensor
Posted: Mon Oct 10, 2005 12:17 pm 
Oompa Loompa
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Age: 46

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Location: Perth
WA, Australia

Is it realistic to just change the O2 sensor? It has been on my mind to not bother about checking the codes etc. and just bunging a new one in. How long does it take for the computer to realise and readjust?
Does it make a noticeable difference to fuel economy? Just wondering.
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Posted: Mon Oct 10, 2005 4:00 pm 
Getting Side Ways
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do a search of the ecu forum as the auto needs to be taught when reseting the ecu.

 

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Posted: Mon Oct 10, 2005 4:23 pm 
Parts Gopher
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Can anybody tell me exactly where to find these 'Relearn Procedures'

Ive never had any luck finding them on here, and any other info i have found on the net has been absolutely useless... Things like shifting with the car on ACC between gears etc....

Same deal for the TPS....

As for resetting the ECU, numerous times i have disconnected the battery overnight and there has been NO change at all in the way the car drives, i also notice no change over time as in the car adapting to my friving style...
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Posted: Mon Oct 10, 2005 6:02 pm 
Tyre Shredder
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the reason i want to find out what does what is becuase when i accellerate it will hit about 2000rpm and between 2000 - 3500rpm it has a big flat spot then will go likea bat out of hell after that. it happened since i had the extractors and hi-flow cat fitted.

 

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Posted: Mon Oct 10, 2005 6:07 pm 
Getting Side Ways
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i would replace the O2 sensor you never know what they could have done to it while taking it of or putting it on. and it just so happens to be just as you get extractors and exhaust

 

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 Post subject: Re: TPS & O2 Sensors
Posted: Mon Oct 10, 2005 8:58 pm 
Getting Side Ways
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4.9 EF Futura wrote:
The_Jackal wrote:
Just want to know what would be some of the signs of either of these sensors failing or starting to play up?


TPS not necessarily easy to diagnose, particularly on a 5 speed. Mainly used for throttle enrichment, so spluttering or erratic acceleration (i.e. running too lean or too rich under steep throttle).

TPS signal wire should be about 0.98V with no throttle, about 5.0V will full throttle... and should be steady increase in voltage in between 0 and 100% throttle.

O2 sesnor, giveaway is poor fuel economy, might run like s**t at idle/cruising throttle... check error codes from ECU, "constant rich" or "constant lean" error.... O2 output should be switching between 0.1 and 0.9 volts when crusing under low/medium engine load...



mines being showing those signs, erratic acceleration, and spluttering, i beilive it has to be the TPS, im going to try fixing it ASAP

 

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