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#1 | ||
Regular Member
Join Date: Oct 2011
Location: Mildura
Posts: 355
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I'm chasing down the cause of a surging idle problem and still need to check for vacuum leaks and MAF issues, which from searching the forums seems to be a common cause.
However, I was talking to a mate about it and he reckons it's more than likely the o2 sensors on my headers, as they only have a 100k lifespan. Is this right, the 100k lifespan? My car's done close to 130k atm. The problem started after recently having to raise the motor to replace engine mounts. Ever since it's had this surging idle. not sure if I've bumped the o2Sensors while buggering around down there, or if one of the vacuum hoses at the top end has stretched too far when the motor was being lifted. It doesn't happen when the motor is stone cold, or when its at operating temp, only seems happen in that mid-temp range. However the motor just doesn't feel as sweet as is normally does throughout the rev/temp range, so something is definitely wrong.
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Current: 2000 AUII XR8 manual ute. 1966 XP Pursuit ute. 2012 Honda Euro manual (daily drive) Past: 1984 XE Falcon sedan 4.1L. |
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#2 | ||
Falcon Unbelievable!
Join Date: Jul 2005
Location: Uncle Henry's Garage
Posts: 382
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I've my AU S1 since 70k its now got 260k and 8 years later and I have never replaced my O2 sensor.
I know I lot of people swear by it, just depends on the car I think they all seem to have their things mine hates unleaded fuel. |
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#3 | ||
Cat be Still !!!
Join Date: Oct 2007
Location: Perth. WA
Posts: 1,672
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Mine were becoming lazy (hunting idle) from time to time at 50k!
Replaced and all is good.
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2002 AUIII XR8 n/a: 13.65@101.8mph. With Raptor Assist:..12.73@111.5mph. With ET Streets:......12.44@110.7mph, a one time fluke.........12.54@110mph back to back. With 3.9 Gears:.......12.40@112.5mph, still trying! Tune by XFT |
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#4 | ||
not here much anymore
Join Date: Dec 2004
Location: Sthn NSW
Posts: 22,918
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100,000kms max.
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2024 F150 XLT
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#5 | ||
Big Member
![]() Join Date: Dec 2009
Location: SE Qld
Posts: 5,873
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Man, mine are at least 150k. Possibly the full 428,000
Don't seem to have an issue with mine? Other than chewing through LPG like no mans business. Petrol mileage is pretty good though.
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The Scarlet Fairlane: 94 5.Slow Litre NC II Fairlane 488800kms & Climbing Rollin' on genuine ELGT wheels. K&N Filter /////Alpine Sound. EBGT Momo Woodgrain Steering Wheel The Scarlet Fairlane Build Thread Project "White Knight" 93 ED XR6 ROH Alloys Momo wheel Cruise Sunroof Premo Sound Manual HO Goodies PWK Build Thread 1990 Yamaha FZR 250: 59000ks & climbing. New fairing, old tank, my angry mosquito in a coffee tin! 14.977 1/4mile. ![]() |
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#6 | ||
FF.Com.Au Hardcore
Join Date: Jun 2005
Posts: 588
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I changed mine around 180,000km when trying to figure out high consumption. Didn't make one bit of difference, so the old one was probably just fine.
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#7 | ||
Regular Member
Join Date: Oct 2011
Location: Mildura
Posts: 355
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Thanks for the replies fellas.
__________________
Current: 2000 AUII XR8 manual ute. 1966 XP Pursuit ute. 2012 Honda Euro manual (daily drive) Past: 1984 XE Falcon sedan 4.1L. |
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#8 | ||
Regular Member
Join Date: Apr 2006
Posts: 45
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My AU111 has done 175,000klms and still on the original O2 sensor and car is running fine.
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#9 | |||
Back to Le Frenchy
Join Date: Feb 2005
Location: Back home.....
Posts: 13,346
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They're a consumable and are only rated to 100k, the same as many other parts.
Just because you haven't replaced them and the car is still running doesn't mean that they're fine. My bet is if you replace them you'll notice an improvement in at least fuel economy and if they're bad idle too.
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Quote:
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#10 | ||
FF.Com.Au Hardcore
Join Date: Nov 2006
Location: Sydney
Posts: 1,334
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The Bosch catalogue (linked below) suggests a replacement interval of 250,000km for the AU V8 Falcons in the catalogue next to the part number. This contrasts with a suggested replacement interval of 160,000km for the type of sensor used (4 wire planar), which is listed in the introduction/explanation of sensor types.
http://www.bosch.com.au/car_parts/en...r__Cat_WEB.pdf I've got 130,000km on my XR8 at the moment and the fuel consumption has skyrocketed- struggling to get more than 360km from a tank and I used to easily get 450km so this is something I'll be checking. |
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#11 | ||
Regular Member
Join Date: Oct 2011
Location: Mildura
Posts: 355
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Since my first post I've checked for vacuum leaks, and as far as I can tell haven't got any.
Also plugged a scanner into to see if any errors popped up, and nothing's ringing any alarm bells, so the 02 sensors are my next port of call. Are there any tricks/pitfalls to fitting them? Is it as simple as disconnecting and unscrewing the old ones and screwing in and connecting the new ones? Do I need to use any type of sealant?
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Current: 2000 AUII XR8 manual ute. 1966 XP Pursuit ute. 2012 Honda Euro manual (daily drive) Past: 1984 XE Falcon sedan 4.1L. |
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#12 | ||
not here much anymore
Join Date: Dec 2004
Location: Sthn NSW
Posts: 22,918
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No. Undo old ones, unplug and fit new ones. No sealant required.
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2024 F150 XLT
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#13 | ||
FF.Com.Au Hardcore
Join Date: Jun 2005
Posts: 588
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They can be a bit fiddly to remove if you don't have an offset spanner. I think the size was 22 or 23mm. I didn't have one, couldn't get an adjustable wrench in there, so I ended up removing the exhaust manifold to remove it. You can use your new O2 sensor to determine the correct spanner size.
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#15 | ||
FF.Com.Au Hardcore
Join Date: Feb 2005
Location: Melb north
Posts: 12,025
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I'm on my second o2 sensor, put in the newy at approximately 150000, i suspect their service life is dependant on the rate at which they become grotyed up, ie a highway car it lasts a long time , a city car lots of stop starts = shorter service life, also as the engine becomes a bit tired with a lot of miles, i'm guessing oil contamination from oily exhaust fumes would shorten the service life also.
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#16 | ||
Sly like a G6
Join Date: Jun 2006
Location: Hunter Valley Whine Country
Posts: 1,808
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One simple way to check if the O2 sensor is working is to just fill your tank to the brim. This will fill up the fume canister which will purge like buggery into the intake. If the car runs like a hairy goat for 15km or so afterwards, the O2 sensor isn't able to respond to the suddenly richer mixture.
This works for wagons at any rate, dunno about sedans or utes. It takes about 10 minutes to brim fill a wagon, it takes an extra 15 litres or so after the nozzle clicks off.
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The Frankenfalcon... AU1.5 Wagon, BA brakes, AU2 booster, BA2 XR6T engine, stock from airbox to turbo, 8psi/98 octane tune 240RWKW, BF XR6T cat, quiet 3" zorst, Pex BSO660 & BSO439 mufflers, 84 db, built BTR box, 3.08 LSD, Emer SVI LPG, AU1 XR8 alloys, Momo wheel, JVC KDR746BT head unit, Aerpro steering wheel control wiring. Sleeper, anyone? |
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