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Author Topic: If I wanted to replace O2 sensors, what's the best way?  (Read 4019 times)

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Webby the Bear

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Re: If I wanted to replace O2 sensors, what's the best way?
« Reply #15 on: 16 February 2013, 00:21:52 »
Quote from: chrisgixer on 16 February 2013, 00:20:27
Have you got another known god maf to try?

i have two. the one on the car that was in when i had it techII'd and the spare onefrom my old breaker. there was no known probs with the breaker MAF. I dont have another one though  :)
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feeutfo

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Re: If I wanted to replace O2 sensors, what's the best way?
« Reply #16 on: 16 February 2013, 00:23:02 »
And did he check multi rams (I'm sure he would have done) ? and what are the economy figures, out of interest? :)
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Webby the Bear

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Re: If I wanted to replace O2 sensors, what's the best way?
« Reply #17 on: 16 February 2013, 00:25:42 »
Quote from: chrisgixer on 16 February 2013, 00:23:02
And did he check multi rams (I'm sure he would have done) ? and what are the economy figures, out of interest? :)

got to be honest mate i dont know  :-[ is this the thing to be checked for vac leaks?

well got 19mpg around town. then used it to travel further everyday to school and it was 19.5mpg  :-[
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Webby the Bear

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Re: If I wanted to replace O2 sensors, what's the best way?
« Reply #18 on: 16 February 2013, 00:35:33 »
oh and also checked and absolutely no resistance when pushed in neutral to rule out stuck caliper  :y
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feeutfo

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Re: If I wanted to replace O2 sensors, what's the best way?
« Reply #19 on: 16 February 2013, 00:44:31 »
Quote from: Webby the Bear on 16 February 2013, 00:25:42
Quote from: chrisgixer on 16 February 2013, 00:23:02
And did he check multi rams (I'm sure he would have done) ? and what are the economy figures, out of interest? :)

got to be honest mate i dont know  :-[ is this the thing to be checked for vac leaks?

well got 19mpg around town. then used it to travel further everyday to school and it was 19.5mpg  :-[
Yes, tech 2 can check they are working, it has a remote operation mode.

19mpg round town doesn't sound too bad, I struggled to get more than 18 out of my old 2.5 cdx. :-\
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feeutfo

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Re: If I wanted to replace O2 sensors, what's the best way?
« Reply #20 on: 16 February 2013, 00:45:37 »
Any flat spots while driving? Does it take off at 4k?
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Webby the Bear

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Re: If I wanted to replace O2 sensors, what's the best way?
« Reply #21 on: 16 February 2013, 00:55:31 »
flat spots as in power?

its seemed very sluggish in the cold. in fact sluggish when warm, just less so.

as said since i swapped the maf it seems to want to move again so wonder if its cured the problem  and that was it.

ill still going to swap out the diss this weekend tho  :y
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feeutfo

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Re: If I wanted to replace O2 sensors, what's the best way?
« Reply #22 on: 16 February 2013, 00:59:27 »
Dis swap out is an exceptionally fiddly job at the best of times. I removed plenum and scuttle for access last time iirc.
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Webby the Bear

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Re: If I wanted to replace O2 sensors, what's the best way?
« Reply #23 on: 16 February 2013, 01:05:17 »
Quote from: chrisgixer on 16 February 2013, 00:59:27
Dis swap out is an exceptionally fiddly job at the best of times. I removed plenum and scuttle for access last time iirc.

it is mate and i did exactly the same.  :y

can you think of anything else in addition to what i've done and what i'm going to do to check? just really trying to get it in my head a list of culprits, target the things i can do for free (from my mini parts dept. in the garage  ::)) moving up the parts in price order if still not resolved :y
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feeutfo

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Re: If I wanted to replace O2 sensors, what's the best way?
« Reply #24 on: 16 February 2013, 01:12:29 »
Quote from: Webby the Bear on 16 February 2013, 01:05:17
Quote from: chrisgixer on 16 February 2013, 00:59:27
Dis swap out is an exceptionally fiddly job at the best of times. I removed plenum and scuttle for access last time iirc.

it is mate and i did exactly the same.  :y

can you think of anything else in addition to what i've done and what i'm going to do to check? just really trying to get it in my head a list of culprits, target the things i can do for free (from my mini parts dept. in the garage  ::)) moving up the parts in price order if still not resolved :y
Well, if the ignition system is week the pre face lift can't raise a code for a miss fire. Loose plugs, oil in plug wells, buggered leads, and dis could all contribute, but you'd know as the engine will be flat and or suffer vibration.

Suspect maf me self.

See what others say though. :y
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feeutfo

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Re: If I wanted to replace O2 sensors, what's the best way?
« Reply #25 on: 16 February 2013, 01:14:33 »
Also, give the throttle a good blip from the engine bay first. See if the multi rams work.

You need to be fairly violent with the engine revving though.
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Webby the Bear

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Re: If I wanted to replace O2 sensors, what's the best way?
« Reply #26 on: 16 February 2013, 01:15:25 »
Quote from: chrisgixer on 16 February 2013, 01:12:29
Quote from: Webby the Bear on 16 February 2013, 01:05:17
Quote from: chrisgixer on 16 February 2013, 00:59:27
Dis swap out is an exceptionally fiddly job at the best of times. I removed plenum and scuttle for access last time iirc.

it is mate and i did exactly the same.  :y

can you think of anything else in addition to what i've done and what i'm going to do to check? just really trying to get it in my head a list of culprits, target the things i can do for free (from my mini parts dept. in the garage  ::)) moving up the parts in price order if still not resolved :y
Well, if the ignition system is week the pre face lift can't raise a code for a miss fire. Loose plugs, oil in plug wells, buggered leads, and dis could all contribute, but you'd know as the engine will be flat and or suffer vibration.

Suspect maf me self.

See what others say though. :y

....especially with the initial low (9) reading and then the apparent improvements  :y

ive got a set of leads too that ive tested and are good.... may just swap them out for the shits and giggles  :y

thanks for your info chris, much appreciated  :y :y :y and to everyone whos contributed  :y :y :y
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Webby the Bear

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Re: If I wanted to replace O2 sensors, what's the best way?
« Reply #27 on: 16 February 2013, 01:16:01 »
Quote from: chrisgixer on 16 February 2013, 01:14:33
Also, give the throttle a good blip from the engine bay first. See if the multi rams work.

You need to be fairly violent with the engine revving though.

what am i looking fo, chris? sorry i dnt really know what they are
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feeutfo

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Re: If I wanted to replace O2 sensors, what's the best way?
« Reply #28 on: 16 February 2013, 01:34:35 »
Quote from: Webby the Bear on 16 February 2013, 01:16:01
Quote from: chrisgixer on 16 February 2013, 01:14:33
Also, give the throttle a good blip from the engine bay first. See if the multi rams work.

You need to be fairly violent with the engine revving though.

what am i looking fo, chris? sorry i dnt really know what they are
There's two, one centre/middle of the bag pipes/inlet between water pump pulley and radiator, and another at the back of the plenum pas side.
Find the front one on the inlet first perhaps, and blip the lever on the throttle body to make the engine rev and make the mram move, then you'll know what to look for on the rear one back of plenum.

When revving the front one moves relatively easily at about 4k but you need to give it plenty of beans. The rear one takes even more revs to move it.

Get the engine up to temp before revving the knackers off to though. :y


If the either of the multi rams fail to move, fix that before doing anything else. IMO. :y
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feeutfo

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Re: If I wanted to replace O2 sensors, what's the best way?
« Reply #29 on: 16 February 2013, 01:37:25 »
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