New owner; O2 sensor problem?
Pole Position
Joined: Dec 2009
Posts: 3,135
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From: CA - San Diego
Thread Starter
Pit Crew
Joined: Dec 2016
Posts: 123
Likes: 37
From: Lourinhã
Happy I can put it to good use for this project.
Edit: I can't really get the table to format nicely. So first number is at 800 rpm and the second number or range is at 2500 rpm separated by forward and backward slashes
Short FT 1: 19,5 /\ 0 - 6 (fluctuates zero to six)
Long FT 1: 28,8 /\ 28,7
Short FT 2: 19,5 /\ -5 - 3 (fluctuates minus five to plus three)
Long FT 2: 26,6 /\ 25,9
O2 FT B1 S1: 19,49 /\ +/-3 (fluctuates minus three to plus three)
O2 FT B1 S2: 99,15 /\ 99,15
O2 FT B2 S1: 19,49 /\ +/-3 (fluctuates minus three to plus three)
O2 FT B2 S2: 99,15 /\ 99,15
O2 S B1 S1: 0V /\ 0,8
O2 S B1 S2: 0V /\ 0,74
O2 B2 S1: 0V /\ 0,8
O2 B2 S2: 0V /\ 0,74
Airflow gm/s: 3,5 /\ 13
Surprisingly my vacuumhoses look ok.
I do now suspect I have an exhaust leak though, so I'll have to investigate and fix that first.
Cheers and thanks again for all the input and help
Johan
Last edited by JohanH; Feb 25, 2018 at 06:54 AM. Reason: Table fixed
Racer
Joined: Oct 2015
Posts: 1,810
Likes: 170
From: Colorado
Well you have a vacuum leak. I don't think that's the only issue though by those numbers, because of the lack of change in long term percentages. A quick question how long was those readings taken after you raised the rpm's? Was it almost immediately, or did you give fifteen seconds or so to adjust? If you didn't give time for long ter trim to settle. Then you probably only have a vacuum leak. If you did give it sufficient time. Then I suspect you might have an additional issue. Either way you need to fix the vacuum leak first.
About exhaust leak. You would have to have a leak on both banks before the first cat to make those numbers bilaterally.
About exhaust leak. You would have to have a leak on both banks before the first cat to make those numbers bilaterally.
Last edited by Coleroad; Feb 25, 2018 at 09:30 AM.
Pole Position
Joined: Dec 2009
Posts: 3,135
Likes: 276
From: CA - San Diego
Depends. It depends on a couple of factors.
- Threaded or grommet base PCV - original motors had a push in PCV. Later models were threaded in.
- if grommet based has the grommet deteriorated broken
- foam covering is loosely fit anyway.
Last edited by VVTiBob; Feb 25, 2018 at 12:36 PM.
Thread Starter
Pit Crew
Joined: Dec 2016
Posts: 123
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From: Lourinhã
Yes, it is grommet based, and it is the insert that I can move fairly freely for a couple of mm.
I wil try an check if I can see if the grommet is broken.
If it is push in fit, can I pull it out without breaking it?
Thanks,
Johan
I wil try an check if I can see if the grommet is broken.
If it is push in fit, can I pull it out without breaking it?
Thanks,
Johan
Lexus Test Driver
Joined: Dec 2014
Posts: 8,213
Likes: 949
From: Fl
The vacuum hoses may look good but looks can be deceiving. There may be a crack on the opposite side.
Plenty of us have found bad hoses on SC430s the same age as yours. Mine is a 2002 and had 70k miles when I found several bad hoses.
good luck!
Plenty of us have found bad hoses on SC430s the same age as yours. Mine is a 2002 and had 70k miles when I found several bad hoses.
good luck!
Thread Starter
Pit Crew
Joined: Dec 2016
Posts: 123
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From: Lourinhã
Again, thanks all.
I'll first fix the exhaust leak that I know I have (can definitely hear it).
If I spray with soapy water, don't I risk the engine sucking in the solution as it is running lean?
And is the oil dipstick supposed to have rubber grommets?
Cheers,
Johan
I'll first fix the exhaust leak that I know I have (can definitely hear it).
If I spray with soapy water, don't I risk the engine sucking in the solution as it is running lean?
And is the oil dipstick supposed to have rubber grommets?
Cheers,
Johan
Thread Starter
Pit Crew
Joined: Dec 2016
Posts: 123
Likes: 37
From: Lourinhã
I am still struggling with this issue.
Replaced one hose that looked bad and replaced some hose clamps.
Rest of the hoses that I can see look ok.
PCV valve and hose are ok; once I remove and re-inserted the valve it feels more tight.
Checked the EVAP VSV valve and it works ok.
Removed and checked the breather box between airfilter and throttle body; all seems fine.
Sprayed starter fluid on several places but no change that I can detect.
Funny thing is that when I spray starter fluid in the air-intake only SFT2 goes down; SFT1 remains unchanged (at idle)
Any ideas?
Thanks in advance,
Cheers,
Johan
Replaced one hose that looked bad and replaced some hose clamps.
Rest of the hoses that I can see look ok.
PCV valve and hose are ok; once I remove and re-inserted the valve it feels more tight.
Checked the EVAP VSV valve and it works ok.
Removed and checked the breather box between airfilter and throttle body; all seems fine.
Sprayed starter fluid on several places but no change that I can detect.
Funny thing is that when I spray starter fluid in the air-intake only SFT2 goes down; SFT1 remains unchanged (at idle)
Any ideas?
Thanks in advance,
Cheers,
Johan
Sorry, I’m baffled on this one.