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The op comes back with the fuel trim percentages at the higher rpm. we'll know for sure just from that. It's awesome the op came with all the information he did. It makes it really easy to narrow the problem down.
Below are todays measurements. Funny thing is I almost regretted buying the scanner; bought it to use with my GS300 that I bought a year ago, but that has been troublefree.
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; 02-25-18 at 06:54 AM.
Reason: Table fixed
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.
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?
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?
Exhaust leak has been fixed, but the P0171 and P174 have returned.
As I don't really see broken or cracked hoses I'm considering building a smoke tester and doing a smoke test.
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)
02-25-18, 06:43 AM
Sorry, I’m baffled on this one.