What is your Air Fuel Ratio? Scan-Guage II

[SnowLizard]

I think I'm running rich... imo avg a/f is 10...

if I'm light on pedal I'm ......11
coasting............................12
morning .............................7


I think I'm rich... what is everyone else's A/F?

 

[19963.4lsr5]

I didn't even know you could see the AF as the default OBD2 on a ScanGauge. I had to program it into Xgauge to see it on my Saturn. And my one scanner doesn't show AF in live data.

Are you running in closed loop?


Sent from my iPhone using Tapatalk

 

[nc-grayson]

yeah.....A/F? Maybe I'm blitzed but is that a default code? or an xgauge?

 

[JayRolla]

Does the 99 have a wbo2 stock? Those numbers are crazy rich for open loop warm up and idle.

 

[frodiesel]

Yeah, scan gauge doesnt change your sensors into a wideband.

Its likely calculating it from the 0-5v the stock o2 sensors produce. Is there a chance its realtime a/f....unlikely.

Sent from my SM-G900P using Tapatalk

 

[JayRolla]

Yeah, scan gauge doesnt change your sensors into a wideband.

Its likely calculating it from the 0-5v the stock o2 sensors produce. Is there a chance its realtime a/f....unlikely.

Sent from my SM-G900P using Tapatalk

Narrowband does 0.5v to 1.0v. If it did up too 5v it would be a wide band.

 

[19963.4lsr5]

May be he can post a picture of the readout. And year or rig.


Sent from my iPhone using Tapatalk

 

[SnowLizard]

Yes I have a 99 4runner, it does have 2 cats, so it's cali emissions.

For the picture, what would you like to see on the Guage screen, I can fit 4

A/F
Clsd loop
Water temp?
Tps?

Just let me know, thx guys

 

[phattyduck]

Sounds like the math you are using is wrong... What codes are you using in the Scangauge?

Should be 14.7 +/- a few tenths for normal driving. Full lean when coasting (not sure what the ECU would report) and probably in the 10:1 to 12:1 range when full throttle. Readings when cold aren't really valid (the sensor has to warm up).

-Charlie

 

[SnowLizard]

Sounds like the math you are using is wrong... What codes are you using in the Scangauge?

Should be 14.7 +/- a few tenths for normal driving. Full lean when coasting (not sure what the ECU would report) and probably in the 10:1 to 12:1 range when full throttle. Readings when cold aren't really valid (the sensor has to warm up).

-Charlie

I agree, I want 14.7 +/-

what 'temp' is correct for engine, would be safe to say once water temp is 190*, the O2 is at temp?

 

[phattyduck]

I agree, I want 14.7 +/-

what 'temp' is correct for engine, would be safe to say once water temp is 190*, the O2 is at temp?

The sensor shouldn't take more than a minute to get up to operating temp, but the engine will go closed loop sometime after then engine temp is in (or above) the 140*-160*F range. Before that time, it will run a rich map during warm up.

I couldn't get the A/F to work on my '99 CA spec truck. Trans temp does work though...

-Charlie

 

[quicksilvr]

I think I'm running rich... imo avg a/f is 10...

if I'm light on pedal I'm ......11
coasting............................12
morning .............................7


I think I'm rich... what is everyone else's A/F?

If your rig is running normal, and seems fine, but you're seeing those numbers on the ScanGauge II, then you didn't get the ScanGauge code programmed right.

My truck runs at 14.6 most of the time, cruising. Get into the go-pedal a little, and it drops to 13. Get into the go-pedal a lot, and it drops to 11.7.

Right after I lift and it starts to coast, it'll sometimes go as lean as 17. But it's right back to 14.6 pretty quick.

 

[SnowLizard]

If your rig is running normal, and seems fine, but you're seeing those numbers on the ScanGauge II, then you didn't get the ScanGauge code programmed right.

My truck runs at 14.6 most of the time, cruising. Get into the go-pedal a little, and it drops to 13. Get into the go-pedal a lot, and it drops to 11.7.

Right after I lift and it starts to coast, it'll sometimes go as lean as 17. But it's right back to 14.6 pretty quick.

VERY possible, so here is my programming...
Name.... A/F
TXD.... 686AF101B4
RXF.... 044145B40000
RXD.... 2808
MTH.... 05BE00800000

I do have a cali emissions dual cat setup, with an o2 plug and wide band and a sticker say'n it's emission-ed for California.

I took pictures on the way home today from work. I set the guage up as follows...

A/F.............*fWT
TPS............LP
in picture I can also make out the rpm speed and odometer...


I do have to apologize, I think I exaggerated my 1st post... it's probably should have read the following... :brick:

I think I'm running rich... imo avg a/f is 12.5ish..

if I'm light on pedal I'm ......12.2
coasting............................12.5
morning .............................8

I think I'm rich... what is everyone else's A/F?

I could make a table to post up online for everyone I took a bunch of pictures.... from OD 607 to 613... my commute home from work.
here's the start...

[/url]

the start (above pic) is
1350rpm 0MPH 175607od 8.15A/F 121fWT 9TPS CLSD LP
the end is sitting on the driveway
0900rpm 0mph 175613od 12.4A/F 193fWT 9TPS CLSD LP

it never saw an open LP

 

[19963.4lsr5]

What is the AF while driving?


Sent from my iPhone using Tapatalk

 

[SnowLizard]

rpm mph od af wt tps lp
1350 00 607 8.15 121 09 clsd
1300 00 607 8.26 136 09 clsd
1000 00 607 9.07 154 09 clsd
1650 50 608 9.18 181 14 clsd
1650 50 608 9.18 182 15 clsd
1450 44 608 9.41 188 09 clsd
1600 49 608 9.99 190 13 clsd
1600 48 609 9.87 190 15 clsd
1550 46 609 10.1 190 12 clsd
1500 46 610 10.1 190 12 clsd
1500 46 610 10.1 190 12 clsd
1800 46 610 10.7 188 15 clsd
1750 46 610 10.7 188 16 clsd
4400 57 611 10.9 190 68 open
1600 46 611 10.5 191 09 clsd
1500 43 611 10.6 191 09 clsd
0700 00 611 11.0 190 09 clsd
0700 00 611 11.0 191 09 clsd
1750 40 611 11.4 190 17 clsd
1750 41 611 11.4 190 17 clsd
2500 45 611 11.5 190 34 clsd
1600 48 611 11.5 190 09 clsd
2600 47 612 11.7 190 14 clsd
2700 51 612 11.7 190 51 clsd
2000 45 612 11.8 190 25 clsd
1650 45 612 11.8 191 13 clsd
1750 45 612 11.8 191 15 clsd
1750 45 612 11.8 191 14 clsd
1750 46 612 11.9 191 14 clsd
1400 44 612 11.9 190 09 clsd
1700 45 613 12.4 191 14 clsd
1900 43 613 12.4 191 09 clsd
1600 30 613 12.4 191 15 clsd
1600 31 613 12.4 191 14 clsd
1400 32 613 12.4 191 12 clsd
1450 32 613 12.4 191 12 clsd
1350 36 613 12.4 191 29 clsd
1300 35 613 12.5 191 09 clsd
1250 34 613 12.5 191 09 clsd
1200 32 613 12.5 191 09 clsd
1600 30 613 12.5 193 15 clsd
1500 31 613 12.5 193 14 clsd
0900 00 613 12.4 193 09 clsd



this is 'spirited driving'... and coasting... and with traffic.. open was WOT...

 

[19963.4lsr5]

Quicksilver needs to compare his Xgauge to yours.


Sent from my iPhone using Tapatalk

 

[SnowLizard]

ok, so after 2x 30 miles trips I got some more data with 3 hrs between drives

2350 69 618 10.2 190 22 clsd - 1 mile on freeway
2200 67 630 12.1 193 14 2.49gph - switched to gph
2200 68 639 11.7 191 16 2.85gph - on the way home
2100 64 644 12.4 193 31 4.82gph
2200 67 647 12.7 193 15 2.47 - going down hill
2150 66 647 12.7 193 27 4.80 - going up the hill
2200 66 647 12.7 193 33 5.03
2200 66 648 12.7 193 37 5.16
...................................
0600 00 658 14.3 193 09 0.30 stopped on driveway


so good news... I can reach 14 a/f
bad news... it takes 60 miles.

so guess this thread has turned into...

How long does it take your truck to reach 14:1 A/F ? mine is 60 miles... with a 3hr rest in the middle...

even then, it didn't reach 13a/f till I was off the freeway... and it 'barely' reached 14 in the neighborhood.


Question, could an 'exhaust' leak cause a 'rich' symptom? maybe if there was a leak before or after the sensor but before the 2nd sensor? idk, just not sure where to go on this one.

 

[JoeT4R]

Here's what my 2001 runs at.

 

[SnowLizard]

Here's what my 2001 runs at.

How long did it take to get to 14.5a/f?

Without the stop, mine took almost 1hr of driving

 

[19963.4lsr5]

There is a thing in the exhaust called reversion. That will cause a leak to pull air inside. If you have leaks fix them.

Every 4Runner I've had both O2 sensor mounts looked nasty and one of them had 90% of both mounting nuts rusted to little round nubs.

I gained 3mpg in my little S Series Saturn fixing leaks.




Sent from my iPhone using Tapatalk