97 Camry 2.2L Running Rich??? - Toyota Nation Forum : Toyota Car and Truck Forums
Camry 3rd & 4th Gen (1992-1996 & 1997-2001)/1st Gen Solara (1999-2003) Toyota Camry Discussion for years 1992-1996 & 1997-2001, as well as Solara discussion for years 1999-2003. Topics of discussion range from fuel economy, safety, modifications, performance all involving America's favorite family car, the Toyota Camry.

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post #1 of 11 Old 06-14-2019, 10:51 AM Thread Starter
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97 Camry 2.2L Running Rich???

Hey guys...

I am completely turned around and lost right now.
I have a 1997 Toyota Camry with the 4cyl 2.2L automatic transmission.
I went to go get it smogged and it passed all but the emission from the tailpipe. My CO was sky high and HC was a little high. Mechanic said it was because car is running rich for some reason.
I have been running through all the issues and sensor and can not seem to locate the issue.
Here are my fuel trims at idle:
-5.5% Short Term
13.3% Long Term

and whats weird is the short moves around a little form 0% to -5.5% however the long term seems to be locked at 13.3%
Also, when applying around 1500RPM the long term actually gets worse and goes up to 15.3% (therefore not a vacuum leak)

Here is the part I'm completely lost about...
My upstream O2 sensor is pretty much flat reading 0.65v all the time... It doesn't oscillate rich-lean-rich-lean at all..
So I just assumed my O2 must be bad/lazy. I swapped with a known good O2 and it still is completely the same... reading 0.65v constantly pretty much.
My downstream is readding a pretty consistent 0.56v

The wiring to the o2 looks great. It's a known-good sensor. Just not sure what the hell is going on....



Things I've done:
Tested & Confirmed: MAP
Tested & Confirmed: No Vacuum Leaks
Tested & Confirmed: EVAP Purge Valve
Tested & Confirmed: Fuel Pressure
Tested & Confirmed: Air Filter
Tested & Confirmed: Spark Plugs
Cleaned: Throttle Body
Cleaned: Idle Air Control Valve
Replaced: PCV Valve
Replaced: PCV Hose

What am I missing? Care runs fine and seems normal. Just it's running rich I believe and therefore can't pass smog
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post #2 of 11 Old 06-14-2019, 01:12 PM
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No error codes?
Verify o2 sensor heater and signal voltage at sensor itself.
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post #3 of 11 Old 06-14-2019, 01:34 PM Thread Starter
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Originally Posted by cj1 View Post
No error codes?
Verify o2 sensor heater and signal voltage at sensor itself.
No CEL and no codes.
Would you like me to actually take off the o2 sensor while car is running and then use a multimeter to check voltage? Is that what you're saying?
If voltage is reading wrong from OBD2 port, then the ECM must be at fault?
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post #4 of 11 Old 06-14-2019, 02:43 PM
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Back probe the O2 sensor while connected engine running should see the oscillating voltage(.2-.8v) above and below .45v. across signal wires.

If good then verify at ECM pins.



Heater voltage should be 12v across heater wires.


BBBind .com should have schematic of O2 sensor.
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post #5 of 11 Old 06-14-2019, 03:43 PM
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Quote:
Originally Posted by therehere3 View Post
Here are my fuel trims at idle:
-5.5% Short Term
13.3% Long Term
These figures show STFT is compensating for rich and LTFT is compensating for lean. But with no codes it means the FTs are in the range of fuel adjustment.

Quote:
Here is the part I'm completely lost about...
My upstream O2 sensor is pretty much flat reading 0.65v all the time... It doesn't oscillate rich-lean-rich-lean at all..
It is possibly an air/fuel ratio sensor, not an O2 sensor.
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1995 Camry Wagon LE. 2.2 5S-FE, Auto, 250K
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post #6 of 11 Old 06-14-2019, 04:28 PM
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Stillrunning as a point.
If you measure 3.3v on the signal wire indicates A/F sensor.
Is this a CARB compliant engine?
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post #7 of 11 Old 06-14-2019, 07:24 PM Thread Starter
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Quote:
Originally Posted by Stillrunning View Post
These figures show STFT is compensating for rich and LTFT is compensating for lean. But with no codes it means the FTs are in the range of fuel adjustment.



It is possibly an air/fuel ratio sensor, not an O2 sensor.
From my understanding those are both the same, just different names.
Nevertheless, whichever it is I swapped it with a known good one (from my dad's 97 camry same engine and everything)

Also, this engine does not have a carburetor, it is fuel injected.
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post #8 of 11 Old 06-14-2019, 08:23 PM
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Quote:
Originally Posted by therehere3 View Post
From my understanding those are both the same, just different names.


Quote:
Also, this engine does not have a carburetor, it is fuel injected.
C.A.R.B - California Air Resource Board. Not carburetor.

1995 Camry Wagon LE. 2.2 5S-FE, Auto, 250K
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post #9 of 11 Old 06-14-2019, 10:30 PM
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Disconnect down stream O2S and see what upstream does.
Is not uncommon for a bad sensor to lie to pcm and not set a code

Propane test works great to determine If 02S and A/F are actually good .

Also clear all PCM memories if a component was changed.
This allow factory Fuel data to be used first then adjust if needed AKA fuel trims
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post #10 of 11 Old 06-15-2019, 05:28 PM
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ur trims are fine and 3.3 or .66 is fine for an a/f sensor, which is not the same as an o2 sensor btw.
something else is going on. are all 6 monitors 'ready' including the catalytic monitor? if not, then you won't get codes set until they are. if the cat monitor won't go ready despite running through the toyota recommended drive cycles to force it ready, then you have a marginal/bad cat.
***note, if you reset the ecm memory, you'll need to drive it alot to get the monitors to go ready. i don't recommend doing this except in rare cases where you know you've fixed the problem and just don't want to wait for the CEL to clear itself after a set amount of successful drive cycles because you lose valuable data like freeze frame data and the states of the monitors.
tony

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2006 Camry, 2AZ-FE, U250E

Last edited by mcgowaw; 06-15-2019 at 05:31 PM.
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post #11 of 11 Old 06-16-2019, 07:03 AM
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Quote:
Originally Posted by therehere3 View Post
Here are my fuel trims at idle:13.3% Long TermJust it's running rich I believe and therefore can't pass smog
It's hard to diagnose FTs with only one captured value. Best to see values with graphing software - especially STFTs.

That 13.3% LT does not show rich - it shows compensation for lean, but at 13.3% the air/fuel ratio should still be stoichiometric - that's why the computer adjusts Fts, to keep proper A/F ratio. No code means adjustment is still within range. 25% would trip a code.

If there are no misfires then high CO at tailpipe may be due to raw fuel from somewhere else.

It's possible an injector(or 2) may be leaking? Try running a couple cans of injector cleaner through fuel tank. Maybe leaking fuel pressure regulator?

1995 Camry Wagon LE. 2.2 5S-FE, Auto, 250K
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