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Discussion Starter #1 (Edited)
Hello everyone

1997 Camry 2.2 liter 5fse automatic. It runs smoothly, power is good, never stalls or sputters.
I don't know this engine, only had it for a year, and only ever changed oil on this one.

Had a test last week and it did not pass. The mechanic told me to change lambda sensor and clean or change plugs.

Then I have been reading here on the forum what to check, clean or change:
* EGR valve
* Battery clamps
* Run through a tank with Seafoam added (are there other brands in case I can't find seafoam?)
* Plugs (how do I know if they're bad? Should I hold it against the engineblock and watch for regular sparks?)
* Check air filter (I did, it's clean)

I don't have the testpaper here to see which value was off and by how much, I'll add that later.

Is the lambda sensor needed? If so, which brand?

All help and input is appreciated.
 

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Sort of shooting in the dark here with so little info. Does your car display a Check Engine Light? Any codes available?

The Lambda (oxygen) sensor might help if it is bad (should ber a check engine light on if it's bad). I always go with Denso brand.

Plugs...if one or more are not firing, your engine would run rough. If they are old, they might contribute to the failed test.

My daughter's 2.2L failed because of a bad vapor canister valve (purge or vent, can't remember).

Give us more info.
 

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Discussion Starter #4 (Edited)
Thanks for the feedback.


There has never been a check engine light since I bought the car one year ago. It lights up on ignition, so it works.
I don't have any codes cause I don't have the cable to connect car and laptop. (I can go back and ask the mechanic tomorrow if needed).



On the testpaper it says:
* CO idle, tolerated under 0.5%, test-value: 0%
*CO acceleration, tolerated under 0.3%, test-value: 0%
*Lambda (NOX I guess), tolerated range 0.97 to 1.03, test-value 1.100


I'm living in France and I just wrote down what's on the paper.


I had a Audi diesel from 2001 where the check engine light was caused by the O2 sensor on the intake.


The sensor the mechanic indicated on my Camry is on the outtake/(beginning of manifold? It's this one:


I found this video of how to check lambda/O2 sensor by measuring for resistance on the heater circuit:
www.youtube.com/watch?v=_Kr-c8eBl5E
 

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Maybe best to have mechanic do the work if he will stand behind his diagnoses.



Lamba of 1.1 indicates engine running a bit lean which means too much air or too little fuel or sensor/combustion off.
 

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Discussion Starter #6
Hi CJ1


It's simply that I want to know my car better.
For example before I had an 1990 diesel vanagon from 2001 to 2018, and at the end I knew it pretty well. I took the engine apart and put it back together myself and I liked being able to do it, (it came out great even).
Will my camry last 17 years?
If it doesn't I'll get another, maybe the V6, I like my Camry.
 

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Scan tool essential for diagnosing emission problems.

Inexpensive ones that work with smart phone is a place to start.
 

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On the testpaper it says:

*Lambda (NOX I guess), tolerated range 0.97 to 1.03, test-value 1.100

- Bojour mah french friend
- Merci bocoo
- You are running RICH (not lean, you have a narrow band O2 sensor)..

- in the USA as long as the check engine lite is not on you would pass.. at least in CA..

- start simple with air
- then do spark
- then do fuel

- check your air filter, clean throttle body... if good then:

- if good check your spark plugs and WIRES... if good then:

- get some fuel pressure readings.. a failed regulator will let too much fuel through.. so will worn injectors..





Ovua! Merci! Amigo!







:)
 

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Discussion Starter #10 (Edited)
ça va mec!
(my man)


That's the stuff I was hoping for.

It's running rich. So I checked air, then EGR, and infact the egr piston was stuck in closed position. I prodded it with a flat screwdriver to see how stuck it was and voila! it suddenly came loose. (Hopefully not too many chunks of carbon went into the injectors.)
The idle is now a bit lower, (and it dies if I hold the piston open, meaning it is not all clogged in there).
The piston moves freely when I give gas.


Question is, do I benefit further from taking off the valve and cleaning it properly?

I didn't do it today as I didn't have the tube of RTV silicone I use as sealant, because Camry-parts are close to non-existent in France.


Merci a bunch
 

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a
- Lambda of 1.1v on a narrow-band is RICH:

Lambda is not expressed in terms of voltage.
A narrow band O2 sensor changes voltage .01 - ,09 lean to rich.
A wide band O2 sensor Or, A/F ratio sensor shows up on a scan tool as around 3.3 volts ideal but, that is interpeted voltage because the A/F sensor actually changes amperage in response to changes in ratio. It is in milliamps so not really measurable.
 

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Discussion Starter #12
...also checked resistance in the O2 sensor and it tests just fine

not like this one (at 1min 20sek)
 

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ça va mec!
Question is, do I benefit further from taking off the valve and cleaning it properly?

I didn't do it today as I didn't have the tube of RTV silicone I use as sealant, because Camry-parts are close to non-existent in France.


Merci a bunch

- Bonjour! mah French burutha!
- Greetings from California
- A closed egr port is irrelevant
- An OPEN egr port is essentially a vacuum-leak and will make you run LEAN
- this is why engine stalls when you suck on the EGR valve with the engine idling

- please check again for codes
- something is making your run rich...











:)
 

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...also checked resistance in the O2 sensor and it tests just fine

not like this one (at 1min 20sek)
www.youtube.com/watch?v=_Kr-c8eBl5E&t=149s

- Merci
- the sensor is fine
- you have either not enough air, or too much fuel
- do the stuff I suggested yesterday...

- check airfilter (i recently had a dead rat in mine) and TB
- of OK, then get some FP readings and report back
- check the wires... mist with water to see if they induce a misfire..

BONJOURE`!!!!








:)
 

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Discussion Starter #17
The EGR not operating properly can upset the A/F ratio( lambda reading).

Makes sense to me, not running some of the exhaust a second time through the combustion chambers should make emissions worse.
But if it were so, than there ought to be too much carbonmonoxide, CO, in the emission as well, or not?





NOx was too high?
1-4 oz of TC-W3 marine 2-cycle oil in gas an it will read zero.

Thanks for this tip Ted.

I guess it is NOX, the CO levels were 0%.

I bought this oil last summer following the suggestion here on TN and used it on every tank for months. But this year I let it be.
Should I drive through one tank of it, then put CLEAN gas for the test, like this guy said?
https://www.toyotanation.com/forum/103-camry-3rd-4th-gen-1992-1996-1997-2001-1st-gen-solara-1999-2003/1561658-tc-w3-oil-my-burning-new-love-smog.html
 

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Go ahead and put 1 ounce per 5 gallons of gas and get the test. It will test better with the TCW-3 oil in the gas. I have been running it in my gas for 7 years.
 

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Discussion Starter #19
Success, test passed.
Thanks everybody, beers on me.





Nox read 1.03 when before it was 1.10, so I was just within limits.
 
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