O2 Sensor

I had a similar problem with mine. I have change all O2 Sensor, no result. I just put a injector clean in gaz tank, and a few miles after engine light turn off. I had the same problem a few month later, i did the same thing and it works again, so now i add a bottle of injector cleaner every oil changement and it seem to be all OK.

Try this, it's less expensive that changing the O2 sensor. You can find that bottle in a normal part supplier

Cedric

 

Thanks for the reply. I just got the vehicle and added some seafoam to the gas tank, but, I also have a rough idle and it stalls most of the time when I decelerate.

 

is it not:
HO2S Heater Circuit Malfunction Bank 1 Sensor 1 ?

this says , the heater is open
or
it is too slow to heat O2 sensor to the proper temperature quick enough. [ OBD MONITOR software test]

Seafoam is great for fouling O2 sensors, never use it. " see smoke , then you are killing your very expensive sensors."
if you must throw something IN THERE , Techron FI cleaner is safe ( mostly benzine and xylene ,costs more and is safe. )

Using after market O2 sensors is ok if: (assuming bare lead variety)
1- correct part number
2- you solder the connections using special flux (ask me) ( butt splices are NO GOOD , unless you have the fancy water proof kind, I dought you do)
wire nuts , NO. twisted with electricians tape, NO., now you see why most people cant get it correct.
3- you connect it with the correct color code , cross over rules.

if the above is done, then I guarantee the Bosch will work. ( the prewireds are up to $100 more expensive but are PLUG and PLAY)
if you desire to save money , you are obliged to do it correctly. ( or will be doing it again soon)

BUT...
FORGET ALL THAT.
I suspect your car is busted, it is running badly.
explain that first.

DeAccel DIE ? define Rough Idle?
I think you have an air leak , sounds like your ISC,IAC is leaking air and is all clogged up with PCV vapor contaminations (common).
Your engine can not control its idle curcuit. Is my GUESS.
other commons:
EGR stuck open. ?
ISC,IAC stucking,
MAF is dirty. special cleaner needed.

Factoid:
The OXY sensors have special SST wire the are hard to solder. But there is a cheap flux that solves that riddle.

tells us more.

 

jtgh, I have used seafoam in my 95 Tracker (only 1 O2 sensor)with no problems and my mpg increased, presently averaging 27 mpg. On my 97, I did find a vacuum hose feeding the reservoir disconnected which is probably the source of my rough idle. I installed an OEM HO2 sensor but haven't had time to start it to see if it throws a CEL. I'll keep you posted. Thanks for the help, Dave

 

well ,then forget GAsoline just burn Seafoam.

take that test:
actually look what's in the Seafoam ( msds.... click ,click ....)
then
look up what it says never to expose your oxygen sensor to.
at every major sensor mfg. Bosche, NipponDenso, etc.

bingo , you did it on your own.

if you must, try water injection , it cleans out carbon and doesnt frack up the works. just go easy.
YMMV.

 

Update; OEM HO2 sensor seems to be working (no codes) and idle is fine. Does anyone think the disconnected vacuum hose had anything to do with the HO2 code? In other words, do you think the vacuum problem could have exacerbated a marginal HO2 condition? Just curious. Thanks, Dave

 

yes, in fact the factory service manual for EFI says exactly just that.

the ECM monitors are very primative on this computer.
1- first fix mech ( including vacuum leaks)
2- then fix everything else ( all sensors, solenoids valves, Oxy sensor,etc)
3- then egr sys. last (code 51)

 

Thanks for your help.

 

oxy wiring.

for those wanting to make up there own Bosch Oxy sensor.
I made the below dwg. off bosch site and added my exact wiring.

my exact wiring is in RED words.
The bosch sensor has 3 wires, black, white , white.
the whites are the heater and the back is the 1volt signal wire to ecu.

the Bosch comes with a new hitech waterproof splice kit,
sweet.

 

Good stuff JT! (your input that is)

I'm personally on the fence about Seafoam though. What you mentioned initially made sense to me. I did a little research and the Seafoam company states that their stuff is "Oxygen sensor safe"
Sea Foam
That's a pretty bold statement. If it wasn't (safe that is), they would be subjected to a lot of grief from us consumers, no?

 

safe sometimes means:
you will never prove other wise.
Think how rich some are selling 25cent bottles for $15.?
deep pockets they have and rich lawyers,

remember slick50 and how long that took.

snake oil its called in the business.

I never mix chemistries unless I am desperate.
I never do it just for fun.
In fact most owner manuals say exactly that.
a little message from the engineer the designed the engine.

IMHI, YMMV.
and desperation is real;
like , my injectors are dribbling, dang!