can't pass smog----O2 and Cat not ready - Team Integra Forums - Team Integra
 
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post #1 of 8 (permalink) Old 03-05-2019, 12:13 AM Thread Starter
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can't pass smog----O2 and Cat not ready

2 of my readiness monitors (O2 and Cat) are not ready. No check engine light. Anyone has any idea what I can do to get these monitors ready? Was told to drive more but I have done many drive cycles trying to set them. But not successful. Anyone has any idea?
Car is 97 Integra LS coupe. 326,000 original miles.
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post #2 of 8 (permalink) Old 03-05-2019, 06:55 PM
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How many miles with each drive cycle? City or Hwy driving?





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post #3 of 8 (permalink) Old 03-05-2019, 08:47 PM Thread Starter
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I have driven about 350 miles now---both city and hwy.

Typical drive cycle: cold start, turn AC to max, idle for 10 minutes, turn AC off, accelerate to 50 MPH, hold at that speed for 15 minutes, decelerate to 20 MPH, accelerate to 55 MPH and hold for 10 minutes, decelerate to stop, idle for 5 minutes, turn ignition off.

Besides this drive cycle, I have driven normally as well. Still can't set the o2 and Cat monitors.
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post #4 of 8 (permalink) Old 03-14-2019, 03:57 PM
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It shouldn't take that long to set readiness monitors on a 97 teg. If you have a scan tool that lets you see oxygen sensor data, that would be your best bet at diagnosis.

Once you enter closed loop, O2 sensor 1 should be fluctuating up and down. And O2 sensor 2 should be steady around 0.5-0.8 volts.

If you see O2 sensor 2 mimicking O2 sensor 1, fluctuating up and down, then you will know the cat effeciency is not in spec. If you see anything else, like erratic or slow readings from both or one of your O2 sensors, then it could be a sensor or wiring problem.

I would check LT & ST fuel trims as well. That will give you more indications as to the health of the motor and other components attached to it. Like spark, air, fuel. Fuel trims tell the story. And you can work from there.

On a car with that many miles there are bound to be gremlins in the engine bay.

Hope that info helps. Good luck.
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post #5 of 8 (permalink) Old 03-24-2019, 11:40 PM Thread Starter
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Upstream reading seems normal (fluctuating between .1 and .9 volts). downstream oxygen sensor is constant but at .1 volt. Is this normal?
Trying to determine whether it is the sensor or the cat that is bad.
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post #6 of 8 (permalink) Old 03-30-2019, 12:42 AM Thread Starter
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am I correct that the engine coolant temperate is usually above 190 degree F to be running efficient? It seems my engine coolant temperature is only showing 168F (even though the engine is all warmed up). It doesn't go above it.

This might be causing my O2 and Cat monitors not setting???
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post #7 of 8 (permalink) Old 04-06-2019, 11:15 AM Thread Starter
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fixed----it is the coolant temp sensor

Just want to let people know that the cause of my Cat and downstream O2 sensor not setting is because of the coolant temp sensor. It was giving the ECU a low temperature reading. Changed the sensor and the 2 monitors are ready to go. Now hopefully, my car will pass smog.
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post #8 of 8 (permalink) Old 04-08-2019, 07:00 PM
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Quote:
Originally Posted by pug View Post
am I correct that the engine coolant temperate is usually above 190 degree F to be running efficient? It seems my engine coolant temperature is only showing 168F (even though the engine is all warmed up). It doesn't go above it.

This might be causing my O2 and Cat monitors not setting???
Yes put in a 195F t'stat and retry.
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