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Join Date: Aug 2021
Posts: 87
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02 Sensor Issues - 87 3.2
Help me think through 02 sensor issues for my 87 3.2. I posted earlier that I was having off idle issues until the car warmed up--it will stumble and even backfired once when I gave it a lot of throttle. Once at temp, it will eventually accelerate fine. I read an article on the Pelican (referencing a 944) about symptoms of a failed sensor which include engine not accelerating.
https://www.pelicanparts.com/techarticles/Porsche_944_Turbo/69-EXHAUST-Oxygen_Sensor_Replacement/69-EXHAUST-Oxygen_Sensor_Replacement.htm I hate to throw parts at an issue but not getting a lot of suggestions. I have checked for vacuum leaks. As an aside, I used some break cleaner under the car after an oil change to try and clean some things up. Not sure if that could have harmed the sensor. Also, not sure the last time it was replaced (111k miles). |
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11-17-2021, 12:04 PM
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ok what hapen when you disconnect the oxy sensor?
ivan
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1985 911 with original 501 708 miles...807 421 km "The difference between genius and stupidity is that, genius has its limits". Albert Einstein. |
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11-17-2021, 12:39 PM
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Join Date: May 2019
Location: Atlanta, GA
Posts: 257
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Hey, the o2 sensor is likely not the issue, it does nothing in idle (when idle switch is actuated) and in WOT (when WOT switch is activated), only in "cruising.
Please let us konw a little more about the issue and symptoms. |
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11-17-2021, 12:40 PM
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Join Date: Mar 2005
Location: Northern CA
Posts: 4,703
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I had this and it was the cylinder head temp. sensor.
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Sold: 1989 3.2 coupe, 112k miles |
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11-17-2021, 12:41 PM
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Join Date: Feb 2014
Location: Lomita, CA
Posts: 2,688
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Quote:
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Dave |
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11-17-2021, 03:26 PM
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Join Date: Aug 2021
Posts: 87
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I have not had a chance to disconnect the O2 sensor. Will try when I am back at my shop on Friday.
Car ran fine (had a non start issue and changed the ref and speed sensor) back in the summer, has run fine since Recently changed oil, sprayed some brake cleaner on underside of engine to clean At startup, starts fine, idles at 900 however any gas the car begins to stumble, wont go past 1100 rpm; idles a little higher at 1000 After full warm up, can give gas but stumbles from 1100 to 1300 then revs fine After a few times of this, car revs as normal I have looked for vacuum leaks, checked seal on oil filler, added new gas. I have a 2 wire CHT so I believe it has been replaced but not under my ownership. Last edited by tx63conv; 11-18-2021 at 08:46 AM.. |
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11-18-2021, 08:43 AM
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Join Date: Aug 2021
Posts: 87
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Quote:
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11-18-2021, 08:47 AM
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