2005 Arc Idle Stumbles After Replacing O2 Sensor - Saab 9-5 Bulletin Board - Saabnet.com
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2005 Arc Idle Stumbles After Replacing O2 Sensor
Posted by Roger (NAWC) (more from Roger (NAWC)) on Sat, 16 Jun 2018 13:46:52
My wife's 2005 Arc sedan threw some check engine lights indicating the O2 sensors are bad (P0331, if I recall). The sensors had about 80k miles on them, so I figured they were due to be replaced. Now, when cold, the car starts fine, but after a few seconds, the idle stumbles. It'll stumble down to 600 or 700 or so, then ramp up to about 1100. After the engine warms up, it seems to be fine.
I first thought it's a vacuum leak, but ir threw a CEL saying multiple random misfires. I also didn't notice any loose vacuum lines when I changed the O2 sensors, although I wasn't really looking for any.
Any ideas? Maybe a dirty throttle body or MAF? Spark plugs only have about 10k miles on them, and the DI cassette (genuine Saab) has about 65k miles on it.
Thanks in advance.
posted by 72.9.11...
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