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Old 11-03-2019, 03:51 AM   #1
mjollnir79
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Default P0302 Cylinder 2 misfire detected

Open loop due to insufficient temperature.



This is with a 1996 Saturn SL2.


This is my wifes car. Happened after having a hell of a time with getting a new crossmember in. Had to muscle around the engine quite a bit.


This reminds of an issue with my old SL2 I had before my current car, an ION.

It was a temperature sensor.

Could this be it?
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Old 11-03-2019, 12:57 PM   #2
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Default Re: P0302 Cylinder 2 misfire detected

Ok changed the engine coolant temp sensor. Still getting the "Open loop due to insufficient temperature." or fuel system status though. But car now turns over no prob.

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Old 11-03-2019, 01:56 PM   #3
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Default Re: P0302 Cylinder 2 misfire detected

Probably your seal on your thermostat is shot allowing coolant to bypass the thermostat, or the thermostat isn't closing correctly. Either way, probably time for a new thermostat. Double check and make sure you have a brass tipped coolant sensor and clean corrosion free connector as well. Doesn't have anything to do with your cylinder two misfire though as your title of the thread though.

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Old 11-03-2019, 02:23 PM   #4
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Default Re: P0302 Cylinder 2 misfire detected

mjollnir79, with a reader on hand and if the t-stat is running cooler than expected, use your reader to monitor actual coolant temps. With a new coolant sensor, initial temps should be close to ambient at ignition on time, cold engine. When warmed up, coolant should be between 185F-195F. If below 185F, replace the t-stat.

P0302 cylinder #2 misfire may be; faulty spark plug, spark plug wire, lost compression, etc.

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Old 11-03-2019, 02:45 PM   #5
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Default Re: P0302 Cylinder 2 misfire detected

I cleared the code after I changed the sensor and it's not coming back. Seems fine for the most part. RPMs are good.

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