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Old 08-02-2022, 11:05 PM   #1
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Happierfeet is on a distinguished road
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Default Weird misfire 2003 2.2 ion

My Girlfriend has a 2003 Saturn ion 2.2. shes had this intermittent misfire for a bit now. Not enough for a the engine light to come on but it's stored in the ecm, code po300 on my blue driver scanner. It usually happens on cold start. It'll do a couple weird misses then after about 30 seconds itll smooth out. but then it'll have misfire when revving the engine from idle speed. When a smooth acceleration is applied it's fine but sudden revs cause a miss. She does a transmission that sometimes slips between 2 and 3 but not sure if that's relevant.

I've attached some live data I thought would apply from my scanner and a video of how the car is running

We have changed the spark plugs and gaps them correctly so far. fuel pressure is good, air filter cleanish. We put on another coilpack from my mom's hhr that's running fine and it started running harsher with the original one weirdly. I

Any guidance would be appreciated
Thank you
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Old 08-06-2022, 07:21 PM   #2
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Bessarion is a jewel in the roughBessarion is a jewel in the roughBessarion is a jewel in the rough
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2003 ION-2 Sedan
Default Re: Weird misfire 2003 2.2 ion

Replace coil pack and ignition module. Report back.
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Old 08-07-2022, 09:51 PM   #3
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2007 ION-2 Sedan
2007 VUE 3.5L
Default Re: Weird misfire 2003 2.2 ion

Does your scan tool do special tests?
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