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- 2009 Toyota Corolla misfire
2009 Toyota Corolla misfire
- tim.smith1
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- Weycraze
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What are the fuel trims doing at idle and high rpm? Are the O2's responding properly?
Does the car have any unusual vibrations when in gear?
Thanks
Paul
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- pjjohnson
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- Cheryl
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- tim.smith1
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www.mediafire.com/file/dftfk6rxrix7mgi/2...5_21.48.33.pids/file
www.mediafire.com/file/26ie6ei36qofhl2/2...5_22.16.57.pids/file
go to snap-on and download the free program shopstreamconnect to view files then open with shopstreamconnect.
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- tim.smith1
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www.mediafire.com/file/szui8u8liuruist/t...9_both_cams.vsm/file
www.mediafire.com/file/5qpy5384a7ookm8/corrolla.vsm/file
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- Tyler
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The ECM is definitely forcing open loop in response to a perceived misfire. Happened right after a part throttle acceleration. It's interesting that the upstream A/F sensor doesn't show a lean condition during the acceleration.
Like pjjohnson suggested, mechanical is definitely the next step. I've seen several of these engines blow head gaskets between cylinders.
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- cheryl hartkorn
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- tim.smith1
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- tim.smith1
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- Andy.MacFadyen
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- Tyler
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tim.smith1 wrote: i asked for help on iatn but i guess you cant reply to a help request that you started on iatn so i dont think i will be doing that again lol
You can update your help request... Once.

Has anyone been monkeying around with this thing before you? Wonder if an ECM got swapped at some point, and there's some kind of crank pattern learning required. Just speculating, since you've said you don't feel any misfires.

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- PDM
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I guess a transmission problem could be a culprit
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- rockp2
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- Andy.MacFadyen
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- tim.smith1
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www.mediafire.com/file/9zflp692zdopslb/2...1_17.16.15.pids/file
www.mediafire.com/file/6prj9gfluibi3dj/2...1_17.35.49.pids/file
because i did not save the compression test screen shot and this looks more and more like mechanical problem i decided to revisit the compression this time with a gauge it showed between 165 and 175 per cylinder i then decided to do a running compression test with the gauge (since i dont have a kewl pressure transducer for my scope ) it seemed that it was about 40-50 hard to read of course and around 80 to 100 psi on a snap throttle all cylinders the last thing i did was a cylinder leak down with shop air it seems that an exhaust valve is leaking on cylinder two all the other cylinders seem to be great including number 4 just wanted to close this one out sorry for the delay i have been crazy busy.
again i cant say it enough thanks to all that helped and thanks for all you guys do!!!!!!!!!!!!!!!!!!!!!
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