4g69 2007 eclipse running on 2 cylinders - Club4G Forum : Mitsubishi Eclipse 4G Forums - 2006-2012 Eclipse Authority
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Old August 11th, 2020, 08:16 AM   #1 (permalink)
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4g69 2007 eclipse running on 2 cylinders

I have a 2007 eclipse 2.4 4cyl. Car ran great before this. Problems began when timing belt gave out while driving. Did compression test and found 6 intake valves bent. Went and had head rebuilt at a shop and then I went and put everything back together, aligned all the timing marks to tdc. I went to fire up the car and it started and ran at idle roughly and sounded funning like it was missing. A couple codes came up like cam position but I believe it was just because it was unplugged. I cleared the codes and it didnt come back. So I did some checking and found that cylinders 1 and 3 are working and firing but cylinders 2 and 4 are not running. I have double checked everything but cannot find any problems as to why just those 2 cylinders wont fire. The car will run and drive but barely. After a few minutes of driving the car throws "system to lean codes" which I would imagine is from the 2 cylinders not firing.

I also rechecked the compression on all 4 cylinders and all are at 180psi.

Has anyone ever encountered this? Any helps is very much appreciated.
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Old August 11th, 2020, 10:43 AM   #2 (permalink)
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How do u know those cylinders aren’t firing?
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Old August 11th, 2020, 12:15 PM   #3 (permalink)
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I pulled the spark plug and the injector to both cylinders 2 and 4 and the engine never changes its beat but when I pull the other cylinder 1 and 3 plugs the engine dies almost immediately
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Old August 11th, 2020, 01:17 PM   #4 (permalink)
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Are you getting misfire codes
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Old August 11th, 2020, 01:54 PM   #5 (permalink)
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No missfire codes
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Old August 11th, 2020, 07:55 PM   #6 (permalink)
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Not even a P0300? U should get that right away if u have any misfire, the specific cylinder codes take a little while because the ECU has to take in calculations from the crank sensor to determine which cylinders are misfiring
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Old August 12th, 2020, 06:32 PM   #7 (permalink)
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I completely agree and with the trouble code problem, I'm not sure why it wouldn't throw a code especially when the engine was rotating as rough as it was.

Also an update I found the problem. Cylinders 2 and 4 coil packs were bad.
I'm not sure how this happened. All factory coil packs and none were bad at the time of the timing belt/head rebuild. But I swapped coil packs between cylinders and the problem followed the coil pack but still never gave a misfire code or any code at all. So I bought 2 new ones and engine runs great now.
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Old August 12th, 2020, 07:45 PM   #8 (permalink)
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Good to hear
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Old August 12th, 2020, 07:46 PM   #9 (permalink)
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(Fixed)4g69 2007 eclipse running on 2 cylinders

Thank you for the help!
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