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Cylinder no.2 misfire CEL

Old 01-28-2015, 07:29 PM
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Default Cylinder no.2 misfire CEL

I have a 2001 Hyundai Tiburon w/ 130,000 miles on engine that's throwing a CEL cylinder number 2 misfire



I have replaced #2 fuel injector, ignition coil, and checked the spark plugs



after resetting the ECU the CEL comes on again after an hour or so of relentless driving









examples:



when depressing gas pedal when going up slight inclines I can trigger the cel by giving it a lot of gas and it gives up and goes into limp mode again



or on the highway constantly at 65 MPH now it starts to sputter out the exhaust ( a spitting sound ) and the CEL comes on again putting it into limp mode an d it runs fine like that.



What could this be?









Thanks





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Old 01-28-2015, 07:56 PM
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I also replaced the timing belt a 1,000 miles ago
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Old 01-28-2015, 10:25 PM
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Last misfire episode I had was a bad spark plug wire.
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Old 01-29-2015, 12:46 PM
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Have you moved the spark plugs and plug wire to a different location to see if it follows to the next cylinder? That would be the easiest check first.
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Old 01-29-2015, 07:31 PM
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The wires are location-specific, can't swap em around without a second set. Usually my car is reliable for long enough that when wires are suspected they are also old, and I just change them out with new.
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Old 04-02-2015, 01:37 PM
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I replaced the spark plug wires and now there is no misfire.
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Old 04-02-2015, 09:26 PM
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I LOVE when that happens.
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Old 07-10-2015, 08:42 AM
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misfire has returned could oxygen sensor cause this? I suspect a burnt valve, car emitting black smoke as well sometimes. Picking up a low mileage cylinder head from a local junkyard
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Old 07-10-2015, 09:35 PM
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if you are getting black smoke, it's gas and your tuning is off. A bad oxygen sensor might cause that. Get a code reader on it, and see what it says. Better yet, step up your coder reader to mid-grade, and see what the O2 sensor is saying in real time and check out your fuel trims.
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