2004 Optima cylinder 4 misfire jerking/poor acceleration - Page 2 - Kia Forum

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post #11 of 37 (permalink) Old 06-15-2019, 11:12 PM
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you said it was sitting a long time, what about bad gas or a rusted out fuel system? basically i would say take it to a pro and spend 100-200 on diagnosis since you dont really know the history of the car so much. 20000 miles is like hard to believe. theres gonna be some weird problem there becuase of the low kms.

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post #12 of 37 (permalink) Old 06-16-2019, 08:38 AM
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Tried test driving the car after putting the new spark plug wires in and new camshaft sensor.. after about driving fine for a few minutes the engine suddenly lost power to a crawl of only 15-20 mph. Even when the pedal would get pushed to the floor basicly it would not go any faster.
You need to scan again for codes, because there must be something else going on, beyond just one cylinder misfiring.
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post #13 of 37 (permalink) Old 06-16-2019, 08:15 PM Thread Starter
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you said it was sitting a long time, what about bad gas or a rusted out fuel system? basically i would say take it to a pro and spend 100-200 on diagnosis since you dont really know the history of the car so much. 20000 miles is like hard to believe. theres gonna be some weird problem there becuase of the low kms.

since i bought the car i have gone through 5 to 6 tanks worth of gas. i looked up the history of the car and seen the car was used and serviced the first 10 years of the cars life. the last 4 years it was driven occasionaly. i was thinking to do a last effort of getting some chevron to see if it helps the problem at all, before i take it to a shop to diagnose as i am really tight on $$ right now i dont think id be able to take it in for a little while unfortunately this is my only car and cant really get around and have to use public transportation to go anywhere farther than a few miles..

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post #14 of 37 (permalink) Old 06-16-2019, 08:17 PM Thread Starter
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You need to scan again for codes, because there must be something else going on, beyond just one cylinder misfiring.
i have been plugging in my obd2 in every few days to see if it is picking up any codes but it has no stored or pending codes which is frustrating. the only code it ever had since i had the car was a p0304.

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post #15 of 37 (permalink) Old 06-16-2019, 09:51 PM Thread Starter
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this is the first code that the scanner detected about a month ago..



the last picture is what it read today ....

there is an X next to the CAT and EVAP.
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Last edited by seanm1001; 06-16-2019 at 09:52 PM. Reason: forgot to write something in my post instead of making another post
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post #16 of 37 (permalink) Old 06-17-2019, 09:07 AM
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i have been plugging in my obd2 in every few days to see if it is picking up any codes but it has no stored or pending codes which is frustrating. the only code it ever had since i had the car was a p0304.
There are not many issues which can produce the symptoms you describe, without setting any trouble codes. Two things that come to mind are a plugged exhaust system (cat, muffler, pipe), and a bad crank sensor (which sometimes doesn't generate a code). You can test for a plugged exhaust by removing the upstream O2 sensor, and taking it for a short drive to see if the symptoms are noticeably reduced. This would of course be loud, so you'll have to decide if you can get away with making a racket for a few minutes.

Unfortunately, a bad crank sensor signal cannot be diagnosed without a scope. So although I previously recommend against hanging on more parts, in this case having a shop check the crank sensor signal would probably cost more than it would to buy the part. So replacing that sensor would likely be the best way for you to proceed.
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post #17 of 37 (permalink) Old 06-18-2019, 08:27 AM Thread Starter
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Okay so for removing the upstream o2 sensor , I want to try and see if it drives better but do I have to remove the sensor completely or can I just disconnect the wire to it to see if the car accelerates better?

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post #18 of 37 (permalink) Old 06-18-2019, 08:38 AM
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Okay so for removing the upstream o2 sensor , I want to try and see if it drives better but do I have to remove the sensor completely or can I just disconnect the wire to it to see if the car accelerates better?
To assess whether you have a choked CAT, remove the O2 sensor from the exhaust allowing it to vent the exhaust gas through the open O2 port.

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post #19 of 37 (permalink) Old 06-18-2019, 09:17 AM Thread Starter
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Ur talking about the down stream o2 sensor u mean?

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post #20 of 37 (permalink) Old 06-18-2019, 09:38 AM
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Ur talking about the down stream o2 sensor u mean?
If you're trying to assess a potentially blocked CAT, then it would be the upstream O2 sensor that needs to be pulled.

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