P0320 & P0305 and loss of power - Kia Forum
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post #1 of 4 (permalink) Old 09-22-2011, 05:27 PM Thread Starter
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Default P0320 & P0305 and loss of power

First the Symptoms:

The tachometer in my 2005 Sedona started behaving erratically the Check Engine light would come On and Off over the course of a few weeks and eventually the tachometer stopped working completely.

The codes:
When the tachometer stopped working completely and the Check Engine light stayed on permanently it had the following 2 codes:
P0320 Ignition Failure Sensor
P0305 Cylinder #5 Misfire

The repairs so far:
I got a replacement Ignition Failure Sensor online for about $80. With that the tachometer started working again.

The Remaining Problem (Need help figuring this out)
The engine doesn't seem as powerful as before all of this happened. The engine has to rev up to 3000 RPMs to shift from gear to gear, and the transmission shifts are very sluggish.

What could be causing the loss of power???

I have not replaced any spark plugs or ignition coils, I'd figure I'd do this one step at a time to pin-point the root cause.

I've seen some post online saying that this might have to do with a damaged PCM but there wasn't a lot of details behind that.

Any help would be appreciated, Thanks :-)
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post #2 of 4 (permalink) Old 09-24-2011, 07:03 PM
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Hi padillaj3,
Since the loss power is after the ignition problem, maybe you need to check on the electric-ignition portion. Please refer to the attached file. Check on the ignition coil & High tension lead cable.
Attached Files
File Type: pdf Electrical-ignition.pdf (620.1 KB, 538 views)
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post #3 of 4 (permalink) Old 10-01-2011, 01:46 PM Thread Starter
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Here's an update on the situation:

I checked the front spark plugs and noticed that one of the boots had a small crack. I changed that boot along with the 3 spark plugs (all of which exhibited "Corona Soiling") and noticed a improvement in performance, not to pre-issue levels but still better than it was. See the pictures attached

After a few days I also changed the spark plugs on the back but I did not notice much of a performance change. I'm still using the same cables.

One odd thing I noticed is that while doing the inspection for the ignition coils they all came up with a much higher resistance value than the specs. But I'm not sure if the specs. are right given that there's 2 contradicting procedures in the KIA GIS site (The pinouts are backwards one way I got a reading and with the other I didn't) I've attached both procedures

The Spec. for the Resistance on the Primary Coils is: 0.78 Ohms
All my 3 coils read about 160-180 Ohms
Does that mean my 3 coils are bad?
Also not sure about this next point: The readings I got were only momentaneous, I could not get a continuous reading from any of the primary coils, is this normal?

The Spec. for the Resistance on the Secondary Coils is: 13 Kilo Ohms
My coils were near that range: 11.7 Kilo Ohms

One More question: What is the "High Tension Lead Cable" referred to in the post above? Are those the spark plug cables?
Attached Thumbnails
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Name:	kia sedona boot with small crack.jpg
Views:	1136
Size:	66.3 KB
ID:	9537  
Attached Images
File Type: jpg Kia Sedona Spark Plug.jpg (27.7 KB, 1534 views)
Attached Files
File Type: pdf www.kiatechinfo.com - contentcoil-Maybe Incorrect Procedure.pdf (15.4 KB, 200 views)
File Type: pdf ENG 022r-Correct Ignition Coil Check Procedure.pdf (215.5 KB, 314 views)
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post #4 of 4 (permalink) Old 10-01-2011, 04:09 PM
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With the boot cracked I'd be looking for a new set of wires as they have had better days.
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