Search | Car Forums | Gallery | Articles | Helper | AF 350Z | IgorSushko.com | Corporate |
| Latest | 0 Rplys |
|
Show Printable Version | Email this Page | Subscribe to this Thread |
|
Thread Tools |
02-28-2009, 09:11 PM | #1 | |
AF Newbie
Join Date: Feb 2009
Location: Providence, Rhode Island
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
|
2000 Kia Sephia misfiring randomnly
Hello, I own a 2000 Kia Sephia and it has been running beautifully and getting great gas mileage until just recently. I will say after this problem has occured I have changed the spark plugs and bought a new coil pack for cylinders 2 & 3.
The car will run fine for a little while and then randomnly start misfiring extremely bad. I have to do all I can to keep it from stalling out. It will not misfire constantly but will misfire for 5-10 minutes and then straighten out for awhile. I am not sure what is going on but I have checked all vacuum lines and air intake and all of them seem to be in working order. I have scanned the ECU codes and they have come out P300 P302 P303. Basically the misfire codes for cylinders 2 and 3. Has anyone had experience with this before? Any suggestions would be GREATLY appreciated. I'm going crazy here. |
|
03-23-2009, 03:24 PM | #2 | |
AF Enthusiast
Join Date: Mar 2007
Location: VA in summer, TX in winter, Virginia
Posts: 1,323
Thanks: 2
Thanked 13 Times in 13 Posts
|
Re: 2000 Kia Sephia misfiring randomnly
Here are my guesses: First - do a compression check on all cylinders. If you have bad compression, you can have misfiring. Second - Of course have a look at the color of the plugs. All should be dry and a sort of beige color. Could it be bad spark plug wires? (I dont even know of Kia's have plug wires for 2 & 3.
Next; it could be a couple of fuel injectors that are partly clogged. The only method I know for diagnosis is to swap the cyl 1 & 4 injectors with the 2& 3 injectors, and see if the codes change to misfiring on 1 & 4. Then you could assume its an injector problem. I might just replace the injectors with 'rebuilts'. When injectors for my sister in-law's Toyota Avalon were about $100 locally, I got a rebuilt pair from a guy on ebay for about $40 (including the 'core' charge & shipping). If the misfiring stays on cylinders #2 and #3, I would think it could be wiring harness of PCM problem. |
|
10-19-2009, 01:43 PM | #3 | |
AF Newbie
Join Date: Mar 2008
Location: Santa Monica, California
Posts: 32
Thanks: 0
Thanked 0 Times in 0 Posts
|
Re: 2000 Kia Sephia misfiring randomnly
I am having the same problem and the mechanic said that the plug wires are arcing?
|
|
04-13-2010, 03:17 PM | #4 | |
AF Regular
Join Date: Feb 2004
Location: Aledo, Texas
Posts: 236
Thanks: 0
Thanked 9 Times in 9 Posts
|
Re: 2000 Kia Sephia misfiring randomnly
I'd check your spark plug wires. I had a very similar problem. (with blinking engine light). I pulled out the #1 spark plug wire and there were very small holes that had penetrated through the spark plug boot and it was arcing to the block. I replaced the wires and it's been running perfectly ever since. Good luck.
|
|
04-13-2010, 03:23 PM | #5 | |
AF Regular
Join Date: Feb 2004
Location: Aledo, Texas
Posts: 236
Thanks: 0
Thanked 9 Times in 9 Posts
|
Re: 2000 Kia Sephia misfiring randomnly
I'd check your spark plug wires. I had a very similar problem. (with blinking engine light). I pulled out the #1 spark plug wire and there were very small holes that had penetrated through the spark plug boot and it was arcing to the block. I replaced the wires and it's been running perfectly ever since. Good luck.
|
|
|
POST REPLY TO THIS THREAD |
Thread Tools | |
|
|