Main IndexAuto Repair Home Search Posts SEARCH
Who's Online WHO'S
Log in LOG

2001 Kia Sephia -Cylinder Misfire

  Email This Post

New User

May 17, 2007, 9:56 PM

Post #1 of 4 (3366 views)
2001 Kia Sephia -Cylinder Misfire Sign In

I have had this problem for about a year now. A year ago my check engine light went on. Code P0301 - Cylinder 1 misfire. Car has about 145,000 miles so replaced all spark plugs. Car had sat a while before a changed the spark plugs. Then ran great for about a day. Same code again thought it was spark plug wire - replaced them still having problem. Took it to someone to fix it. Same code he replaced spark plug worked great for a day or two. Same problem P0301. I just swapped cylinder 1 and 2's plug cylinder 2 misfire. About a 1 month ago it came up with knock sensor light saying it was out of range thousght this was due to spark plug mistfire? Recently I changed the spark plug again and for a day it ran fairly well still misfire every once in a while. Now it misfire all the time again. I am also getting a Gera 4 and Gear 3 incorrect ratio message. I have not been able to drive this car for almost a year now due to this problem. Can anyone help? Could it be a bad knock sensor? Bad Fuel pump? The misfire usually happen when I speed up and at idol every once in a while after I take my foot off the gas. Please Help????

Tom Greenleaf
Ultimate Carjunky / Moderator

May 18, 2007, 8:16 AM

Post #2 of 4 (3362 views)
Re: 2001 Kia Sephia -Cylinder Misfire [In reply to] Sign In

The problem seems to follow that plug - new or not. Use only the plugs origninally recommended for the vehicle. Don't fool with those. If a cylinder is isolated all the time an investigation on that needs to be done.

Plugs can have problems right out of the box. They don't like being dropped either before you got them or when you install them. Any dropped plug should be looked at carefully and take note of where it went if you use it. Don't buy plugs if the box is damaged at the counter and ask for another right then.

Also: Cars don't like sitting around and if outdoors even less. If not for too long they will recover but odd things happen all over a car that hasn't been used in a long while,

Long retired now


May 19, 2007, 4:35 AM

Post #3 of 4 (3359 views)
Re: 2001 Kia Sephia -Cylinder Misfire [In reply to] Sign In

My question is does this have the coil on plug ignition system? If it does, swap the coils and see if the misfire code follows the swap. If it does, replace the coil. If it stays on that cylinder, you should check the wiring to the coil to see if there is an intermittent open circuit. If it checks ok, disconnect the PCM and check the driver wires for corrosion, loose, or backed out pins.


New User

May 26, 2007, 5:32 PM

Post #4 of 4 (3355 views)
Re: 2001 Kia Sephia -Cylinder Misfire [In reply to] Sign In

It does have a coil ignition. I have since changed the Coil packs thinking it was them and still have the problem. I had one of those FUEL BOSS things on the gasoline line that leads to the cylinders. Do you thing a strong magnetic force could cause the spark plug to go bad? It still does it after removing it however maybe the plug just need to be replaced to fix the problem now?

2001 Kia Sephia -Cylinder Misfire

  Email This Post

Latest Forum Post
When the car is at idle there is no strange sounds. However, once the car reache...
I have a 1987 Chevy Caprice. The Major problem with the car is the hesitation. I...
 HotOil warning, from cold start, and won't start, Jeep JK wrangler 2010 un...
1970 Datsun 240Z. Some relays added on (headlights, wipers, heater motor) 40 ove...
Hi, I have a question in regards to alternators. I'm currently on my 3rd alterna...

Feed Button

Used Car Search
Used Car Price Ranges:
Under $5,000

Over $45,000
Search used Cars By Manufacturers:
Used Acura
Used Audi
Used BMW
Used Buick
Used Cadillac
Used Chevrolet
Used Chrysler
Used Dodge
Used Ford
Used GMC

Used Honda
Used Hyundai
Used Infiniti
Used Jaguar
Used Jeep
Used Kia
Used Land Rover
Used Lexus
Used Lincoln
Used Mazda
Used Mercedes-Benz

Used Mitsubishi
Used Nissan
Used Porsche
Used Saab
Used Scion
Used Subaru
Used Suzuki
Used Toyota
Used Volkswagon
Used Volvo
2010 Honda Civic
2004 Jeep
2012 Mustang
1997 Honda Cr-V
2010 Toyota Prius
2010 BMW 328

Automotive Forum Categories
Automotive Repair
Auto Body Repair and Refinishing
AC Auto Repair Help Forum
Automotive Wiring and Electrical

Auto Insurance and Car Financing
Automotive World
Brake Systems
Car Stereo Repair Advice
Car Troubleshooting
Engine and Car Noises
Engine Fault Codes
Engine Troubleshooting
Exhaust System Repair

Steering and Suspension
Tricks of the Trade
General Discussions
Car Shows and Events
The Bargin Bin
Motor Vehicle Inspection
Car Care Tips
Traffic Ticket Help
Car Racing

Gasoline, Motor Oils, Concept Cars
Remote Control Cars and Vehicles
Truck Repair
Truck Repair Advice

Truck Engine Repair
Truck Suspension Repair
Motorcycle Repair
Motorcycle and ATV Repairs

Motorcycle Body Repair
Motorcycle Clutch Repair
Motorcycle Engine Repair
Motorcycle Seat Repair
Car Forum Posts - Sitemap

Search for (options) Privacy