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#1
06-30-2010, 03:35 PM
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P303 Misfire 2003 Hyundai Tiburon
I am getting a P303 misfire on our 2003 Hyundai Tiburion. Put in new spark plugs and wires. Same error code. Any advice or help would be greatly appreciated.
Thanks, Eric 
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#2
06-30-2010, 09:51 PM
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Re: P303 Misfire 2003 Hyundai Tiburon
Welcome to the forum! Does your 2003 Tiburon have Coil on Plug (CoP) or a coil pack? If CoP, try swapping the #3 coil for one of the coils on another cylinder and see if the misfire follows the coil or stays on the cylinder. If it follows the coil, then you probably have a bad coil. If it stays on #3, then closely inspect the fuel injector connection and wiring. If that looks good, confirm you have good compression on #3 cylinder.
-Rod
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#4
07-01-2010, 07:26 AM
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Re: P303 Misfire 2003 Hyundai Tiburon
Yeah, if you have no spark plug wires and a coil mounted directly on the plug, you have Coil on Plug. If you have spark plug wires going from a central coil pack to the spark plugs, you do not. I suppose since you said that you put in new spark plugs and wires you do not have CoP, but some people are just so used to saying "plugs and wires" that they don't necessarily realize they're saying that.
-Rod
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#5
07-03-2010, 03:19 PM
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Re: P303 Misfire 2003 Hyundai Tiburon
Okay switched 2 and 3 wires from the coil. Reset the codes and drove the car for few miles and same code appears P303 misfire on Cylinder 3.
Anything else I can try? Thanks again for your help. Eric
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#6
07-07-2010, 01:43 AM
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Re: P303 Misfire 2003 Hyundai Tiburon
First thing would be to check the injector; both to see if its firing, and then to see if its delivering the proper fuel. If those check out, do a compression test. If cyl 3 is low, time for a rebuild or just pull the bulb for the engine light
 Low compression could be from bad/cracked rings, blown head gasket, or poorly sealing valve, but start with the easier stuff first.
__________________
Dragging people kicking and screaming into the enlightenment.
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#7
07-07-2010, 02:36 PM
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Re: P303 Misfire 2003 Hyundai Tiburon
Could I switch the injectors and see if the problem moves? What tools do I need to do a compression test?
Thanks for the help everyone. I hope I can get this fixed.
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#8
07-07-2010, 04:03 PM
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Re: P303 Misfire 2003 Hyundai Tiburon
Quote:
http://www.autozone.com/autozone/accessories/Actron-2-1-2-in-compression-tester/_/N-25j0?counter=1&itemIdentifier=87580_0_0_
__________________
1989 Caprice Classic Wagon, Olds 307 ,SMI Q-Jet, 200R4 w/Shift kit, Flowmaster 50, Hotchkiss sway bars, KYB Shocks. Jet Chip, 1989 Mustang LX 5.0 5sp convertible 1992 Camry LE 2.2 1996 Suzuki RMX250 I'm a victim of circumstance [ 
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