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May 14th, 2010, 01:27 PM
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 #1
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Newbie
2000 Mustang GT
Join Date: Jul 2008
Location: Chicago
Posts: 31
 iTrader: 0 reviews
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Code 303 Cylinder 3 Misfire?
So I was driving my car today and it started to run like crap. The SES light came on and it threw Code 303 Cylinder 3 misfire? What would cause this? I just replaced the plugs about a week ago! Thanks!
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2000 Mustang GT 5 Spd, MagnaFlow Exhaust, Densecharger CAI, Steeda Timing Adjuster, Mach 1 Grille Delete, Carbon Fiber GT Hood. Ford Motorsport HD Clutch. |
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May 14th, 2010, 01:44 PM
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#2 |
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Newbie
2000 Mustang GT
Join Date: Jul 2008
Location: Chicago
Posts: 31
iTrader: 0 reviews
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I'm guessing a bad COP? Do these go bad often?
__________________
2000 Mustang GT 5 Spd, MagnaFlow Exhaust, Densecharger CAI, Steeda Timing Adjuster, Mach 1 Grille Delete, Carbon Fiber GT Hood. Ford Motorsport HD Clutch. |
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May 14th, 2010, 01:45 PM
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#3 |
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Banned
2004 Mustang GT
12.35@114.08 w/ 1.88 60'
Join Date: Feb 2009
Location: Waterloo, IA
Posts: 7,014
Blog Entries: 2
 iTrader: 7 reviews
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It's not real common for them to go bad, but it might have. Do you have a friend that could pop one off thier car and see if it fixes it?
If the COP and injectors are ok, the problem almost has to be internal
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May 14th, 2010, 03:29 PM
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#4 | |
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Newbie
2000 Mustang GT
Join Date: Jul 2008
Location: Chicago
Posts: 31
iTrader: 0 reviews
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__________________
2000 Mustang GT 5 Spd, MagnaFlow Exhaust, Densecharger CAI, Steeda Timing Adjuster, Mach 1 Grille Delete, Carbon Fiber GT Hood. Ford Motorsport HD Clutch. |
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May 14th, 2010, 08:10 PM
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#5 |
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Mach1 FTW
04 Comp. Orange Mach1
Join Date: Apr 2009
Location: Millersburg, PA
Posts: 2,097
iTrader: 11 reviews
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i had a similar code before when i got my 4v swap done on my GT. turns out a vaccum leak played a big part in it. check your vaccum lines 1st. another trick is to replace the #3cyl COP with another COP from a diff. cylinder and see if the miss follows the change. if it isnt the COP or the plug, then like you said its probably the injector.
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June 21st, 2010, 01:54 PM
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#6 |
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Newbie
2002 Mustang GT
Join Date: Jan 2010
Location: San Antonio, Texas
Posts: 31
iTrader: 0 reviews
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I have cylinders 1, 2, and 3 missfiring, what should i check first?
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June 21st, 2010, 04:16 PM
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#8 |
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Newbie
2002 Mustang GT
Join Date: Jan 2010
Location: San Antonio, Texas
Posts: 31
iTrader: 0 reviews
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yes
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LinkBack to this Thread: http://www.moddedmustangs.com/forums/99-04/165876-code-303-cylinder-3-misfire.html
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| Posted By | For | Type | Date | |
| Ford Misfire Cylinder 3 - Kosmix : Reference, Videos, Images, News, Shopping and more... | This thread | Refback | July 2nd, 2010 11:31 PM | |
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