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11-03-2004, 04:30 PM
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#1
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Misfire Alert
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Whitesnake
Join Date: Oct 2004
City: Lincoln
State: Nebraska
Posts: 1,900
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I have a 96 cobra 4.6 DOHC engine and i got an error reading P0307 - cylindar 7 misfire, is this an alert that means i should change my plugs and wire or what? any suggestions would be great
Thanks
-Kenny
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11-03-2004, 10:42 PM
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#2
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Senior Tech Advisor
Join Date: Jun 2003
City: Burlington, NC
State: North Carolina
Posts: 2,685
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Check the plug first, then the wire, if neither of those fix the misfire then you might have a mechanical problem like a burnt valve or something.
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 Rick Kilpatrick, AAS Automotive Systems Tech, Alamance Community College, Class of 99. 06 5 speed manual Mustang with Pony pkg : GT Mac Mufflers, true duals with one custom pipe. 2.5" system. GT bumper cover, all installed March 7&8 2006. AFE Stage 1 CAI, Motoblue Underdrive pulley, GT aluminum shifter knob, honeycomb rear blackout panel,and dash kit installed. Roush hood scoop and side window louvers installed. SS taillight trim has been installed, new alum. GT steering wheel installed.
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11-09-2004, 01:24 PM
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#3
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Registered User
Join Date: Jul 2003
Posts: 254
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The computer is very sensitive in that respect, if the crank position sensor or trigger wheel have a problem then it can trigger a false misfire. Does the car run fine? Have you installed UD pulleys on the car? if the balancer is not tightened down enough then it can trigger false misfires.
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Justin Starkey
2007 Shelby GT500 705RWHP/708RWTQ
2000 Mustang 3.8 A4 TT 450RWHP/475RWTQ 10.996@127 17psi stock 3.8
2006 F250 CC 4x4 6.0L 14.3 @ 93
2006 Mustang 4.0 M5 Vortech 13psi 395RWHP/374RWTQ wife's car
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11-09-2004, 02:28 PM
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#4
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Whitesnake
Join Date: Oct 2004
City: Lincoln
State: Nebraska
Posts: 1,900
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it does run fine, no UD pulleys, i cleared it with my diagnostic checker and it hasnt come back so im guessing it wasnt anything. any other ideas they would be great i appreciate it.
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11-12-2004, 10:07 AM
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#5
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Registered User
Join Date: Jul 2003
Posts: 254
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If the car runs fine and it doesn't come back then I would not worry about it.
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Justin Starkey
2007 Shelby GT500 705RWHP/708RWTQ
2000 Mustang 3.8 A4 TT 450RWHP/475RWTQ 10.996@127 17psi stock 3.8
2006 F250 CC 4x4 6.0L 14.3 @ 93
2006 Mustang 4.0 M5 Vortech 13psi 395RWHP/374RWTQ wife's car
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05-14-2006, 04:04 AM
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#6
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Re: Misfire Alert
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Registered User
Join Date: May 2006
City: Nashville
State: Tennessee
Posts: 9
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I pulled one off my #4 cylinder....did the cheapest first and swapped out the plugs and it went away. I have heard folks say that if you get a persistant msifire light it is usually a coil pack. |
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05-14-2006, 11:03 AM
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#7
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Re: Misfire Alert
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WTF^^...
Join Date: May 2003
City: Hoover / Florence
State: Alabama
Posts: 27,126
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i got a missfire when my harmonic balancer scooted out a bit, check the TQ on that bolt (look in manual to find exact spec, its a good bit) its a free thing to check.
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2003 REDFIRE COBRA #3938 of 5082 @ 05/27/2003 1 of 414
MGW Shifter, Stingers, JLT, SS Inserts, MM FLSFC & CC Plates, SS Lines, H&R Race springs, IRS Brace, MRT Hood Struts
ME.com Member #29 - 400rwhp/380rwtq
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05-14-2006, 06:51 PM
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#8
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Re: Misfire Alert
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Registered User
Join Date: May 2006
City: Salem, IN
State: Indiana
Posts: 107
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why pulling post from the dead? |
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