GT S197 General DiscussionThis section is for technical discussions pertaining specifically to the V8 variation of the 2005 and newer Ford Mustang.
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I have a moderately Modded 07 GT. (see garage for mods) I am having misfire problems. It started out twice a month, now its once a day at least. It has been all over the board which cylinder but has mostly settled on #3. sometimes it just codes and you dont feel it, more often than not it shuts the cylinder down for 30 seconds or so and you feel it. It does it under all sorts of driving conditions, cruising at 45 with no stopping all the way to hammer down. I have replaced the coil, and plugs. had injectors professionally cleaned, and had tune checked.
Any help is appreciated!
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no, mods have been on for over a year. this started about 8 mos ago. Detroit Rocker Cams, Steeda Underdrive pulley, long tube headers off road H pipes, airraid CAI, 93 tune.
A side note is I have replaced the alt two times in one year and this last time the power wire with the fusable link to the battery was burnt on back of alt. Replaced it. Dont know if it has anything to do with it or not
no just coil pack. well it just sluggish and rough. like i said it shuts down the cylinder to prevent it from getting damaged then clicks back on after about 30sec. ( my mechanic is the one who told me that it was shutting down the cylinder when I described it to him)
Well, it might be the plug wires because a bad wire could cause the connection to be bad causing it to misfire. If it's shutting the cylinder down, it might be because it's not getting the right connection it needs. But it could be something completely different. I thought my engine was bad but it ended up being the catalytic converters were clogged causing it to run very rough.
yea I hadnt even thought that way. i checked new wires are only 100 bucks so i may just toss them on to see what it does. That could be whats causing me to have alt problems if its draining it from a short. Cats are deleted so I know theres no problem there
@ Nuke. Yea they are all oe. I only replaced the one on cylinder three that was having problems. didnt do anything to help. I was only trying to fix the problem. not looking for HP gains....well not there anyway LOL
Since you have Detroit cams, I'd pull the cover and inspect the cam and rockers. You have have scoring on the cam and/or a broken rocker. Or, your tensioner could have failed and not be keeping enough tension, or your chain jumped.
Since you've ensured it is not a plug or cop issue, and since the cams were replaced, the logical choice would be a mechanical issue there, assuming the alternator is producing 14 volts and you have adequate oil pressure.
Mike - 2005 Stroked/Forged/Cammed V8 (5.0L.); twin-turbo build underway
- 2006 4.0 V6 with PH Turbo and TR6060
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