Number 5 misfire please help - Mustang Evolution

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Old 12-06-2012, 04:04 AM   #1
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Exclamation Number 5 misfire please help

OMG i bought this car in May it is sweet looking, only has 68K miles. I have had a number 5 cylinder misfire and 3 shops later no one has figured it out.

We check compression- its fine
Changed plugs, wires and coil packs
Changed the cam sensor, crank sensor, fuel flow sensor
Changed the number 5 injector
Checked all the connections to the injectors

Have done all the normal routine maintanence, Im anal about that

CAR IS STILL NOT FIXED

Again i have the number 5 misfire, the pluged is fouled out and We need help getting this car fixed. I have dumped thousands into this car and no one can figure out, big valley ford couldnt figure it out and sent me on my way telling me its just a fluke


PLEASE I NEED SOME HELP ON WHAT TO DO NEXT. IM SO TIRED OF TRYING TO FIGURE THIS OUT
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Old 12-06-2012, 04:32 AM   #2
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Check out Ford TSB 96-17-9... Might help
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Old 12-06-2012, 04:49 AM   #3
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Thank you I will keep you posted
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Old 12-06-2012, 11:12 AM   #4
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If that doesn't fix it take a noid light to the injector harness and see if its on when the key comes on. If its steady then replace the PCM.
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Old 12-08-2012, 12:45 AM   #5
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Possible burnt valve too can cause this imo
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1996 Mustang GT, 17x9 front and 17x10.5 cobra r replica rims, 255/40/17 front 285/40/17 rear at the moment,
o/r x-pipe flow master 40 series dump downs, cai/ram intake, 75mm c&l throttle body and plenum, pi heads and intake swap, msd wires, stock gears, untuned at the moment, no dyno numbers for now.
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Old 12-08-2012, 10:52 AM   #6
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Burnt valve would show low compression.
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Old 12-08-2012, 06:09 PM   #7
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Quote:
Originally Posted by 2000steeda029 View Post
Burnt valve would show low compression.
We don't know what the readings are
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Old 12-08-2012, 09:12 PM   #8
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Quote:
Originally Posted by Gera8712 View Post
We don't know what the readings are
true if we had readings then we could atleast somewhat diagnose the problem
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Old 12-08-2012, 11:29 PM   #9
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But was stated compression checked fine
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Old 12-09-2012, 12:42 AM   #10
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But some engines might be close to the 25% range between eachother and still fail(have bad rings,head gaskets,valves,etc)
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Old 12-09-2012, 01:01 AM   #11
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Originally Posted by 2000steeda029 View Post
But was stated compression checked fine
Depends on what fine is considerrd imo 125 to 140 psi per cylinder would be acceptable for compression on these motors. They couldve said 90 is good which i would not agree with
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o/r x-pipe flow master 40 series dump downs, cai/ram intake, 75mm c&l throttle body and plenum, pi heads and intake swap, msd wires, stock gears, untuned at the moment, no dyno numbers for now.
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Old 12-09-2012, 04:51 AM   #12
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Couldn't this problem be contributed by a leaking head gasket between # 5 & 6 cylinders? Just asking. When I pulled my stock heads I noticed some sharing between cylinders, but after 15 yrs of use I wasn't surprised.
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Old 12-09-2012, 10:12 AM   #13
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True I wouldn't accept 90 paid

---------- Post added at 12:12 PM ---------- Previous post was at 12:11 PM ----------

True I wouldn't accept 90 psi
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