4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

7 cylinders? HELP

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Old 08-05-2006, 05:08 PM
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390mustang
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Default 7 cylinders? HELP

hey guys, i have a 96 GT mustang. Currently Iam running on 7 cylinders, and i have no clue what the problem would be, give me many possiblities so i can try them! Thanks guys
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Old 08-05-2006, 05:40 PM
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Aixtreme89
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Default RE: 7 cylinders? HELP

That a compression tester. You take a spark plug out and crank the motor. Do this to each cylinder and you should have a basline of what the pressure should be. If you have very low in one of them then you have a problem with the psiton rings, or head gasket or vavles. If the pressure is all good, then its your fuel or ignition. You can try fuel injector cleaner, or take them and get the flow tested. As for the ignition check yoru spark plugs or mabye you have to replace a coil pack or something.. Just some things to try. How do you know your only running on 7 cylinders?
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Old 08-05-2006, 06:06 PM
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97 5.0L
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Default RE: 7 cylinders? HELP

Did you recently do anything to the car? any new mods or anything?
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Old 08-05-2006, 06:10 PM
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Triisomy21
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Default RE: 7 cylinders? HELP


ORIGINAL: Aixtreme89

That a compression tester. You take a spark plug out and crank the motor. Do this to each cylinder and you should have a basline of what the pressure should be. If you have very low in one of them then you have a problem with the psiton rings, or head gasket or vavles. If the pressure is all good, then its your fuel or ignition. You can try fuel injector cleaner, or take them and get the flow tested. As for the ignition check yoru spark plugs or mabye you have to replace a coil pack or something.. Just some things to try. How do you know your only running on 7 cylinders?

You're probably one of the dumbest members on here...


No seriously though, it seems like every post I read from you is full of good info. Keep it up man!
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Old 08-05-2006, 06:39 PM
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Fryguy22
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Default RE: 7 cylinders? HELP

ORIGINAL: Triisomy21


ORIGINAL: Aixtreme89

That a compression tester. You take a spark plug out and crank the motor. Do this to each cylinder and you should have a basline of what the pressure should be. If you have very low in one of them then you have a problem with the psiton rings, or head gasket or vavles. If the pressure is all good, then its your fuel or ignition. You can try fuel injector cleaner, or take them and get the flow tested. As for the ignition check yoru spark plugs or mabye you have to replace a coil pack or something.. Just some things to try. How do you know your only running on 7 cylinders?

You're probably one of the dumbest members on here...


No seriously though, it seems like every post I read from you is full of good info. Keep it up man!

yours are full of good info too....




just playing
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Old 08-05-2006, 08:01 PM
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Chopper
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Default RE: 7 cylinders? HELP

Narrow down the search first.Try removing plug wires to figure out which cylinder is missing.When you figure out which cylinder it is use a long screwdriver or wooden dowel to listen to the injector.If the injector sounds different than the other injectors you have probably found the culprit.If this is inconclusive you can move the suspect injector to another cylinder and see if the miss folows.If it does,replace the injector.
You can check the plug in that cylinder and look for damage or fouling.If the plug is fouled by oil you might start looking for the reason why.It could be a bad valve seal (better) or a broken ring tearing up a cylinder wall(worst).
Whatever you do,do it quick.If the plug isn't firing the unburned fuel can cause the oil film to be diluted and washed off the cylinder wall,adding to the cost of the eventual repair.
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Old 08-05-2006, 08:07 PM
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02StanGT
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Default RE: 7 cylinders? HELP

Did it start doing this after a little hard driving, or just normal driving? Could be you threw a cam follower (rocker). Sticking valves could result in the aforementioned problem.
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Old 08-05-2006, 08:49 PM
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Triisomy21
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Default RE: 7 cylinders? HELP


ORIGINAL: Fryguy22

yours are full of good info too....




just playing


ouch[sm=smiley19.gif]
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