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Old 10-07-2011, 06:47 PM   #1
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Misfire

Hey guys I have a 1996 mustang gt and it's got this misfire that is really gettiing me upset. It misfires more when the car is warm. I just replaced the coils and it was better for a coupple of days but it's back to doing the same thing. Can anyone please help me out if you have any ideas?
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Old 10-07-2011, 06:56 PM   #2
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Re: Misfire

Spark plugs....

---------- Post added at 06:56 PM ---------- Previous post was at 06:50 PM ----------

Have you pulled them make sure gapped right?
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Old 10-07-2011, 06:57 PM   #3
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Spark plugs...try to connect to a scanner to find out which cylinder it is replace the plug..make sure to get the same type,also make sure your wires are seated all the way.
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Old 10-07-2011, 07:10 PM   #4
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They are those e3 plugs so i don't know if you can gap those. & I can hook up a scanner but there's no cel. Will it still show?
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Old 10-07-2011, 07:48 PM   #5
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Fords dont normally show misfire unless its completely dead spark. Thats on the 04 and earlier cars at least. I had a misfire that was the same way. Ended up being a couple valves not sealing. Coils woild be the first thing to check with a problem like that though. Look for stress cracks and burns on the coils. Then check the wires as well. Looks for burns or places that the wires look white instead of their normal color. This would show that they are arching. Lastly check the injectors. Sometimes when they heat up the solenoid wont open completely to inject fuel. They need to be flow tested to really tell though
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Old 10-07-2011, 09:11 PM   #6
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Plugs look good & wires did look white & black on some spots (their red). I just replaced the coils this week.
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Old 10-07-2011, 10:08 PM   #7
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Wires need replaced if you can see burns like that. They are arching
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Old 10-07-2011, 10:28 PM   #8
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I didn't see any sparks when I checked the other night but they are definitely black in some spots. They're msd wires I'm suprised they only lasted a year. I'll check for sparks again though.
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Old 10-08-2011, 07:50 AM   #9
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With wires you really want to make sure they dont lay on eachother or anything metal like valve covers ect. They will prematurely fail and arch out. Many times you dont see the arching because its a weak arch but it draws alot from the spark plug. This is why stock vehicles come with so mant of those crappy little clips to hold wires up and apart from eachother. Make sure they are seperated and not laying on metal
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Old 10-08-2011, 10:06 AM   #10
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Okay I will. Thank you
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Old 10-08-2011, 12:04 PM   #11
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Oh yea and sometimes when I pull from it the rpm's get stuck at like 2k when I take my foot off the gas. Any ideas?
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Old 10-08-2011, 03:04 PM   #12
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Mine did the same thing when my valves wouldnt close completely. What happene in my case was carbon was blown off when i went supercharged and the valve wouldnt seal
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Old 10-08-2011, 08:39 PM   #13
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Clean the throttle body and the iac (idle air control) I had a misfire and not really trying to fix that I just cleaned the tb and the iac and never had the problem again.
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Old 10-08-2011, 09:22 PM   #14
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It fixed. Finally!! I took out the spark plugs to inspect them & some were loose. It's running great now.
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Old 10-13-2011, 11:23 PM   #15
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It's back:/. It only does it when it's under a big load & it's very minor. Does anyone have any ideas?
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