Real bad miss miss miss miss etc

98REDGT · November 27th, 2011, 03:59 PM

98 GT Auto. Under heavy acceleration it constantly and quickly misses like crazy. Under normal driving conditions or WOT its just fine. Maybe a little miss at WOT, but real real real bad under other heavy throttle. Perfect at normail driving. Normal driving i keep rpms under 2200, most time at or under 2000. Plugs are motorcraft coppers with maybe 3k on them. I think engine is stock except PO put on a WAI with cone filter under hood, not infender. I have a perm installed fuel pressure guage. Car starts perfect, idles perfect, cruises perfect, gets 22mpg plus with 75%HWY. Could the intake cause this?
No vac leaks either, no codes. Has motorcraft wires.They "look"good, no sparks from them in the dark. Dont know age or maybe originals,CAr has 132k on it.
Suggestion?

sharkbait · November 27th, 2011, 04:03 PM

check for water in the spark plug holes...check them all

98REDGT · November 27th, 2011, 04:06 PM

Actually did that yesterday when i pulled plugs to check what they looked like, since they only have a couple thousand on them. The last 4 wks car has been DD with about 60miles a day with 40 or so being all hwy cruise at 60-65.

sharkbait · November 27th, 2011, 10:12 PM

Maybe you have a bad coil pack?

You said its fine at WOT but it misses at heavy part throttle?

1996 GT · November 27th, 2011, 10:34 PM

Coil pack might be heating up to much at WOT?

Just an idea.

98REDGT · November 27th, 2011, 10:50 PM

Yes. It misses bad under heavy throttle like half to almost wot. Will go away if I floor it. Or its fine at normal driving.

Blower Head · November 28th, 2011, 09:02 AM

If you can get the codes read by a scan tool that can check pending codes that might give you an idea what cylinder or cylinders are involved. Pending codes will show up without turning on the cel.

Dannyboymanus · November 28th, 2011, 04:10 PM

Mine did that and didn't throw any codes it turned out to be plug wires. I just replaced stock ignition with ngk coils and wires and it went away.

98REDGT · November 28th, 2011, 06:26 PM

There are no codes or pending codes stored. Think ill change the wires. Has motorcraft on it, but no idea how old they are. They look good and clean. But no idea on age. Maybe just wore out? Looks like one of the coil packs is a parts store. One has motorcraft on it, one doesn't.

Dannyboymanus · November 28th, 2011, 09:45 PM

It's more then likely the wires. Mine was doing it when I went over half throttle or on a fast take off. I changed plugs and still did it so just ordered wires and coil packs and it stopped

98REDGT · November 29th, 2011, 06:40 PM

Going to pick up a set of good wires. What do you guys recommend. Anythuing better than the motorcraft? Saw some like 8.8MM wires on ebay. Suggestions?
Probably be a little bit before i do it. We are getting snow now. Besides not having a garage to do it in, its no longer DD till spring.

1996 GT · November 29th, 2011, 07:20 PM

I've heard good things about Taylor, but i'm personally ordering myself a set of oem motorcraft wires this week.

November 27th, 2011, 03:59 PM	#1
98REDGT Regular Join Date: Dec 2010 Posts: 275 iTrader: 0 reviews	Real bad miss miss miss miss etc 98 GT Auto. Under heavy acceleration it constantly and quickly misses like crazy. Under normal driving conditions or WOT its just fine. Maybe a little miss at WOT, but real real real bad under other heavy throttle. Perfect at normail driving. Normal driving i keep rpms under 2200, most time at or under 2000. Plugs are motorcraft coppers with maybe 3k on them. I think engine is stock except PO put on a WAI with cone filter under hood, not infender. I have a perm installed fuel pressure guage. Car starts perfect, idles perfect, cruises perfect, gets 22mpg plus with 75%HWY. Could the intake cause this? No vac leaks either, no codes. Has motorcraft wires.They "look"good, no sparks from them in the dark. Dont know age or maybe originals,CAr has 132k on it. Suggestion? __________________ 1998 GT. Headers with catless X-pipe into flowmasters. CAI. Cobra wheels 17x9 with 245/40's and 17x10.5 with 275/40's. 04 GT leather interior.

November 27th, 2011, 04:03 PM	#2
sharkbait Hooo Ha Ha 1997 Mustang GT 11.65 @ 115 Join Date: Apr 2009 Location: Pasadena MD Posts: 9,743 iTrader: 10 reviews	check for water in the spark plug holes...check them all __________________ 410rwhp 520rwtq @ 12.9 psi

November 27th, 2011, 04:06 PM	#3
98REDGT Regular Join Date: Dec 2010 Posts: 275 iTrader: 0 reviews	Actually did that yesterday when i pulled plugs to check what they looked like, since they only have a couple thousand on them. The last 4 wks car has been DD with about 60miles a day with 40 or so being all hwy cruise at 60-65. __________________ 1998 GT. Headers with catless X-pipe into flowmasters. CAI. Cobra wheels 17x9 with 245/40's and 17x10.5 with 275/40's. 04 GT leather interior.

November 27th, 2011, 10:12 PM	#4
sharkbait Hooo Ha Ha 1997 Mustang GT 11.65 @ 115 Join Date: Apr 2009 Location: Pasadena MD Posts: 9,743 iTrader: 10 reviews	Maybe you have a bad coil pack? You said its fine at WOT but it misses at heavy part throttle? __________________ 410rwhp 520rwtq @ 12.9 psi

November 27th, 2011, 10:50 PM	#6
98REDGT Regular Join Date: Dec 2010 Posts: 275 iTrader: 0 reviews	Yes. It misses bad under heavy throttle like half to almost wot. Will go away if I floor it. Or its fine at normal driving. __________________ 1998 GT. Headers with catless X-pipe into flowmasters. CAI. Cobra wheels 17x9 with 245/40's and 17x10.5 with 275/40's. 04 GT leather interior.

November 27th, 2011, 10:34 PM	#5
1996 GT Traction...? 1996 GT/ 2008 GT Vert Join Date: Nov 2010 Location: Canada Posts: 2,207 iTrader: 0 reviews	Coil pack might be heating up to much at WOT? Just an idea.

November 28th, 2011, 09:02 AM	#7
Blower Head Regular 1996 Mustang GT Vert Join Date: Oct 2007 Location: blaine, MN Posts: 270 iTrader: 1 reviews	If you can get the codes read by a scan tool that can check pending codes that might give you an idea what cylinder or cylinders are involved. Pending codes will show up without turning on the cel. __________________ 96 GT vert, Aftercooled Vortech, Lightning MAF,42# injectors, saleen cams, Bullitt intake, tune by Hitech, Magnaflow catback and O/R xpipe, Cobra brake upgrade, lowered bilstein suspension w/MM c/c plates and subframe connectors 3000 stall and 3.73's

November 28th, 2011, 04:10 PM	#8
Dannyboymanus Newbie 98 mustang gt 4.6 Join Date: Nov 2011 Location: Olive branch,ms Posts: 4 iTrader: 0 reviews	Mine did that and didn't throw any codes it turned out to be plug wires. I just replaced stock ignition with ngk coils and wires and it went away.

November 28th, 2011, 06:26 PM	#9
98REDGT Regular Join Date: Dec 2010 Posts: 275 iTrader: 0 reviews	There are no codes or pending codes stored. Think ill change the wires. Has motorcraft on it, but no idea how old they are. They look good and clean. But no idea on age. Maybe just wore out? Looks like one of the coil packs is a parts store. One has motorcraft on it, one doesn't. __________________ 1998 GT. Headers with catless X-pipe into flowmasters. CAI. Cobra wheels 17x9 with 245/40's and 17x10.5 with 275/40's. 04 GT leather interior.

November 28th, 2011, 09:45 PM	#10
Dannyboymanus Newbie 98 mustang gt 4.6 Join Date: Nov 2011 Location: Olive branch,ms Posts: 4 iTrader: 0 reviews	It's more then likely the wires. Mine was doing it when I went over half throttle or on a fast take off. I changed plugs and still did it so just ordered wires and coil packs and it stopped

November 29th, 2011, 06:40 PM	#11
98REDGT Regular Join Date: Dec 2010 Posts: 275 iTrader: 0 reviews	Going to pick up a set of good wires. What do you guys recommend. Anythuing better than the motorcraft? Saw some like 8.8MM wires on ebay. Suggestions? Probably be a little bit before i do it. We are getting snow now. Besides not having a garage to do it in, its no longer DD till spring. __________________ 1998 GT. Headers with catless X-pipe into flowmasters. CAI. Cobra wheels 17x9 with 245/40's and 17x10.5 with 275/40's. 04 GT leather interior.

November 29th, 2011, 07:20 PM	#12
1996 GT Traction...? 1996 GT/ 2008 GT Vert Join Date: Nov 2010 Location: Canada Posts: 2,207 iTrader: 0 reviews	I've heard good things about Taylor, but i'm personally ordering myself a set of oem motorcraft wires this week.

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