Misfire question....

97snakercin · July 13th, 2006, 04:29 PM

Ok question for all you cobra geniusses out of there.... alot of the time when i get into the throttle hard....when i go to shift i hear this popping noise from my exhaust as the rpms drop its pretty loud too like miniature backfires......while it's Idling i can hear this soft "pmmf" sound comming from the exhause every few seconds...... am I running rich or lean?, maybe need to change plug wires? timing? hell i dunno....but it irritates me and i wanna fix it.....any help would be great!!!

By the way once it gets good and warmed up it doesnt do it nearly as bad

Drgnracin72 · July 13th, 2006, 10:48 PM

IM NOT A COBRA GENNIUS

Invictus · July 14th, 2006, 01:03 AM

i'm not a cobra genuis either but I have a 4.6L GT and mine does the same thing. I have a full dual 3.5" SLP loudmouth exhaust system and you can hear everything that comes out.. I think it's normal actually .. i've always noticed it but never thought much of it.

99mustang232 · July 14th, 2006, 02:47 PM

have you pulled any spark plugs to look at them yet?

Casper98GT · July 14th, 2006, 04:29 PM

sn-95 cobra coil packs are junk. replace them. with screaming demon kit, or MSD.

97snakercin · July 14th, 2006, 10:25 PM

Actually I have recently changed all of my spark plugs....however I used bosch plat +4's and i'm wondering if maybe they are also junk......

any thoughts? oh and yeah im running stock wires/ coil packs w/ 119700 miles on my snake

Drgnracin72 · July 14th, 2006, 10:27 PM

platnum is shit just go with simple ngk or autolites

Casper98GT · July 15th, 2006, 10:28 AM

Actually I have recently changed all of my spark plugs....however I used bosch plat +4's and i'm wondering if maybe they are also junk......

any thoughts? oh and yeah im running stock wires/ coil packs w/ 119700 miles on my snake

If you want i can give you the email address to my buddy and his 1998 Cobra that the BOSCH 4's that he put in....... piece of the plug broke off and now he doesnt have the car anymore. They are a real shitty plug. Stick to Motorcraft plugs. Or switch to a Denso/NGK plug. Single tip and you will be fine.

So my suggestions..... Replace plugs with what we have suggested. Replace the wires and coil packs. Also if you havent already run a bottle of "seafoam" through youre pcv system. Clean that snake right out.

http://www.performancedistributors.com/4.6ignition.htm

thats what i suggest... i run them and i gained .2 in the 1/4.

97snakercin · July 15th, 2006, 03:47 PM

I will and yeah i have run 2 bottles of seafoam through my car...... dont think it had ever been done until 119k miles..... had just as much smoke billow out the last time as i did the first time so im thinkin i prolly need to do it a couple more times..... unless it will hurt it to keep doin that. I want to just tear into it and clean my imrc's while i get my heads ported but then again i have no experience tearing into this engine and i dont wanna screw anything up....plus i live in harrison arkansas where there is no where to get anything done plus i work 80+ hrs a week so time is an issue aswell

P.S. Never become an army recruiter..........I did and it sucks.....dont get me wrong the army is great but recruiting BLOWS....

Casper98GT · July 15th, 2006, 04:05 PM

yeah, you guys are friggen annoying as hell. Just leave me alone.... if i wanted to join up i would join.

97snakercin · July 15th, 2006, 05:39 PM

Join up??? What are you talking about?

Casper98GT · July 15th, 2006, 07:04 PM

Recruiters.... they make me mad.

Drgnracin72 · July 15th, 2006, 07:26 PM

they do get a little annoying sometimes. doesnt matter how many times you say no they still keep buggin ya to do it!

Casper98GT · July 15th, 2006, 07:32 PM

100% truth.

99mustang232 · July 15th, 2006, 10:11 PM

Originally Posted by 97snakercin

....however I used bosch plat +4's and i'm wondering if maybe they are also junk......

i would suspect this is the culprit, would change over to autolites asap! a friend of mine put a set of bosch's on his girlfriends v6, next thing you know misfire and then started throwing codes. changed the plugs and all was fixed!

97snakercin · July 17th, 2006, 11:22 PM

I'm not asking anyone to join...... I apologize but I didnt pick this job i was thrown into it.....and i hate it...... I think if people are gonna join then they'll join if not then we shouldnt be hounding em about it....... besides i dont mix my car w/ my job

Black99GT53 · July 18th, 2006, 09:54 AM

yeah i had a misfire prob for a while actually turned out to be my coil boots allowing moisture to get in which in turn caused corrosion and a bad connection, and i would also change to the NGK plugs, ive had no issues with mine since i put em in.

Casper98GT · July 18th, 2006, 07:08 PM

1999 GT and 1997 Cobra = 2 different ignition systems. But yes alot of times the coils on the COP system had water in the boots and corrode.

Mystry · August 2nd, 2006, 06:18 PM

i just fixed the same problem on my 96 GT and i did it with Autolite iridium plugs and wires, although i havent heard such great things about the iridium ones...but it fixed my car right up

July 13th, 2006, 04:29 PM	#1
97snakercin Newbie Join Date: Jun 2006 Location: Harrison Arkansas Posts: 47 iTrader: 0 reviews	Misfire question.... Ok question for all you cobra geniusses out of there.... alot of the time when i get into the throttle hard....when i go to shift i hear this popping noise from my exhaust as the rpms drop its pretty loud too like miniature backfires......while it's Idling i can hear this soft "pmmf" sound comming from the exhause every few seconds...... am I running rich or lean?, maybe need to change plug wires? timing? hell i dunno....but it irritates me and i wanna fix it.....any help would be great!!! By the way once it gets good and warmed up it doesnt do it nearly as bad __________________ The Impossible is really only unatainable in your mind.

July 13th, 2006, 10:48 PM	#2
Drgnracin72 I Post Entirely Way Too Much Join Date: Jan 2006 Location: somewhere in oklahoma Posts: 10,635 iTrader: 2 reviews	IM NOT A COBRA GENNIUS __________________ RIP ΜΟΛΩΝ ΛΑΒΕ Political Correctness is a doctrine, fostered by a delusional, illogical, liberal minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end. One Big Ass Mistake America SHEEPDOGS

July 14th, 2006, 02:47 PM	#4
99mustang232 MM Fanatic 1999 Ford Mustang V6 Join Date: Sep 2005 Location: newport news, va Posts: 3,745 iTrader: 0 reviews	have you pulled any spark plugs to look at them yet? __________________ ...even fire and single cammin 1986 Ford F-150 5.0L 2WD 1994 Toyota Pickup 2.4L 4WD 1999 Ford Mustang 3.8L V6 2002 Jeep Grand Cherokee 4.0L 2WD 2008 GMC Sierra Denali 6.2L AWD

July 14th, 2006, 04:29 PM	#5
Casper98GT Hardcore Enthusiast Join Date: Aug 2005 Location: NEW HAMPSHIRE Posts: 2,393 iTrader: 0 reviews	sn-95 cobra coil packs are junk. replace them. with screaming demon kit, or MSD. __________________ 91 LX, 5spd. Ex:Toyota/Ford tech Marine Machinery Technician, Department of Defense.

July 14th, 2006, 10:25 PM	#6
97snakercin Newbie Join Date: Jun 2006 Location: Harrison Arkansas Posts: 47 iTrader: 0 reviews	Actually I have recently changed all of my spark plugs....however I used bosch plat +4's and i'm wondering if maybe they are also junk...... any thoughts? oh and yeah im running stock wires/ coil packs w/ 119700 miles on my snake __________________ The Impossible is really only unatainable in your mind.

July 14th, 2006, 01:03 AM	#3
Invictus Hardcore Enthusiast 1999 Mustang Join Date: Jul 2006 Posts: 1,354 iTrader: 0 reviews	i'm not a cobra genuis either but I have a 4.6L GT and mine does the same thing. I have a full dual 3.5" SLP loudmouth exhaust system and you can hear everything that comes out.. I think it's normal actually .. i've always noticed it but never thought much of it.

July 14th, 2006, 10:27 PM	#7
Drgnracin72 I Post Entirely Way Too Much Join Date: Jan 2006 Location: somewhere in oklahoma Posts: 10,635 iTrader: 2 reviews	platnum is shit just go with simple ngk or autolites __________________ RIP ΜΟΛΩΝ ΛΑΒΕ Political Correctness is a doctrine, fostered by a delusional, illogical, liberal minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end. One Big Ass Mistake America SHEEPDOGS

July 15th, 2006, 03:47 PM	#9
97snakercin Newbie Join Date: Jun 2006 Location: Harrison Arkansas Posts: 47 iTrader: 0 reviews	I will and yeah i have run 2 bottles of seafoam through my car...... dont think it had ever been done until 119k miles..... had just as much smoke billow out the last time as i did the first time so im thinkin i prolly need to do it a couple more times..... unless it will hurt it to keep doin that. I want to just tear into it and clean my imrc's while i get my heads ported but then again i have no experience tearing into this engine and i dont wanna screw anything up....plus i live in harrison arkansas where there is no where to get anything done plus i work 80+ hrs a week so time is an issue aswell P.S. Never become an army recruiter..........I did and it sucks.....dont get me wrong the army is great but recruiting BLOWS.... __________________ The Impossible is really only unatainable in your mind.

July 15th, 2006, 04:05 PM	#10
Casper98GT Hardcore Enthusiast Join Date: Aug 2005 Location: NEW HAMPSHIRE Posts: 2,393 iTrader: 0 reviews	yeah, you guys are friggen annoying as hell. Just leave me alone.... if i wanted to join up i would join. __________________ 91 LX, 5spd. Ex:Toyota/Ford tech Marine Machinery Technician, Department of Defense.

July 15th, 2006, 05:39 PM	#11
97snakercin Newbie Join Date: Jun 2006 Location: Harrison Arkansas Posts: 47 iTrader: 0 reviews	Join up??? What are you talking about? __________________ The Impossible is really only unatainable in your mind.

July 15th, 2006, 07:04 PM	#12
Casper98GT Hardcore Enthusiast Join Date: Aug 2005 Location: NEW HAMPSHIRE Posts: 2,393 iTrader: 0 reviews	Recruiters.... they make me mad. __________________ 91 LX, 5spd. Ex:Toyota/Ford tech Marine Machinery Technician, Department of Defense.

July 15th, 2006, 07:26 PM	#13
Drgnracin72 I Post Entirely Way Too Much Join Date: Jan 2006 Location: somewhere in oklahoma Posts: 10,635 iTrader: 2 reviews	they do get a little annoying sometimes. doesnt matter how many times you say no they still keep buggin ya to do it! __________________ RIP ΜΟΛΩΝ ΛΑΒΕ Political Correctness is a doctrine, fostered by a delusional, illogical, liberal minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end. One Big Ass Mistake America SHEEPDOGS

July 15th, 2006, 07:32 PM	#14
Casper98GT Hardcore Enthusiast Join Date: Aug 2005 Location: NEW HAMPSHIRE Posts: 2,393 iTrader: 0 reviews	100% truth. __________________ 91 LX, 5spd. Ex:Toyota/Ford tech Marine Machinery Technician, Department of Defense.

July 17th, 2006, 11:22 PM	#16
97snakercin Newbie Join Date: Jun 2006 Location: Harrison Arkansas Posts: 47 iTrader: 0 reviews	I'm not asking anyone to join...... I apologize but I didnt pick this job i was thrown into it.....and i hate it...... I think if people are gonna join then they'll join if not then we shouldnt be hounding em about it....... besides i dont mix my car w/ my job __________________ The Impossible is really only unatainable in your mind.

July 18th, 2006, 09:54 AM	#17
Black99GT53 Newbie Join Date: Jul 2006 Posts: 6 iTrader: 0 reviews	yeah i had a misfire prob for a while actually turned out to be my coil boots allowing moisture to get in which in turn caused corrosion and a bad connection, and i would also change to the NGK plugs, ive had no issues with mine since i put em in.

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July 18th, 2006, 07:08 PM	#18
Casper98GT Hardcore Enthusiast Join Date: Aug 2005 Location: NEW HAMPSHIRE Posts: 2,393 iTrader: 0 reviews	1999 GT and 1997 Cobra = 2 different ignition systems. But yes alot of times the coils on the COP system had water in the boots and corrode. __________________ 91 LX, 5spd. Ex:Toyota/Ford tech Marine Machinery Technician, Department of Defense.

August 2nd, 2006, 06:18 PM	#19
Mystry Enthusiast 03 Mustang GT Join Date: Apr 2006 Location: Washington, Illinios Posts: 708 iTrader: 0 reviews	i just fixed the same problem on my 96 GT and i did it with Autolite iridium plugs and wires, although i havent heard such great things about the iridium ones...but it fixed my car right up __________________

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