• Mustang Forums
  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech

Coil on plug problem Need advice

  • Thread starter Thread starter Jkstang78
  • Start date Start date Jun 12, 2009

Jkstang78

Founding Member
Oct 14, 2002
1,510
1
38
long island N.Y.
Jun 12, 2009
#1
  • Jun 12, 2009
  • #1
My G/f has a 2003 mustang gt. One of her coil on plugs caught on fire. I have not been able to go to her house, Since I work nights and she work days.

But from what she tells me is the the Coil on plug caught fire and melted the connector. She got a new connector and and put it on. But now the problem is that when she turns the ignition on, the coil pack get's hot. When she started the car it cracked the new coil plug pack also.

So has anyone else had a problem like this. Or know what might be the problem.

Thanks Jason
 

flstang65

10 Year Member
Dec 6, 2007
1,484
135
94
SE Georgia
Jun 13, 2009
#2
  • Jun 13, 2009
  • #2
Um, this might be a dumb question but, did you change the coil pack that caught on fire?
 

LaserSVT

Got FB banned again for saying nards
Founding Member
Nov 29, 1999
9,389
3,536
233
Jun 13, 2009
#3
  • Jun 13, 2009
  • #3
Did you check the spark plug? If the coil is heating up (ill assume its a new coil) then its more then likely the tip of the plug is touching the tipand grounding out.
 

Jkstang78

Founding Member
Oct 14, 2002
1,510
1
38
long island N.Y.
Jun 14, 2009
#4
  • Jun 14, 2009
  • #4
Sorry about that she did change the coil to a different on. I don't know if she had check the spark plug on it. she had a set of aftermarket ones. I want to say accel ones not 100% sure on the brand but as soon as she put it on and turn the car on it would crack the bottom of the coil instantly. o it sem like there is a short somewhere.

On the harness does anyone know if there is a fuseable link that might have gone.
 

LaserSVT

Got FB banned again for saying nards
Founding Member
Nov 29, 1999
9,389
3,536
233
Jun 14, 2009
#5
  • Jun 14, 2009
  • #5
Change the sparkplug then re test.
 
M

meshow99

New Member
Apr 19, 2004
20
0
0
NH
Aug 19, 2010
#6
  • Aug 19, 2010
  • #6
Can anyone tell me what happened? I have the same problem.
 

95Vert383AOD

15 Year Member
Jun 10, 2008
1,133
34
69
New Bedford, MA
Aug 20, 2010
#7
  • Aug 20, 2010
  • #7
Does polarity matter when swapping plugs? Just a thought
 

wmburns

SN Certified Technician
Aug 14, 2009
5,892
514
204
Houston Texas
Aug 20, 2010
#8
  • Aug 20, 2010
  • #8
Excessive dwell COP engine fire

Please review the following post. Esp # 6. It is an exact match for your problem.

http://www.stangnet.com/mustang-for...l-rpms-stay-high-after-letting-off-pedal.html

Do not continue to drive this car. Please see below for someone that ignored this advice. There is a great write-up with the aftermath of the engine fire.

2v gt 2000 . 1 coil keeps blowin help!??
 

brian powers

New Member
Dec 4, 2013
1
0
2
Savannah, Georgia
Dec 4, 2013
#9
  • Dec 4, 2013
  • #9
i'm currently working on a 2000 mustang gt and it started skipping. i changed the plugs, no help. engine code says number one misfire. changed coil, worked fine. for about 30 miles, then the thing caught on fire. i replaced the coil again, same problem, caught on fire. turns out the fuel rail right over the coil has a bracket that is spot welded in place. two welds broke allowing the bracket to hit the top of the coil and cracking it, causing an internal short resulting in the fire. this is only possible on number one and eight(the other two brackets have plenty of clearance). the way to test is to install coil and make sure you have about 20 thousandths clearance between coil and fuel rail(those of you without feeler gauges can use the equivalent of the thickness of a match book cover). i actually seen the difference with my own eyes, but the clincher was seeing the top of the coil was cracked. hope this helps because i have changed almost 100 of those things in the past 10 years and i have never seen this happen before. i bet you i'll never forget it, i also made a note in the service manual, good luck.
 
You must log in or register to reply here.

Similar threads

K
Engine 2000 Mustang GT - Fuel issue post-blown spark plug repair
  • kenster1092
  • Feb 26, 2026
  • SN95 4.6L Mustang Tech
Replies
4
Views
287
SN95 4.6L Mustang Tech Mar 10, 2026
kenster1092
K
8
Electrical Crank-no start ... no spark ... no injector pulse, was it something I did? (redux)
  • 85gtCOBRA
  • Oct 28, 2025
  • Fox 5.0 Mustang Tech
Replies
2
Views
493
Fox 5.0 Mustang Tech Oct 29, 2025
85gtCOBRA
8
Z
2003 Mustang GT melting coils
  • zacharyblain2003gt
  • Jun 1, 2024
  • SN95 4.6L Mustang Tech
Replies
0
Views
397
SN95 4.6L Mustang Tech Jun 1, 2024
zacharyblain2003gt
Z
A
2001 Mustang GT, scorched metal smell and noise from trans/diff?
  • AndyE2255
  • Dec 1, 2025
  • SN95 4.6L Mustang Tech
Replies
4
Views
411
SN95 4.6L Mustang Tech Dec 28, 2025
gkomo
Chevy Equinox- Devil in Disguise?
  • RaggedGT
  • Apr 19, 2025
  • Other Auto Tech
Replies
18
Views
582
Other Auto Tech Jul 31, 2025
RaggedGT
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?