• Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang Tech

Car

  • Thread starter Thread starter 88-GT
  • Start date Start date Dec 28, 2004

88-GT

Member
Oct 8, 2004
183
2
18
Dec 28, 2004
#1
  • Dec 28, 2004
  • #1
Car Misfiring

Hey guys,

Well today I went out and started the beast and once it was started I could hear the engine misfiring. The car ran fine a week ago but now it runs pretty ruff. Its only on the passenger side bank of the engine(I dont have an H or X) and only messes with the one side of the engine. It sounds off all the time. When it happens it sounds like a huge rush of air shoots out the exhaust. Ive ruled out plug wires as it ran fine before and they are new. Ive also changed o2 sensors. I just pulled the plugs and 1 2 3 are wet and gassy and 4 is carbony. Any help is appreciated. Thnx.
 
8

89_Nach

New Member
Sep 5, 2004
16
0
0
Grahan. NC
Dec 28, 2004
#2
  • Dec 28, 2004
  • #2
Have you checked to see if you have a header/manifold leak?
 

88-GT

Member
Oct 8, 2004
183
2
18
Dec 28, 2004
#3
  • Dec 28, 2004
  • #3
Definately dont have a header leak, been checking that but as for the manifold( im assumming your talking about intake there isnt a noticable leak, althought I wouldnt know how to go about checking.
 

88-GT

Member
Oct 8, 2004
183
2
18
Dec 29, 2004
#4
  • Dec 29, 2004
  • #4
bump
 

zkillrr

Member
Dec 22, 2004
97
0
16
Memphis.Tn
Dec 29, 2004
#5
  • Dec 29, 2004
  • #5
88-GT said:
bump
Click to expand...
I would not rule out plugs wires or cap, even though they are new a wire could be broken on the inside and you can't see it. on the side that you said
you was have problems start taking one wire off at a time then start it. if
nothing change car runs the same you will no that that is the bad wire if it gets worse that wire is working, to save money sometimes the simple things give you all the problems in the world an you will buy all the wrong things to fix it. I can also be wrong, but it can't hurt nothing because it's already
runing bad and this want cost anything but time!
 

HISSIN50

"How long does it take to get help in here?
15 Year Member
Nov 29, 1999
31,179
34
129
Dec 29, 2004
#6
  • Dec 29, 2004
  • #6
zkillrr said:
I would not rule out plugs wires or cap, even though they are new a wire could be broken on the inside and you can't see it. on the side that you said
you was have problems start taking one wire off at a time then start it. if
nothing change car runs the same you will no that that is the bad wire if it gets worse that wire is working...
Click to expand...
this test was my first thought too. i would add that if you pull a plug wire and nothing changes (suggesting you have found a bad cylinder, for one reason or another), it can be several things. amongst them are the wire, plug injector or injector harness to that plug. if you find a bad cylinder and can rule out the ignition (wire, plug, etc), i would use a noid light or do a cylinder balance test (balance test checks the injectors).
go from there (post results if stumped). good luck.
 
You must log in or register to reply here.

Similar threads

P
Fuel New Eldebrock 1406 problems 1985 GT 5.0
  • Paddyman
  • Oct 22, 2026
  • Fox 5.0 Mustang Tech
Replies
4
Views
161
Fox 5.0 Mustang Tech Nov 2, 2026
manicmechanic007
K
Resolved Weird sound coming from a freshly rebuilt 5.0L
  • karhoot
  • Jun 24, 2026
  • Fox 5.0 Mustang Tech
Replies
7
Views
362
Fox 5.0 Mustang Tech Jun 27, 2026
Mac131
M
Help! 2003 GT misfire when hot
  • Modular03
  • Feb 10, 2026
  • SN95 4.6L Mustang Tech
Replies
4
Views
602
SN95 4.6L Mustang Tech Feb 13, 2026
Mustang5L5
G
Resolved Smoking Wiring Issue After GT40 Head Swap
  • Grapes
  • Aug 15, 2026
  • Fox 5.0 Mustang Tech
Replies
17
Views
550
Fox 5.0 Mustang Tech Aug 22, 2026
Grapes
G
Engine Random Misfire at idle.
  • Gulftown980x
  • Jul 29, 2026
  • SN95 4.6L Mustang Tech
Replies
11
Views
574
SN95 4.6L Mustang Tech Jul 31, 2026
squeak93
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 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?