4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

Miss fire #5 cylinder, what could it be?

Thread Tools
 
Search this Thread
 
Old 04-12-2008, 07:55 PM
  #1  
LynnBob Mustang
5th Gear Member
Thread Starter
 
LynnBob Mustang's Avatar
 
Join Date: Aug 2007
Location: PA
Posts: 2,243
Default Miss fire #5 cylinder, what could it be?

We took the stang ('99 GT) for a cruise tonight and it started to run a little rough and the CEL came on.
Went to Autozone to have it checked and they said it came up Miss fire #5 cylinder.

What could it be, a coil pack, spark plug, anything else???

Lynn
LynnBob Mustang is offline  
Old 04-12-2008, 08:14 PM
  #2  
96GT226410
CSMG Moderator
 
96GT226410's Avatar
 
Join Date: Mar 2006
Location: New Jersey
Posts: 3,503
Default RE: Miss fire #5 cylinder, what could it be?

Could be a bunch of things. For starters, take the coil from cyliner 5 and switch it with a different cylinder. See if the misfire goes to that cylinder. This way you know it's a bad coil. If not, then switch a plug. If not, then switch an injector. All of those shouldn't take long at all.
96GT226410 is offline  
Old 04-12-2008, 08:15 PM
  #3  
doughboy4.6
3rd Gear Member
 
doughboy4.6's Avatar
 
Join Date: Apr 2006
Location:
Posts: 812
Default RE: Miss fire #5 cylinder, what could it be?

you are right coil or spark plug. If it is not that you may want to do a compresson test
doughboy4.6 is offline  
Old 04-12-2008, 08:19 PM
  #4  
96GT226410
CSMG Moderator
 
96GT226410's Avatar
 
Join Date: Mar 2006
Location: New Jersey
Posts: 3,503
Default RE: Miss fire #5 cylinder, what could it be?

ORIGINAL: doughboy4.6

you are right coil or spark plug. If it is not that you may want to do a compresson test
How can you say that it's definetly either one of those two things? It could be a bunch of things.
96GT226410 is offline  
Old 04-12-2008, 08:50 PM
  #5  
35thAnni99GT
3rd Gear Member
 
35thAnni99GT's Avatar
 
Join Date: Mar 2007
Location: Where gunshots are more common than birds chirping
Posts: 504
Default RE: Miss fire #5 cylinder, what could it be?

plugged injector?
35thAnni99GT is offline  
Old 04-12-2008, 08:51 PM
  #6  
35thAnni99GT
3rd Gear Member
 
35thAnni99GT's Avatar
 
Join Date: Mar 2007
Location: Where gunshots are more common than birds chirping
Posts: 504
Default RE: Miss fire #5 cylinder, what could it be?

oh i know this is going to sound dumb, but check all the plugs going to that cylinder also, fuel and cop
35thAnni99GT is offline  
Old 04-12-2008, 09:41 PM
  #7  
Brute03
5th Gear Member
 
Brute03's Avatar
 
Join Date: Jan 2006
Posts: 2,504
Default RE: Miss fire #5 cylinder, what could it be?

+1 on swapping the coils around, and it wouldn't hurt to pull the plug to make sure it didn't foul out
Brute03 is offline  
Old 04-13-2008, 06:43 PM
  #8  
LynnBob Mustang
5th Gear Member
Thread Starter
 
LynnBob Mustang's Avatar
 
Join Date: Aug 2007
Location: PA
Posts: 2,243
Default RE: Miss fire #5 cylinder, what could it be?

Well, I took the car out today and it ran fine, CEL is still on, but it ran fine and it is not rough like it was last night.
I still haven't got my car back together fully after my paint work and the hood opening for the shaker is still not sealed for water yet. I washed the car yesterday and I flooded around the scoop opening more then I thought and water must have gotten on top the engine into the coil packs or something.

It seems to have dried itself out.

Next, will the CEL shut itself off after so many starts of not sensing the misfire or will I have to go back to Auto zone and have it turned off?

I know the wife's van CEL will turn itself off after not sensing a malfunction after so many starts, but I don't know about these cars.

Lynn

LynnBob Mustang is offline  
Old 04-13-2008, 07:25 PM
  #9  
35thAnni99GT
3rd Gear Member
 
35thAnni99GT's Avatar
 
Join Date: Mar 2007
Location: Where gunshots are more common than birds chirping
Posts: 504
Default RE: Miss fire #5 cylinder, what could it be?

^^^ you didn't say anything about washing the engine bay[8D]

yeah, that'll do it
35thAnni99GT is offline  
Old 04-13-2008, 07:33 PM
  #10  
LynnBob Mustang
5th Gear Member
Thread Starter
 
LynnBob Mustang's Avatar
 
Join Date: Aug 2007
Location: PA
Posts: 2,243
Default RE: Miss fire #5 cylinder, what could it be?

Oh minor detail... [8D]
Well, I didn't exactly wash the engine bay, too much water just got in around the shaker scoop and over ran it's gutter and spilled on to the engine around #5 cylinder because I havn't gotten everything back together so it shouldn't do that.
Atleast that's what I figured what must have happend.

Lynn
LynnBob Mustang is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
GimpyHSHS
4.6L (1996-2004 Modular) Mustang
19
12-19-2023 01:12 PM
Matt's 95 Stang
5.0L (1979-1995) Mustang
2
10-05-2015 07:16 AM
Dathan
V6 (1994-2004) Mustangs
4
10-05-2015 05:52 AM
ThatJuanStang
V6 (1994-2004) Mustangs
4
09-25-2015 08:01 AM



Quick Reply: Miss fire #5 cylinder, what could it be?



All times are GMT -5. The time now is 08:21 PM.