00' 5.4L - "spuddering" type symptom in overdrive??
#47
08-26-2014, 03:35 AM
Mountain Pass
Either find OEM replacements or go to ROCK AUTO and select one of their well known brand names.
I would use a Scanner to look at the misfire monitors and see which ones need replacement if you don't want to go with a full set of OEMs.
The problem is the public likes the low cost but has no way of knowing history of them.
At least with OEM, FORD has used them from back in the early 90s on the first COP equipped motors on the production line to this day.
Like any part they do have limits on their life span but not like the unknowns or cheap imports or you would not have an issue.
I think from about 80k up +/-, the OEM coils can fail due to the very harsh climate they live in on any motor. After all they are a maintenance item same as tires, plugs, brakes or shocks.
They get heat cycled from the head temperature, heat from the radiator, heat from the exhaust manifolds and a closed engine compartment after the motor is shut down as the temp usually rises for a few minutes then begins to cool.
This breaks internal wire connections from expansion/contraction wire fatigue (sets a code) and can cause shorted turns that is the source of misfire in OD that 'does not' set a code..
Only here will you get this perspective and experience.
Good luck.
I would use a Scanner to look at the misfire monitors and see which ones need replacement if you don't want to go with a full set of OEMs.
The problem is the public likes the low cost but has no way of knowing history of them.
At least with OEM, FORD has used them from back in the early 90s on the first COP equipped motors on the production line to this day.
Like any part they do have limits on their life span but not like the unknowns or cheap imports or you would not have an issue.
I think from about 80k up +/-, the OEM coils can fail due to the very harsh climate they live in on any motor. After all they are a maintenance item same as tires, plugs, brakes or shocks.
They get heat cycled from the head temperature, heat from the radiator, heat from the exhaust manifolds and a closed engine compartment after the motor is shut down as the temp usually rises for a few minutes then begins to cool.
This breaks internal wire connections from expansion/contraction wire fatigue (sets a code) and can cause shorted turns that is the source of misfire in OD that 'does not' set a code..
Only here will you get this perspective and experience.
Good luck.
Interesting that you mention about engine compartment heat cause when I get home after driving around when the weather is warm I open the hood to let all that heat out & leave it that way till it cools off.
#48
08-26-2014, 10:28 AM
You lost the basic cause of the misfire by hoping a plug change will clear the misfire.
It will not if there is a coil that has low output.
A plug might seem to clear the miss under 'marginal' coil conditions but it will come back to haunt you in less than 1000 miles later after the plug tip begins to erode so you end up doing double work.
You have to get over this either not looking for the coil that is faulty by using a scanner or replace all the coils hoping one of the replacements is not faulty out of the box (it does happen now and then).
This is the reality of the situation you have to deal with.
You got all the info that normally is not available like this.
Do it right or enjoy the ongoing hassle.
Good luck.
It will not if there is a coil that has low output.
A plug might seem to clear the miss under 'marginal' coil conditions but it will come back to haunt you in less than 1000 miles later after the plug tip begins to erode so you end up doing double work.
You have to get over this either not looking for the coil that is faulty by using a scanner or replace all the coils hoping one of the replacements is not faulty out of the box (it does happen now and then).
This is the reality of the situation you have to deal with.
You got all the info that normally is not available like this.
Do it right or enjoy the ongoing hassle.
Good luck.
#49
08-26-2014, 01:29 PM
Mountain Pass
#50
08-26-2014, 06:09 PM
More Turbo
Join Date: Jan 2007
Location: Wichita, KS
Posts: 538
Likes: 0
Received 0 Likes
on
0 Posts
I don't remember all of the details from the OP, but on my engine, I didn't have any codes and the mode 6 screens all showed no counts until I replaced the plugs. Then, after that, the P0302 code was set. I wonder if with so many random misfires, the computer couldn't calculate what the "right" rotation per cylinder was.
#51
08-26-2014, 06:11 PM
More Turbo
Join Date: Jan 2007
Location: Wichita, KS
Posts: 538
Likes: 0
Received 0 Likes
on
0 Posts
I don't think it would really matter. It's the cowl that really gets in the way. In my case, the hood was shading me from the sun beating down on that 100 degree, 98% humidity day with no breeze!
#52
08-27-2014, 01:39 AM
Mountain Pass
That sounds very unpleasant. I guess waiting for a cooler day was not an option.
#53
08-27-2014, 01:46 AM
Mountain Pass
#54
08-27-2014, 03:58 PM
More Turbo
Join Date: Jan 2007
Location: Wichita, KS
Posts: 538
Likes: 0
Received 0 Likes
on
0 Posts
Oh, and I had to walk uphill both ways to get to the truck. It was on the weekend, and I was to be out of town most of this week. In fact, I just got back home now. Needed to get the truck running, though, so I can get the one it's replacing listed for sale. Can't be without one with the jobs I have waiting to go to powder coat. Can't fit those in the car. So, yeah, it had to get done. I lived. Good luck with your truck. Hopefully, the coils take care of it all!
#55
08-27-2014, 05:25 PM
since yours is a 98 does it have separate coils for every cylinder. or is it just the 4.6 that has that?
#57
08-27-2014, 05:54 PM
Mountain Pass
#58
09-08-2023, 09:29 PM
Even if this is an old thread there are things to offer.
1. If a coil is faulty and fails to output enough voyage under light throttle >>when the EGR valve is commanded to open, it is because the Air to Fuel Ratio becomes very Lean. this is norma but requires the coil voltage be above amin level to fire that charge.
If it does not, misfire is the result.
2. This can be verified by looking at the mode 6, test 53 record of misfire in the program.
This misfire record cannot set a code but keeps the history because the misfires come and go according to the driving condition.
3. The Oil stabilizer is a viscosity improver that would help improve Ring Seal more than affect the cause of misfire.
Just something for you in case the issue returns.
.
I use a 1 qt. of viscosity improver to 5w20 oil in my 25 year >newer engine< a 5L DOHC for an improved Ring Seal due to a factory quality control production issue along with another Additive to solve an Oil usage issue right from the assembly line.
.
Good luck.
MODERATOR NOTE: The post about oil additives has been removed.
1. If a coil is faulty and fails to output enough voyage under light throttle >>when the EGR valve is commanded to open, it is because the Air to Fuel Ratio becomes very Lean. this is norma but requires the coil voltage be above amin level to fire that charge.
If it does not, misfire is the result.
2. This can be verified by looking at the mode 6, test 53 record of misfire in the program.
This misfire record cannot set a code but keeps the history because the misfires come and go according to the driving condition.
3. The Oil stabilizer is a viscosity improver that would help improve Ring Seal more than affect the cause of misfire.
Just something for you in case the issue returns.
.
I use a 1 qt. of viscosity improver to 5w20 oil in my 25 year >newer engine< a 5L DOHC for an improved Ring Seal due to a factory quality control production issue along with another Additive to solve an Oil usage issue right from the assembly line.
.
Good luck.
MODERATOR NOTE: The post about oil additives has been removed.
Last edited by 85e150; 10-17-2023 at 08:30 PM. Reason: add note about removed post.
#59
09-09-2023, 02:13 PM
Mountain Pass
Even if this is an old thread there are things to offer.
1. If a coil is faulty and fails to output enough voyage under light throttle >>when the EGR valve is commanded to open, it is because the Air to Fuel Ratio becomes very Lean. this is norma but requires the coil voltage be above amin level to fire that charge.
If it does not, misfire is the result.
2. This can be verified by looking at the mode 6, test 53 record of misfire in the program.
This misfire record cannot set a code but keeps the history because the misfires come and go according to the driving condition.
3. The Oil stabilizer is a viscosity improver that would help improve Ring Seal more than affect the cause of misfire.
Just something for you in case the issue returns.
.
I use a 1 qt. of viscosity improver to 5w20 oil in my 25 year >newer engine< a 5L DOHC for an improved Ring Seal due to a factory quality control production issue along with another Additive to solve an Oil usage issue right from the assembly line.
.
Good luck.
1. If a coil is faulty and fails to output enough voyage under light throttle >>when the EGR valve is commanded to open, it is because the Air to Fuel Ratio becomes very Lean. this is norma but requires the coil voltage be above amin level to fire that charge.
If it does not, misfire is the result.
2. This can be verified by looking at the mode 6, test 53 record of misfire in the program.
This misfire record cannot set a code but keeps the history because the misfires come and go according to the driving condition.
3. The Oil stabilizer is a viscosity improver that would help improve Ring Seal more than affect the cause of misfire.
Just something for you in case the issue returns.
.
I use a 1 qt. of viscosity improver to 5w20 oil in my 25 year >newer engine< a 5L DOHC for an improved Ring Seal due to a factory quality control production issue along with another Additive to solve an Oil usage issue right from the assembly line.
.
Good luck.
Thread
Thread Starter
Forum
Replies
Last Post
2006FOMOCO
Clutch, Transmission, Differential, Axle & Transfer Case
7
10-15-2023 06:12 PM