Spark plug questions/misfire

[Ps4acc88]

I'm having issues with my truck, when pressing on the gas at times it jerks. If I let off, or if I press on it hard it goes away. I have taken it to a couple of shops and all they do is run a scan but nothing comes up, they push back on messing with it until the computer registers an issue. Reading post and watching some videos, I think it might be spark plugs/coil packs. I was planning on replacing them as I'm sure they are way past due (bought truck with 120k) it's now at 148k so even if it's not the issue they need to be replaced.

1st question) would you guys/gals agree that the spark plugs and coils might be the culprit? (No check engine light but I read many post where people said they had coil/plug problems with no check engine light.

2) my truck was made Feb of 2007, I read they stopped using the 2 piece plugs in 07 and some people with 07s dont have the plug breaking issues, is this false?

2007 expedition
4wd
148k miles
The fuel pump was replaced last year along with fuel filter

 

[Plati]

Could that be a transmission / drive train problem?
Does it "sound" like the engine is having difficulty?

If you plan to keep the thing, definitely do plugs but I would diagnose the current problem not just throw plugs/cops at it. Its possible to introduce new problems with parts replacement when those parts are not the current problem.

What I did earlier this year was buy a $20 OBDII bluetooth device so that "when my Expy had an issue" I could immediately pull over and check for a code. If I had waited until I got it to the shop, code would have vanished.

 

[1955moose]

It's about a 2-3 hour job including soldering. Depends on shop, and their labor rate. Here in the bay area, dealers are $175.00 per, private shops $90.00 to $150.00 per hour. Real estate/rentals are insane is why!

Sent from my N9131 using Tapatalk

 

[1955moose]

Sorry meant to post on the section for guy that had speedo problem.

Sent from my N9131 using Tapatalk

 

[Ps4acc88]

I downloaded an obd app this is what I got in ref to misfire, I dont know how to read this so if someone does I would greatly appreciate this


https://imgur.com/a/KXQzsqP

 

[BRIANGEE]

It could be any number of issues. If you can recreate the issue at roughly the same gas pedal location it could be a faulty throttle position sensor. But you will have to test it. Next time you drive it make a note of when it acts up such as going uphill? Level? A certain RPM range? Certain throttle position? etc.. it will help others help you out.

 

[Ps4acc88]

It could be any number of issues. If you can recreate the issue at roughly the same gas pedal location it could be a faulty throttle position sensor. But you will have to test it. Next time you drive it make a note of when it acts up such as going uphill? Level? A certain RPM range? Certain throttle position? etc.. it will help others help you out.

Happens right as you are getting into 40mph. Does not do it at lower speeds, or higher speeds. Starts at right before 40mph to 45mph. If I let off, it stops, if press down on the pedal it goes away.

 

[gixer2000]

I downloaded an obd app this is what I got in ref to misfire, I dont know how to read this so if someone does I would greatly appreciate this


https://imgur.com/a/KXQzsqP

I took a look at the mode 6 image you posted and looks like cylinder 1 is your biggest issue but definitely seeing misfires all across the board. I would start with plugs amd go from there. If the mis continues move cylinder 1 coilcoil to another cylinder to see if the major mis follows.

Also from what I have seen in the past it was mid 08 that got the plug update not 07. They are identified by a brown boot on the coil vs a black boot.

 

[curtis-bob]

Replacing the spark plugs is not that hard... you do have the danger of breaking them off but there are a few things that yon can do to help... 1. Pickup or borrow a half inch Impact. 2. Run the engine to running temp. 3. use the impact on the Spark plugs. I have done this a tone with no Fail..
NOW I still have to warn you that it is a possibility where it can brake off in the head.. and I have done both sending to ford and getting a tool to remove them.

bottom line if you chose to do it your self DON"T try with a normal hand wrench. if you do you will need this tool.

https://www.summitracing.com/parts/lil-65600?seid=srese2&cm_mmc=pla-msn-_-shopping-_-srese2-_-lisle&utm_source=bing&utm_medium=cpc&utm_campaign=Bing+Shopping+Ads&utm_term=1100100887795&utm_content=All+Products.

It is a must... all the other removal tools are not exactly useful this one is a slam dunk... its what my ford dealer used to get mine out.


Coil packs are so simple to replace... if I were you... just replace the coils first THEN if you still have problems take on the spark plug replacement.


when it comes to ODBII readers I bought a reader from amazon for $20

https://www.amazon.com/gp/product/B00UFL2HP0/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

then you can install the ForScan app on your phone or laptop. and in there you can actually watch live to see a miss fire count from the time you started the engine to current time.. this will tell you what you need to know...

This is what I do with the 5.43V... bottom line don't be afraid of this fix... its easy.. and you can usually do it without any tools... (unless the sparkplug actually does break then you need to get that tool)

 

[Ps4acc88]

I took a look at the mode 6 image you posted and looks like cylinder 1 is your biggest issue but definitely seeing misfires all across the board. I would start with plugs amd go from there. If the mis continues move cylinder 1 coilcoil to another cylinder to see if the major mis follows.

Also from what I have seen in the past it was mid 08 that got the plug update not 07. They are identified by a brown boot on the coil vs a black boot.

Thanks for the reply, I think I'm just going to replace all plugs and coil packs, will report soon.