Another rough running V10
Thread Starter
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Mountain Pass
Joined: Nov 2000
Posts: 124
Likes: 18
Another rough running V10
Hi,
I have a '99 F250 SD crew cab with the v-10. It only has 49000 miles as I mainly use it for hauling and towing (I have other vehicles for day to day stuff, hence the relatively low miles). For the last few months, I have noticed my fuel mileage has been dropping, and I can feel what I believe is a slight miss at idle. Recently, however, it has been acting up in that, while slowing down to a stop, the idle will drop very low for a second or two and then it will return to normal. Today it finally threw a check engine light. I don't have a scanner (yet), but I wanted to ask you guys your opinions. What I have done so far is this:
* change fuel filter
* clean MAF
* clean TB
* clean IAC
The coils and plugs are original. My gut feeling is that one (or more) coils are going bad. I was planning on changing out the coils, but leaving the stock plugs in there (b/c of the low miles).
If this were *your* truck, what would you do?
Thanks
Mark
I have a '99 F250 SD crew cab with the v-10. It only has 49000 miles as I mainly use it for hauling and towing (I have other vehicles for day to day stuff, hence the relatively low miles). For the last few months, I have noticed my fuel mileage has been dropping, and I can feel what I believe is a slight miss at idle. Recently, however, it has been acting up in that, while slowing down to a stop, the idle will drop very low for a second or two and then it will return to normal. Today it finally threw a check engine light. I don't have a scanner (yet), but I wanted to ask you guys your opinions. What I have done so far is this:
* change fuel filter
* clean MAF
* clean TB
* clean IAC
The coils and plugs are original. My gut feeling is that one (or more) coils are going bad. I was planning on changing out the coils, but leaving the stock plugs in there (b/c of the low miles).
If this were *your* truck, what would you do?
Thanks
Mark
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
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From: Long Island USA
At 12 years old, those plugs are not doing you any favors. I would use penetrating oil, spray it down the holes, wait a few hours for it to penetrate, loosen the plugs CAREFULLY (a little at a time, spraying more oil down there as you are doing it), and replace.
You really REALLY need to get the codes read to find out what's going on. It could be anything, and after doing all that work, it would SUCK to find out it didn't help.
You really REALLY need to get the codes read to find out what's going on. It could be anything, and after doing all that work, it would SUCK to find out it didn't help.
Moderator
Joined: May 2004
Posts: 6,513
Likes: 906
From: Home Base Nebraska
Before you get to carried away replace your boots and check the plug torque or replace the plugs. I just changed all of my boots and they where no longer sealing where they went into the head letting moisture in causing a random misfire. Truck runs like new again 
. Remember rubber doesn't last forever either time or mileage will get to it. I bought mine for $4.58 each at NAPA.
Denny
. Remember rubber doesn't last forever either time or mileage will get to it. I bought mine for $4.58 each at NAPA. Denny
Thread Starter
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Mountain Pass
Joined: Nov 2000
Posts: 124
Likes: 18
I'm getting a scangauge today..I had already ordered it, so I guess we'll see what codes it pulls tonight when I get home and try it out.
Oh, believe me, with the issues with spark plugs on these motors, I will not R&R them without knowing what the code(s) are.
IF I replace the plugs, should I go with Motorcraft platinum or is there a better alternative?
Thanks
Mark
Oh, believe me, with the issues with spark plugs on these motors, I will not R&R them without knowing what the code(s) are.
IF I replace the plugs, should I go with Motorcraft platinum or is there a better alternative?
Thanks
Mark
Moderator
Joined: May 2004
Posts: 6,513
Likes: 906
From: Home Base Nebraska
I'm getting a scangauge today..I had already ordered it, so I guess we'll see what codes it pulls tonight when I get home and try it out.
Oh, believe me, with the issues with spark plugs on these motors, I will not R&R them without knowing what the code(s) are.
IF I replace the plugs, should I go with Motorcraft platinum or is there a better alternative?
Thanks
Mark
Oh, believe me, with the issues with spark plugs on these motors, I will not R&R them without knowing what the code(s) are.
IF I replace the plugs, should I go with Motorcraft platinum or is there a better alternative?
Thanks
Mark
Denny
Thread Starter
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Mountain Pass
Joined: Nov 2000
Posts: 124
Likes: 18
So I pulled a P1405 code....I changed that sensor about a year ago...I can't believe it's going bad already.
Looks like I'm going to be pulling plugs and replacing with new ones and I'll be doing the boots at the same time.
Thanks
Mark
Looks like I'm going to be pulling plugs and replacing with new ones and I'll be doing the boots at the same time.
Thanks
Mark
Senior User
Joined: Feb 2011
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From: FT. Rucker AL
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Freshman User
Joined: Jun 2011
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From: Milford
I had the same issue. I replaced the spark plugs and put EBay coils ($104). The coils fixed my issue (120k miles).
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Moderator
Joined: May 2004
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From: Home Base Nebraska
. Now that you can't see them anymore you have to guess, but form experience a random miss is caused by bad wires/boots or plugs.Denny
Thread Starter
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Mountain Pass
Joined: Nov 2000
Posts: 124
Likes: 18
Well, I was driving the truck last Tuesday going to pick up my daughter from camp and it just started running REAL rough. When I pulled in and stopped, it sounded like the thing had a big cam in it 
....so, I guess at this point, it's totally dropped out to 9 or maybe even 8 cylinders. New accel coils and motorcraft platinum plugs will be in soon, everything is getting replaced!
....so, I guess at this point, it's totally dropped out to 9 or maybe even 8 cylinders. New accel coils and motorcraft platinum plugs will be in soon, everything is getting replaced!
Thread Starter
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Mountain Pass
Joined: Nov 2000
Posts: 124
Likes: 18
Update: I got the coils off and the plugs out. The coils "look" good (no visible cracks, no signs of carbon in the boots), the boots looked fine. I tested the resistance with an ohm meter and all were 0.5-1.0 ohms, which I believe is within spec. I'm going to gap the Motorcraft sp-479 (i.e agsf22wm) plugs to 0.54 and reinstall them tomorrow. Hopefully the truck will be running by Sunday afternoon (I'm REALLY taking my time here...which is SO unlike me!).
Mark
Mark
Thread Starter
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Mountain Pass
Joined: Nov 2000
Posts: 124
Likes: 18
Well, today I got the new coils and plugs in, everything is buttoned up correctly. I started up the truck...and it's still running like crap. It seems to rev smoothly, but it idles like a big-block with a giant cam in it (very lopey).....not exactly what I was hoping for.
So, assuming this thing will eventually throw a damn code...how long do I have to drive around with it like this to get it to tell me something???
Anybody else have symptoms like this?
Thanks
Mark
So, assuming this thing will eventually throw a damn code...how long do I have to drive around with it like this to get it to tell me something???
Anybody else have symptoms like this?
Thanks
Mark