Guests - If You want access to member only forums on FM. You will gain access only when you Sign-in or Sign-Up on Fishing Minnesota.

It's easy - LOOK UPPER right menu.

Sign in to follow this  
Followers 0
dakotakid31

'99 f-150 ruff idle

19 posts in this topic

i have a '99 f-150 with the 5.4 that started idling ruff when i put it in gear(auto) jumps from 5-6000rpms. started doing it half way to mille lacs..said screw it and kept going. made it there and back with the boat but the engine light was flashing which in the manual says it is missfiring. i should put her in her grave (175000 miles) but wanted one more winter, even my son tells me i need a new truck when he rides in it. i wont be able to get it into a shop until next week so i was just wondering what all you wrench heads thought of it. fuel pump? coil packs? i know it could be many things just wanted your guesses.

Share this post


Link to post
Share on other sites

9 times out of ten coil over plug. I would go to local parts store and see if they will scan it for free and see what cly. it is. Could be a cracked or worn plug.

If you take in it would cost you around $180.00 to $250.00 for one coil over plug installed. Should include Diag.

Good luck!

P.S.

It is probobly raining when it started to run rough!

Share this post


Link to post
Share on other sites

I'll take a guess that it may be a coil failure (but a computer diagnosis will definitely tell ya.. grin.gif). I had this happen once years ago, don't know which number coil, but it was the far back coil on passenger side. My mechanic friend said there is a common coolant leak out of a coolant line above the coil and the moisture shorted out the coil. He fixed the leaking hose and no more problems. Definitely get the truck looked at...

Share this post


Link to post
Share on other sites

ChuckN,

You are correct! The coolant heater by-pass hose would leak anti-freeze onto coil.

Share this post


Link to post
Share on other sites

The coil packs on these are a very comon problem, if you can get the code pulled by someone, I would replace all 8 plugs, if it hasnt been done recently, then replace the coil pack on the cylinder that has the code. The #4 has a heater hose above it that the screw clamp leaks on them, there is a updated hose and clamp. So if it is #4 check the hose above it also.

Share this post


Link to post
Share on other sites

I had a 98 f150 6 cyl that start running really bad. I took it in they told me the converters were bad and wanted $2700 to replace. I took it to a guy in Monticello he would replace them with and after market for $300. He check them out and said they were good. I put some seafoam in the gas tank it did wanders, every couple months I would do the same.

Share this post


Link to post
Share on other sites

Mechanic in a can!! It can clean internal engine parts, and loosen up converter particles. But its not the answer for everything. I think in this case, he has a bad coil pack. Pretty easy do it yourself fix, just as easy as replacing plugs. OK in this case its not really easy, but the average joe should be able to replace a coil pack and plugs.

Share this post


Link to post
Share on other sites

the plugs were recently replaced. it wasnt raining when it first happened. the dude at the ford dealer was trying to tell me it sounded like a fuel pump- but i always thought they were like a light switch, it either worked or didnt. coil sounds like the deal. i dont think they make an engine that is easy to work on anymore!!but changing out a coil shouldnt be to bad. i will find somewhere to scan it to narrow the search.oh and i already dumped the seafoam in the same day.lol...always worth a shot.the truck is only used for towing the boat or hunting i drive a work vehicle and the reason i dont want to buy a new one yet is because i am not sure what i want. this truck is like frankinstien- 30k had the engine replaced by ford due to a bad head gask that tore the engine up.74k i was one of the many lucky ones that had a spark plug blow out the head but the tranny is original and has never had any problems-well until i just jinxed myself. but hey thanks guys i knew someone would have some ideas.

Share this post


Link to post
Share on other sites

If you get in scaned, let us know what you come up with.

Share this post


Link to post
Share on other sites

If it is a coil, from what I have read on them, there will be more coils going bad to follow. You can get a set of 8 aftermarket coils off of the big auction site that starts with an E for around $120 for the whole set. I know guys that have been running them for 2 years and no problems. Worth a shot, rather than spending $200 at a dealer for just 1 coil on plug.

Share this post


Link to post
Share on other sites

I had the same problem with my 2001 and it was the coils. I also replaced the spark plugs and the bill was around $800. I replaced all the coils. Good Luck

Share this post


Link to post
Share on other sites

Mouisture is a funny thing. Concern with rough running is there one moment and gone the next.

One back yard mechanic thing to try is to perform a hot soak test. Get eng. up to running temp and spray down with water. You trigger a miss fire code or eng. starts running funny, it is a ign. type concern. Cheap and easy to do and also rules out fuel pump!

I seen it done at dealership 2-3 times a day to figure out concerns.

What dealer did you bring it to ER or Monti?

Share this post


Link to post
Share on other sites

I would rather replace the coil or coils that are failed. Just spend the $15-$30 dollors, instead of all that work and $120 dollors. If you have to buy the whole 8 of the C.O.P., save the good ones and replace only the bad one at that time.

Some peole have problems others did not. I have seen one coil replaced in 150,000 miles and I have seen all 8 replaced in 30,000. Its a crappet shoot!

Good luck!

P.S.

Good tip on were to get coils cheap cool.gif

Share this post


Link to post
Share on other sites

Quote:

Mouisture is a funny thing. Concern with rough running is there one moment and gone the next.

One back yard mechanic thing to try is to perform a hot soak test. Get eng. up to running temp and spray down with water. You trigger a miss fire code or eng. starts running funny, it is a ign. type concern. Cheap and easy to do and also rules out fuel pump!

I seen it done at dealership 2-3 times a day to figure out concerns.

What dealer did you bring it to ER or Monti?


Shack, the water trick works great, on engines when the plugs go through the sides of the engine, but when the plugs go through the top, like the 4.6, and the 5.4 water will soak down into the plug area and will short out the coil packs. Such as the #4 with the coolant leak on the cop.

These coils do not like water at all, if you ever wash the top of your motor, plan on buying 8 coil packs, you will need them in about a month, 1 at a time! Over the years of working on cars, the water spray bottle has worked great for all the other engines to diag missfires, I would grab the spray bottle soak the wires, load the engine and look for my arcing wire. But that doesnt work with the engines with the plugs going through the top of the engine, water will just soak down and short the coil, or wire out.

Share this post


Link to post
Share on other sites

I figured it would cause a weak point to show its self, but if every thing is working as it should, water should not be an issue..

Maybe it was tech's looking for future work when I have seen it done on 4.6 or 5.4 grin.gif.

Share this post


Link to post
Share on other sites

it was the monti ford that said that. debating weather to stay home from up north this weekend to mess around with it or say screw it till next week...lol. i took a look and that coolant hose is not leaking at all and i should be able to get at all the coils..but what a joke.

Share this post


Link to post
Share on other sites

Bumper to bumper or checker in monti should be able to scan! At least let you scan with their scanner! I think all you have to do is leave Drivers Lic. at counter and they let you bring scanner out to your car.

If not try advanced auto in Elk river by walmart!

If it is a coil, it will not hurt to drive a while! A little poor fuel econ and check eng... I would tae care of first, but in a pinch it would not stop me from driving to work or on a major run! IMO!!!

Share this post


Link to post
Share on other sites

well you guys are good!. went to oriely's and borrowed the scaner- #5 was miss firing. replaced the coil pack( one of the easiest ones and it still blew goats) runs like a champ now...thanks fellas!!

Share this post


Link to post
Share on other sites

Good to hear!

Share this post


Link to post
Share on other sites
Guest
This topic is now closed to further replies.
Sign in to follow this  
Followers 0



  • Posts

    • trebormorgan
      It's Thursday, March 23rd, and we're still running four wheelers on many of the lakes north of Brainerd. The panfish action was hot last weekend, especially up in the shallow spikes close to deep water. The small cold-snap that hit early in the week seemed to slow the bite and push some fish out on the breaks that lead to shallow spikes. It's a special time of year. I watched my brother release multiple slabs over 14", multiple walleyes over 20", and some nice bass, all while fishing in 5 ft of water. It doesn't happen to us often, but it last weekend it was hard to find the eater-size crappies. Almost every fish was over 13". Good times.    How's everyone else doing out there?  Any new suggestions on panfish presentations, jigs, plastics..etc?   Good luck to all that get out on the last ice, and be safe!
    • Capt. Quicksteel
      Welcome to Minnesota. I moved to the metro from way up north about 20 years ago so faced some of the same questions. Once I scouted a bunch of local WMA's I found several that didn't get much bow hunting pressure. Most days you're by yourself. But you have to be prepared for the unexpected. Once I was in a tree stand near some water. Right after sunrise I heard some shooting and shouting and a minute later a nice looking black lab ran past my stand with a mallard in his mouth! I didn't even know they were sitting in a blind down the shore from me. All in all I have had pretty good luck at finding places to hunt especially if you can go during the week.
    • Rick
      Following the pattern observed in neighboring states, white-nose syndrome, a disease that can be fatal to hibernating bats, has now been confirmed in six Minnesota counties, according to the Department of Natural Resources.  The disease has recently been confirmed in Becker, Dakota, Fillmore, Goodhue and Washington counties. Minnesota’s first confirmed case of WNS was in St. Louis County last March. The disease is named for the white fungal growth observed on infected bats. It is not known to pose a threat to humans, pets, livestock or other wildlife. The recent DNR bat surveys have recorded declines in the annual bat count ranging from 31 to 73 percent in locations where WNS has been confirmed. The 73 percent decrease was observed at Soudan Underground Mine in St. Louis County, where the disease was first confirmed in Minnesota a year ago. DNR biologists think the sharp decline there may reflect how long the disease has been present. With WNS confirmed in Fillmore County in southeastern Minnesota, the count at Brightsdale Tunnel was down 39 percent from last year, and the count at Bat River Cave decreased 31 percent. “While some locations are still testing negative, the results of recent surveys lead us to conclude that WNS is likely to be present anywhere bats hibernate in Minnesota,” said Ed Quinn, DNR natural resource program supervisor. “Four of Minnesota’s bat species hibernate, and four species migrate. WNS will have a substantial effect on Minnesota’s hibernating bat population. Neighboring states have reported declines of 70 to 95 percent in specific locations, as we recorded this year at Soudan Mine.” Although the disease is transmitted primarily from bat to bat, people can inadvertently carry fungal spores to other caves on clothing and caving gear. For several years, public tours of Soudan Underground Mine and Mystery Cave have begun with a brief lesson on how to prevent the spread of WNS. Both before and after tours, visitors are required to walk across special mats designed to remove spores from footwear, and they are advised not to wear the same clothing, footwear or gear when visiting other caves or mines where bats may be present. Multiple washings in a standard washing machine will not provide sufficient decontamination. Tours will continue at Soudan Underground Mine and Mystery Cave, where the DNR will continue to follow recommended national decontamination protocols to prevent human transport of fungal spores. The DNR urges owners of private caves to learn about WNS and take similar visitor precautions as outlined in the protocols. The DNR is working with federal and state officials to consider a variety of treatment trials, to test new fungicides that may kill WNS spores. Treatments are unlikely to eradicate WNS, but could slow the spread and reduce the number of bat deaths. DNR biologists conduct winter bat counts in several Minnesota hibernacula each year. “We use these counts to compare the number of bats in a site from year to year. Although we count all of the bats that we see, more are likely in areas we can’t reach,” said DNR mammalogist Gerda Nordquist. WNS was first documented in North America in 2007 in eastern New York and has since spread to 30 states and five Canadian provinces, killing more than 5.7 million bats. Nordquist encourages anyone who sees a sick or dead bat to submit a Bat Observation Report. DNR staff reviews these reports and additional follow-up or testing is conducted as needed. To learn more about WNS and Minnesota’s bats, visit mndnr.gov/wns. Discuss below - to view set the hook here.
    • Tom Sawyer

            Can't fix stupid! That crack, now forming a pressure ridge, about mid-lake, is plenty reason not to drive even a car out there. Won't take much to break that lake apart soon the way it was chuckin ice, especially rain. Some areas had 12". Hopefully the heavy rain stays away.
    • Neutz68
      Thinking about heading up to the Backus - Hackensack area this weekend.. How did the ice survive this week up there??