I need help plz

Asked by Dec 23, 2015 at 06:23 AM about the 1999 Ford F-150 Lariat 4WD Extended Cab LB

Question type: Maintenance & Repair

I have a Ford F-150 with the 4.6v8! My problem is I
bought the truck from a guy that had it sitting up for a few
years! Amazingly with a hot battery it crunk and ran (
missing terribly )! It had a check engine so I put a code
reader on it to find out #5 was missing! So common since
I started cheap plugs were first, afterwards my miss went
to #6 immediately changed wires and finally no check
engine( mind you it was running allot better than day 1)
but it still has so power it idles rough just like its missing
still, I have tried injector cleaner also a air filter but still no
change! My fuel mileage is terrible and over drive is
literally pointless because of how bad it lugs!!! I think I
have ruled out a firing problem but I am lost on this
vacuum system! Any input at all will be much appreciated!
I have also considered fuel problem but how could I check
fuel pressure or better yet how would I check a vacuum
system! If I could jus get a few tips and a starting point I
think I can handle it but as of now I'm lost!!!!!

Advice would be appreciated~|. Sincearly

A frustrated ford owner

3 Answers

242,255

If the truck was sitting for a few years, the gas will be not usable, I hope you drained it. If not, that might be one of your issues. You can check fuel pressure with a gauge, you can rent one at any local auto parts stores, check online, or Utube for demonstrations.

18,850

Siphon out all the gas in the tank. Change the fuel filter. Hopefully it is not part of the fuel pump inside the tank, as in newer F-150's. Now check the fuel pressure at the engine. Gauges can be purchases for 25 bucks. The readings can be obtained from the net as well as the testing procedure. Check resistance on your wires via multi-meter. New Fords suppose to be about 5K ohms per foot, but check for your model. Use the multi-meter to check the primary and secondary coil. The NET will show you how. Check the easy and little cost items first. Don't throw parts at it until you determine the problem.

You could have some stopped up injectors cause even if you put injector cleaner in it they can still have a ball of gummed up gas in them from sitting up, or a bad coilpack because if you have the 8 coilpack system like mine I had to replace one just about every week until I replaced them all when I first got my truck, or a stopped EGR valve which happens to my 98 all the time, and as far as the vacuum system one of the lines could have a hole in it from being dry rotted and the only way to find the hole is to crank the truck and get a can of starter fluid and spray down the lines and if you hit a hole in the line it will start clear up the rough idling but the vacuum lines and injectors are probably your best bet cause they won't throw the check engine light

Your Answer

Add photo

Related Questions

  • I need help plz 3 answers

    I have a Ford F-150 with the 4.6v8! My problem is I bought the truck from a guy that had it sitting up for a few years! Amazingly with a hot battery it crunk and ran ( missing terribly )! It had a ...

    1999 Ford F-150 Lariat 4WD Extended Cab LB

    -

    Maintenance & Repair

  • I need help 4 answers

    I have a 2007 Ford F150 XLT Triton My problem when I first start my truck the idel is high it runs great, but after truck warms up it stalls went I apply the brake it stalls. I noticed in drive the ...

    2007 Ford F-150 XLT

    -

    Maintenance & Repair

  • I need the firing order on a Ford F159 v6 1995...I need help 2 answers

    I need help

    1995 Ford F-150 XLT LB

    -

    Maintenance & Repair

  • I need help on a 2008 f150 2 answers

    I have a f150 I've changed all the sensors and all new timing and new plugs. It started and run but it want start now and I've checked the firing and it's getting gas so why want it start plz help...

    2008 Ford F-150 XLT 4WD

    -

    Maintenance & Repair

  • need help!!! 3 answers

    I need a new brain box for my 1978 f150 ranger xlt and have no idea where i can find one. Any help would be greatly appreciated!!!

    1978 Ford F-150

    -

    Maintenance & Repair

F-150

Looking for a Used F-150 in your area?

CarGurus has 207,301 nationwide F-150 listings starting at $1,499.

ZIP:

Search Ford F-150 Questions

Ford F-150 Experts

#1 OJ
OJ
Reputation 8,210
#2 dandyoun
dandyoun
Reputation 4,390
#3 tennisshoes
tennisshoes
Reputation 2,880
View All

Related Models For Sale

Used Chevrolet Silverado 1500
1,769 Great Deals out of 181,161 listings starting at $250
Used GMC Sierra 1500
761 Great Deals out of 69,110 listings starting at $1,850
Used Dodge Ram 1500
411 Great Deals out of 10,835 listings starting at $1,400
Used Ford F-250 Super Duty
329 Great Deals out of 46,256 listings starting at $1,450
Used Toyota Tundra
436 Great Deals out of 34,736 listings starting at $2,990
Used Toyota Tacoma
472 Great Deals out of 41,615 listings starting at $1,995
Used Ford Mustang
543 Great Deals out of 45,840 listings starting at $1,999
Used Ford F-250
469 listings starting at $2,000
Used Ford Explorer
926 Great Deals out of 70,243 listings starting at $997
Used Chevrolet Tahoe
556 Great Deals out of 31,361 listings starting at $1,500
Used Ford Ranger
176 Great Deals out of 5,676 listings starting at $950
Used Ford F-350 Super Duty
376 Great Deals out of 25,766 listings starting at $1,995

Used Cars For Sale

2018 Ford F-150 For Sale
51 listings starting at $35,135
2017 Ford F-150 For Sale
26 Great Deals out of 133,513 listings starting at $18,022
2016 Ford F-150 For Sale
88 Great Deals out of 13,553 listings starting at $18,300
2015 Ford F-150 For Sale
204 Great Deals out of 8,342 listings starting at $16,999
2014 Ford F-150 For Sale
385 Great Deals out of 12,684 listings starting at $6,600

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.