Question about 1999 Ford F150 Regular Cab

1 Answer

5.4 Ford Stumbling Acceleration

I have a '99 F150 with the 5.4 Triton. When truck is idling, it runs fine and doesnt miss a beat. But when accelerating or pulling uphill, it becomes sluggish and misses, causing the truck to shake and sputter. I am looking for common solutions, since the truck refuses to give me a check engine light, so i cant run a diagnostic on it. Was NOT expecting this when my grandad sold it to me. Any help is appreciated.

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1 Answer

You can have very bad COP Ignition Coils without a Mil
Lamp on dash

You can also run Mode #06 on professional scan tool software,
to look at cylinder misfire counts,but need to have someone
drive it, while you look at data.

The EGR Valve or other egr items, could cause the uphill
thing, as your in a high vacuum mode & the coils will break
down as well

I wouldn't throw around the word diagnostic, as your only
looking for stored data, Generic or MFG --with a code reader
or professional scanner,that is no big deal or any computer
involved

O2 Sensors get replaced every 100,000 miles or so,&
yours may have never been done

You obviously need to start will new spark plugs,OEM
config,not some fancy thing with prongs,they won't work
in most fords.

Make sure there is no vacuum leaks anywhere including
exhaust leaks before the converter.

Check PCV Systems is tight & works

Check TPS Voltages

Test,don't replace anything,ever,have to fail a test to
need new parts,except plugs,O2,gas & air filter.

Posted on Oct 26, 2012

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Posted on Jan 02, 2017

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  • 4 Answers

SOURCE: misses during acceleration , rough

Go get the codes ran at auto zone or advance auto parts they will do it for free. If the codes come up as a cylinder miss-fire then it is most likely a coil (being a ford). Write down which cylinder it is. I wouldn't replace any of the spark plugs , useless you have more than 100,000 miles. If you have to replace the spark plugs use BOSH double plautim or better. The cylinder placing is ( as your are looking at the front of the truck) passenger side front to back 1-2-3-4 driving side front to back 5-6-7-8. If you never seen a coil buy one so you know what you are looking for. The coil is held in by a 7mm bolt. Take the bolt out and replace the coil. Problem Solved. Estimated time 20 Mins with 60 dollars per coil.

Posted on Mar 18, 2009

  • 1608 Answers

SOURCE: 2001 ford f150 w/4.2 v6 run rough under load or

Have the check engine light codes checked.This will tell you what to look for and what could be causing the problem.Auto Zone will check codes for free.There are other part stores that will do this for free.Let me know what codes you get and I`ll be glad to help.Good luck.

Posted on Mar 25, 2010

  • 1 Answer

SOURCE: boggs or runs rough during acceleration

sounds like you need a tune up or a coil is bad

Posted on Jun 17, 2009

  • 1 Answer

SOURCE: 2001 ford sport trac sluggish pulling out smooth idle

Silly dumb western aouto they gave me the wrong cable I put back the cable from befor and it corrected the problem thanks for your help.

PS: for the people who are going to change the spark plug cable and spark plugs be wise make sure they give you the same cabe and spark plugs because ford engine dont like after market stuff.

Posted on Nov 24, 2008

emissionwiz
  • 76846 Answers

SOURCE: 1995 Ford F150 Acceleration Issues

I THINK THEY MAY HAVE DAMAGED THE PLUG WIRE BOOTS, TAKE A LOOK AT THEM AND SEE IF THE RUBBER BOOTS ARE TORN OR DAMAGED, CHEAP TUNE-UP SHOPS ARE FAMOUS FOR CAUSING THIS KIND OF DAMAGE, THERE IS A SPECIAL TOOL TO REMOVE THE WIRES WHICH GET STUCK TO THE PLUGS, MANY YOUNG KIDS DO THE WORK BUT DON'T EVEN KNOW THE TOOL EXISTS.

Posted on Nov 05, 2008

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------------------

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http://technoanswers.blogspot.in/2012/03/rough-idlestaling-and-erratic-shifting.html

-----------

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There are many other possibilities causing these idle issues.Engine idles rough.

There are few help links with solutions to troubleshoot such idle issues.

I suggest you refer the link below and follow its troubleshooting details:------

Click the link below:-----
Bad miss at idle? http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html

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http://schematicsdiagram.blogspot.in/2012/03/stumbling-and-stalling-at-idle-after.html

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http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html

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Engine stumbles coming off idle when warm?

http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html

------------------
Erratic idle on car?

http://schematicsdiagram.blogspot.com/2011/12/erratic-idle-on-car.html

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http://repairhelpcenter.blogspot.com/2012/10/cold-start-problem-and-vehicle-shudder.html

----------
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http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html

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http://technoanswers.blogspot.com/2012/10/gmc-sonoma-stalls-and-idles-low.html

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http://schematicsdiagram.blogspot.com/2011/12/gmc-idle-air-control-iac-valve.html

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http://repairhelpcenter.blogspot.com/2011/10/1996-camry-intermittent-engine-failure.html

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http://repairhelpcenter.blogspot.com/2011/10/engine-quits-at-idle.html

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http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html

---------

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http://repairhelpcenter.blogspot.com/2012/10/high-idle-problem.html

-------
While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

---------
Idle flair is noticed on car? Rough idle? car will not idle? Erratic idle speed?

http://technoanswers.blogspot.in/2012/02/idle-flair-is-noticed-on-car-rough-idle.html

--------
High rpm in neutral? Inconsistant high RPM in neutral?

http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html

-------
Vehicle stumbling at idle and shows code 54?

http://schematicsdiagram.blogspot.in/2012/03/vehicle-stumbling-at-idle-and-shows.html

----------
Rough idle, staling and Erratic shifting?

http://technoanswers.blogspot.in/2012/03/rough-idlestaling-and-erratic-shifting.html

-----------
While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

---------

These details will help.

Thanks.

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