2003 Ford F-150 bad misfire

Asked by May 25, 2015 at 03:26 PM about the 2003 Ford F-150

Question type: Maintenance & Repair

My truck is missing really bad. Check engine
light came on and code says lean on bank 1.
I changed COP's, plugs, and fuel filter. Ran
good for a couple months and just started
doing it again. Noticed one day my iat
sensor was out and hanging down one day. I
don't know if this has anything to do with it
or not

2 Answers

86,655

That would lean it out even more, check the fuel pressure and flow, if that checks good then clean the injectors either professionally or use some SeaFoam or Techron in the fuel tank.

130

Maybe check your mass air flow sensor. If it is malfunctioning it can read too lean or too rich! Try cleaning it......

Your Answer

Add photo

Related Questions

  • Ford F150 knocks and misfires bad all of the sudden 10 answers

    The day before the truck ran fine.The next morning It was knocking and running on what sounded like 3 or 4 cylinders.I took it to the local Ford dealer and paid 70 bucks to have it hooked to their dia...

    2000 Ford F-150 XL Extended Cab SB

    -

    Maintenance & Repair

  • 2006 Ford F-150 9 answers

    I have a 2006 Ford F-150 and when i'm driving on the highway and i push the gas i hear a rattling coming from the front, can anybody tell me what that could be

    2006 Ford F-150

    -

    Maintenance & Repair

  • Engine misfire 1 answer

    At first I would die no fire replace coil. distributor.plugs wires computer working harness know it will misfire tach goes crazy .turn off ignition restart runs fine.. Helppp

    1990 Ford F-150 STD 4WD SB

    -

    Maintenance & Repair

  • Help with misfires

    I have a 2005 F150 4.6 that was running rough. I changed all the plugs and coils and it got a little better but still rough. Now I have a clicking sound at low rpm in drive but not neutral. Connecte...

    Ford F-150

    -

    Maintenance & Repair

  • 2003 Ford Taurus SES Misfire only at idle 1 answer

    I have a 2003 Ford Taurus SES with the 24 Valve engine. It started misfiring about a month ago and the trouble code reads cylinder #3 misfire detected. It only misfires while idling, under accelerat...

    2003 Ford Taurus SES

    -

    Maintenance & Repair

Search Ford F-150 Questions

Ford F-150 Experts

#1 OJ
OJ
Reputation 6,930
#2 dandyoun
dandyoun
Reputation 4,180
#3 tennisshoes
tennisshoes
Reputation 2,510
View All

Related Models For Sale

Used Chevrolet Silverado 1500
2,290 Great Deals out of 155,163 listings starting at $1,395
Used GMC Sierra 1500
939 Great Deals out of 62,274 listings starting at $1,395
Used Dodge Ram 1500
531 Great Deals out of 12,827 listings starting at $1,995
Used Ford F-250 Super Duty
398 Great Deals out of 45,077 listings starting at $2,000
Used Toyota Tundra
584 Great Deals out of 30,729 listings starting at $2,637
Used Toyota Tacoma
619 Great Deals out of 35,127 listings starting at $2,155
Used Ford Mustang
362 Great Deals out of 44,486 listings starting at $1,000
Used Nissan Titan
223 Great Deals out of 16,972 listings starting at $3,999
Used Ford Explorer
936 Great Deals out of 73,995 listings starting at $750
Used Chevrolet Tahoe
772 Great Deals out of 28,452 listings starting at $1,500
Used Chevrolet Colorado
262 Great Deals out of 19,415 listings starting at $1,995
Used Ford Ranger
203 Great Deals out of 6,719 listings starting at $1,450
Used Jeep Wrangler
392 Great Deals out of 19,081 listings starting at $3,000

Used Cars For Sale

2017 Ford F-150 For Sale
4 Great Deals out of 103,478 listings starting at $18,199
2016 Ford F-150 For Sale
154 Great Deals out of 41,651 listings starting at $16,995
2015 Ford F-150 For Sale
197 Great Deals out of 7,255 listings starting at $17,480
2014 Ford F-150 For Sale
433 Great Deals out of 11,727 listings starting at $10,700