I have a 2002 F-150, 4.2 V6. It has erratic idle when stopping at lights and stop signs. I have replaced )2 sensors, IAC, TPS, plugs and wires and cannot rectify the problem.


Asked by Nov 16, 2015 at 09:28 PM about the 2002 Ford F-150

Question type: Maintenance & Repair

replaced IAC, TPS, plugs/ wires and coil pack. Truck still suffers from erratic
idle. Also replaced all 4 02 sensors.

2 Answers


Sound like you need to check all your vacume hose,s and your intake gasket for leaks,


Especially the PCV valve and elbow, the elbow connecting the PCV valve the the underside of the throttle body often become badly deteriorated and cause a vacuum leak with symptoms like yours.

Your Answer

Add photo

Related Questions

  • if your truck cranks but will not start, what would be the problem? 97 answers

    STARTING PROBLEM I have a 2000 ford f150 5.4L the truck cranks but will not start some times. if i spray starter fliud into the booster in will start up. but other times the truck will start then just...

    2000 Ford F-150 Lariat Extended Cab SB


    Maintenance & Repair

  • Turns over will not start ford f150 v6 2002 1 answer

    I replaced the crank sensor a few months ago when it was running rough and it fixed the problem, shortly after I hit a big puddle and I'm assuming that triggered it to go out again because it imm...

    2002 Ford F-150


    Maintenance & Repair

  • my 1997 ford f150 turns off when im on a stop light .. what could be the problem??? 1 answer

    my f150 turns off when im stopped at a stop light.. whta could be the problem??

    1997 Ford F-150 XLT Extended Cab Stepside SB


    Maintenance & Repair

  • power problem 11 answers

    I have a 300 straight 6 it fires up and runs but there is power loss when going up hills and while driving I replaced the fuel pumps the filters and most of the sensors idk what else could be ...

    1989 Ford F-150 S Standard Cab SB


    Maintenance & Repair

  • why is my idle surging? i think its the iac 4 answers

    my idle is surging after the car warms all the way up. it surges from 1000 to 1500 and its really annoying. i think the idle air control valve needs cleaned or i need an o2 sensor! IDK ANYTHING about ...

    Ford Probe


    Maintenance & Repair

Search Ford F-150 Questions

Ford F-150 Experts

#1 OJ
Reputation 6,020
#2 dandyoun
Reputation 3,900
#3 tennisshoes
Reputation 2,300
View All

Related Models For Sale

Used Chevrolet Silverado 1500"
2,445 Great Deals out of 144,778 listings starting at $1,995
Used GMC Sierra 1500"
1,028 Great Deals out of 56,923 listings starting at $2,300
Used Dodge Ram 1500"
522 Great Deals out of 13,739 listings starting at $995
Used Ford F-250 Super Duty"
444 Great Deals out of 42,988 listings starting at $2,250
Used Toyota Tundra"
614 Great Deals out of 26,773 listings starting at $2,500
Used Toyota Tacoma"
623 Great Deals out of 30,504 listings starting at $2,850
Used Ford Mustang"
731 Great Deals out of 41,065 listings starting at $900
Used Ford Explorer"
1,363 Great Deals out of 71,754 listings starting at $300
Used Ford Ranger"
262 Great Deals out of 7,708 listings starting at $988
Used Chevrolet Tahoe"
1,076 Great Deals out of 36,075 listings starting at $1,700
Used Nissan Frontier"
430 Great Deals out of 20,762 listings starting at $2,500

Used Cars For Sale

2017 Ford F-150 For Sale
8,164 listings starting at $17,015
2016 Ford F-150 For Sale
151 Great Deals out of 136,858 listings starting at $16,985
2015 Ford F-150 For Sale
236 Great Deals out of 8,869 listings starting at $17,958
2014 Ford F-150 For Sale
499 Great Deals out of 10,880 listings starting at $10,450
2013 Ford F-150 For Sale
725 Great Deals out of 14,734 listings starting at $7,727