Engine misfire

Asked by Mar 14, 2016 at 06:24 AM about the 1990 Ford F-150 STD 4WD SB

Question type: Maintenance & Repair

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

1 Answer

37,955

When the tack jumps around usually a bad ground wire. Check and clean all ground wires. May also have some bad spark plug wires, or a bad connection with the ignition wires. Make sure there are no breaks in the ignition wiring in the insulation for bare wire to be touching ground.

Your Answer

Add photo

Related Questions

  • the vacum hose that goes to the power booster has come lose from behind the end of the engine near the fire wall can some one tell me where it goes and will this make the engine misfire 2 answers

    this is on a f 150 5.4 2006 ford truck I had a useless mechanic put cam phasers on and he left the vacum hose that goes to the power booster off from behind the engine now I have a big misfire and no ...

    2006 Ford F-150 XL SuperCab 4WD

    -

    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

  • Ford F150 knocks and misfires bad all of the sudden 9 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

  • 2003 Ford F-150 bad misfire 2 answers

    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. Noti...

    2003 Ford F-150

    -

    Maintenance & Repair

  • Misfire 2 answers

    I have a 2000 Ford Contour an the check engine light came on ran the code an it came back as misfire on Cylinder 4! I have chance the the plugs an wires an coil packs an I bored out the Catalytic ...

    2000 Ford Contour 4 Dr SE Sedan

    -

    Maintenance & Repair

Search Ford F-150 Questions

Ford F-150 Experts

#1 OJ
OJ
Reputation 6,290
#2 dandyoun
dandyoun
Reputation 3,970
#3 tennisshoes
tennisshoes
Reputation 2,370
View All

Related Models For Sale

Used GMC Sierra 1500
1,084 Great Deals out of 56,547 listings starting at $1,600
Used Ford F-250
3 Great Deals out of 492 listings starting at $1,977
Used Ford Mustang
639 Great Deals out of 36,930 listings starting at $2,800
Used Ford Explorer
1,349 Great Deals out of 70,733 listings starting at $985
Used Ford Ranger
186 Great Deals out of 6,243 listings starting at $1,595

Used Cars For Sale

2017 Ford F-150 For Sale
36,920 listings starting at $17,605
2016 Ford F-150 For Sale
211 Great Deals out of 97,578 listings starting at $17,892
2015 Ford F-150 For Sale
263 Great Deals out of 8,203 listings starting at $18,891
2014 Ford F-150 For Sale
532 Great Deals out of 11,113 listings starting at $9,900
2013 Ford F-150 For Sale
765 Great Deals out of 14,458 listings starting at $7,527