knocking sound

Asked by Dec 30, 2016 at 02:31 PM about the 1999 Ford Expedition 4 Dr XLT SUV

Question type: Maintenance & Repair

I have a 99 Ford Expedition 4.6 change
spark plug wires and plugs now my engine is
knocking

2 Answers

24,105

Make sure you use dielectric / bulb grease on both ends of spark plug boot ends to stop arcing. Make the plug wires are in-fact in the correct position and fully seated on the plugs and coil pack. Make sure all plugs are still gapped the correct gap, may have moved while installing or not gapped correct at all. Make sure nothing came unconnected like crank sensor or also check knock sensor connection and its working correctly. Make sure all plugs are good using a tester or voltmeter, and same for wires, new does not mean always good not with todays quality control which is no quality control.

1 people found this helpful.
24,105

Make sure wires are not touching/arcing.

Your Answer:

Ford Expedition Experts

  • #1
    T_S_T
    Reputation
    2,370
  • #2
    Larry Sturgis
    Reputation
    1,710
  • #3
    COMETGUY61
    Reputation
    850
View All

Related Models For Sale

Used Chevrolet Tahoe
18 Great Deals out of 896 listings starting at $6,999
Used Ford Explorer
22 Great Deals out of 1,817 listings starting at $4,490
Used Chevrolet Suburban
10 Great Deals out of 546 listings starting at $9,995
Used Lincoln Navigator
3 Great Deals out of 97 listings starting at $4,995
Used Ford F-150
122 Great Deals out of 11,236 listings starting at $369
Used GMC Yukon
14 Great Deals out of 1,128 listings starting at $3,995
Used GMC Yukon XL
12 Great Deals out of 670 listings starting at $5,995
Used Cadillac Escalade
22 Great Deals out of 616 listings starting at $2,500
Used Ford Excursion
3 listings starting at $11,000
Used Dodge Durango
36 Great Deals out of 1,111 listings starting at $4,890
Used Ford F-250 Super Duty
14 Great Deals out of 866 listings starting at $5,995
Used Toyota 4Runner
18 Great Deals out of 532 listings starting at $4,500

Used Cars For Sale

2018 Ford Expedition For Sale
97 listings starting at $56,239
2017 Ford Expedition For Sale
7 Great Deals out of 156 listings starting at $33,400
2016 Ford Expedition For Sale
3 Great Deals out of 33 listings starting at $29,580
2015 Ford Expedition For Sale
3 Great Deals out of 23 listings starting at $28,977
2014 Ford Expedition For Sale
19 listings starting at $22,900

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.