i have a 98n expedition 5.4 triton replaced timming tensoiners because it was making so much noise. replaced all the plugs and coil packs now it has a rough idle and can be felt some when on the hiway

10

Asked by samson1997 Aug 17, 2016 at 06:38 PM about the 1998 Ford Expedition 4 Dr Eddie Bauer 4WD SUV

Question type: Maintenance & Repair

did not have rough idle before all the plugs and coil packs and timing tensioners were replaced. took it to ford they say it has low compression on driver side.

7 Answers

65,510

When replacing spark plugs it is very easy to pick up some oily dirt that can get between the gap or the gap can get closed if plug is dropped in spark plug hole. So I would remove plugs on drivers side and take another look at them.

159,075

Is the check engine light on? If so get it scanned for codes at a local auto parts store. What brand were the coils? Genuine Ford - Motorcraft is the best and some of the aftermarket stuff is crap. If a dealer says low compression on the driver's side is it possible that the cam timing is 1 tooth off?

10

Bob no check engine light . it ran good except for the knock from the timing chain . after replacing the chain and coil packs and plugs it now run a rough idle . used the accel super coil packs and motorcraft plugs. engine dose not have any knocks now just rough idle. checked the iac and mafs and the throttle body

1 people found this helpful.
10

also tried pulling each coil pack wire off to see if it would make a difference in the idle and all 4 did make it run a little bit rougher. just cant figure this one out

159,075

If you are sure the issue is on one side of the engine you could put 4 of the original coil packs back in on that side if you still have them. That would be a royal pain in the butt swapping them out. I personally would not have used anything Accel makes on my truck, some have good luck with Accel and others don't. Does it smooth out just above idle?

159,075

Interesting read on coil packs at the link....http://www.f150online.com/forums/v8-engines/257269-accel- super-coils-02-4-6-a.html

159,075

More reading here.....http://www.justanswer.com/ford/5lpy6-ford- mustang-gt-just-replaced-timing-chains-tensioners-chain.html

Your Answer:

Expedition

Looking for a Used Expedition in your area?

CarGurus has 821 nationwide Expedition listings starting at $7,888.

Postal Code:

CarGurus Experts

  • #1
    Larry Sturgis
    Reputation
    5,300
  • #2
    T_S_T
    Reputation
    4,560
  • #3
    Gene Arnett
    Reputation
    2,730
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Chevrolet Tahoe
24 Great Deals out of 911 listings starting at $11,900
Used Chevrolet Suburban
10 Great Deals out of 550 listings starting at $7,500
Used GMC Yukon
16 Great Deals out of 929 listings starting at $1,225
Used Lincoln Navigator
10 Great Deals out of 172 listings starting at $9,869
Used Ford Explorer
86 Great Deals out of 2,065 listings starting at $2,999
Used Ford F-150
321 Great Deals out of 14,968 listings starting at $1,712
Used Cadillac Escalade
21 Great Deals out of 376 listings starting at $6,900
Used Ford F-250 Super Duty
24 Great Deals out of 1,204 listings starting at $7,995

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. Content will be removed if CarGurus becomes aware that it violates our policies.