why do my engine run rough while driving ,but runs good while idling? also smokes if idles for more than 3 minutes

Asked by Jan 13, 2015 at 10:40 PM about the 1998 Ford Expedition 4 Dr Eddie Bauer 4WD SUV

Question type: Maintenance & Repair

engine runs almost normal while idling,but does have a slight misfire or trimble. When taking off from dead stop everything's normal until transmission shifts into high range. Once into high range, stalls and sputters very bad.  When idling for more than three minutes, heavy white  smoke comes from tailpipe. Checked coolant level , and it was full .

2 Answers

845

White smoke usually steam indicates a blown head gasket. check for bubbles in radiator when warm, and/or milky oil on dipstick (water present).

245

White smoke can also show an overfuel condition with the newer catalyst systems, from the overheating of them, and the resultant water vapor. For sure watch the coolant level, but also check fuel pressure and watch to see that it holds pressure when key is off. As for coolant, look under the oil filler cap, and wipe your finger inside the opening, looking for a whitish yellow milky slime, which point to moisture in crankcase, either leaking coolant, or too many short trips where engine doesn't get fully warmed up. If it has a check engine lamp on, get the codes pulled also.

Your Answer

Add photo

Related Questions

Search Ford Expedition Questions

Ford Expedition Experts

#1 T_S_T
T_S_T
Reputation 1,920
#2 Larry Sturgis
Larry Sturgis
Reputation 1,400
#3 lightGear
lightGear
Reputation 1,030
View All

Related Models For Sale

Used Chevrolet Tahoe
610 Great Deals out of 35,916 listings starting at $1,000
Used Ford Explorer
801 Great Deals out of 62,437 listings starting at $495
Used Chevrolet Suburban
272 Great Deals out of 20,150 listings starting at $1,195
Used Lincoln Navigator
98 Great Deals out of 5,152 listings starting at $1,900
Used Ford F-150
2,204 Great Deals out of 180,758 listings starting at $1,500
Used GMC Yukon
405 Great Deals out of 20,769 listings starting at $1,495
Used Cadillac Escalade
213 Great Deals out of 11,017 listings starting at $2,900
Used Dodge Durango
276 Great Deals out of 20,019 listings starting at $999
Used Ford F-250 Super Duty
334 Great Deals out of 43,175 listings starting at $1,250
Used Toyota 4Runner
233 Great Deals out of 21,034 listings starting at $1,500

Used Cars For Sale

2018 Ford Expedition For Sale
13 listings starting at $50,265
2017 Ford Expedition For Sale
23 Great Deals out of 12,776 listings starting at $29,000
2016 Ford Expedition For Sale
98 Great Deals out of 1,549 listings starting at $25,900
2015 Ford Expedition For Sale
10 Great Deals out of 565 listings starting at $19,995
2014 Ford Expedition For Sale
47 Great Deals out of 774 listings starting at $14,995

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.