Acrytet70

Hey guys whats goinf on. I just recently picked up a 1999 Ford Explorer Sport, its the 4.0 SOHC. The car has a rough idle and the check engine is on, i put it on my reader tool and it said its a misfire in cylinder #3. Is this a common problem? Has anyone had any experience with this, i was wondering if this is common in Fords or if it is an easy fix? Im a Honda guy so this is all new to me! I appreciate the help in advance..

j4k3

Has it had a tune up?

Acrytet70

Just basic stuff, plugs, wires, and fluids.

QUICKVIII

which engine is it? OHC or OHV? Does it run rough at idle? Does it misfire or breakdown when you power brake it? give us some info, thanks..

dallasb84

could be,,,

imrc, egr, maf, o2, sounds like a sensor

TWOFAWTY

+1 on sensor.

Explorer engines seem to require all the electronics to be flawless to run worth a damn. One bad sensor or one loose connector and it'll run like shit. I'd check out the oxygen sensors first, Fords are notorious for that.

Acrytet70

It sounds like a misfire, and the obd reader said it was a misfire in #3. it idles rough but drives good! when you give it some gas it it doesnt stutter or smoke.

elements018

start by checking the condition of the plugs, there you can find out whats the problem

aacjohnc

had a 98 explorer did the same thing its the sensors ... even after i did a tune up it was still misfiring and causing the check engine light to come on..

i had four sensors in mine cause i had duel exhaust . i think you have only three .

aacjohnc

also had a 97 and was misfiring on # 8 cly. if you have a coil pack as well check the connection of the wires cause i bought the cheap shit for wires mad it worse so i returned them and got the good one and that fixed my problem on my 97 explorer. but i would start with the sensors ...