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I have a 1997 Explorer Sport with the 4.0 SOHC engine.
About 2 months ago the engine light came on and the engine started running very rough. 1.Changed the plugs, but no help ! 2.Mechanic did diagnostic and showed #6 injector bad, so we replaced it and engine ran a little bit better, but still rough. 3.Did 2nd diagnostic and showed a vacuum leak and was told by a Ford service tech it was most likely the lower intake manifold and they had a history of problems with it.
We changed it out but made absolutely no difference
Ford tech says he does not know of anytime the upper manifold has gone bad !
When you changed the plugs, did you change the wires as well? What specific code is it throwing? Have you checked all the vacuum lines at the vacuum tree... drivers side by firewall?
I don't know the codes, but my mechanic said it was the # 6 injector the first time and the second it just showed a vacuum leak.
No exterior leaks can be found.
Sorry I don't have more specifics !
Finally found the problem with this 97 XPL !
Somebody put Sugar in the gas tank which caused erroneous diagnostic reads which caused me to spend an unnecessary $500.00 on it.
The Good news is, I have full coverage insurance and they are going to pay for everything minus my 250 deductible.
The bill is up to $2,500 already, so it may be totaled shortly.
To bad cause I just put brand new Firestone tires on it !!