Howdy all.. I am hoping someone can help me with a major dilema.. I will give vehicle specs. first

1992 Explorer Eddie Bauer 4 door 4x4

4.0 V6 Auto Trans.
180,000 miles on chassis 80,000 on Engine

Started off as a tuneup, changed plugs and wires then after restarting engine it ran on only 5 cylinders.. thought maybe plugs wires were not on secure.. checked that.. all looked fine.. thought maybe one of the new plugs was deffective.. so installed 6 more new plugs and wires ( I own a 91 explorer aswell and had plugs and wires for it aswell) engine still missed.. thought well maybe its just a coincident and that the engine was just finally tired.. so gave it a compression test and the guage is not very dependable and showed only 60 pounds on one cylinder.. soooo.. got a good used engine from the local wrecking yard out of another 92 explorer.. went through all the hassles of the engine swap put all new seals in the used engine before putting it in.. anyways.. got it all in and everything connected and give it the initial start.. Take a Guess.. its still running on 5 cylinders I have it pinned down to the cylinder in the front on drivers side.. not sure what cylinder number that is at the moment.. but when pulling plug wires off and or injector wires it shows no change when pulling the fuel or spark from that cylinder making it certain only that cylinder is not firing.. I have tested about everything I can think of including pulling parts from my running 91 explorer such as the main computer in the passenger side kick panel.. got a used EDIS6 module from a wrecking yard thinking it was maybe all of a sudden faulty.. checked for spark on the cylinder in question.. has spark.. pulled a injector from the old engine from a cylinder that I know was firing.. checked for voltage pulse on injector wire for the cylinder in question.. checked fuel pressure at rail 40 pounds.. so in theory.. it should be running on 6 cylinders.. it has Fuel, Compression and Ignition.. and both engines cannot be bad on the same cylinder.. as I honestly think the old engine should of been running on 6 yet.. as the guage we used to check compression is faulty.. so with all this said.. what more can I check for? I know its not a fuel issue.. I sprayed small bursts of ether into the intake with it running thinking if it was a lack of fuel on that cylinder it should fire on the ether.. that didnt affect it at all.. ran on 5 cylinders burning the ether.. it has to be an issue with the ignition not firing on the cylinder at the right time.. or???? So if anyone has any kind of clue please clue me in.. Thanks, Shawn

P.S. forgot to mention on the old engine the Fuel Pressure regulator was bad as there was fuel in the vacumn line.. but this is now corrected with the replacement engine..

 

anyone?

 

nevermind.. I figured it out..

 

Well...don't leave us hanging! What was it?????

 

Seems you checked everything I would of. I would of looked into the ignition system a bit more tho. So what was it? I would love to know.

 

It was a "Haynes" repair manual.. firing order is wrong in them books for our explorers.. I took a closer look at my 91 and figured that out cause I have motorcraft wires on that engine yet.. and it has numbers making it alot easier to trace where the wires go..

 

lol I kinda thaught it had something to do with the ignition. That sucks but at least you have an engine you can rebiuld and posibly sell. This is why when doing a tune up you only replace one wire or plug at a time. It's too bad you had to go thru all that tho.

 

it's all fine.. the old engine was getting pretty weak anyways.. and had alot of valvetrain noise. Bad lifters and such I spose.. this engine runs like a top.. lots more power.. so it was all very well worth it.. Get another 100,000 outta the beast see if we can bring her up to 300,000 miles..