92 explorer running problem

[xlinkinpark2438]

Its kinda a long one but if anyone can help that would be great






I have a 92 explorer and drove it from taylor to newport about 30 min drive and a couple of hours later i filled up on gas and came back to taylor and it ran fine and about an hour after i got back i went out to go somewhere and my truck sounds like it hs a miss and is running rough. soo i took it around the block thinking that it just got carbon build up or something and would just clear up but that did not help at all. i opend the hood and notice that there was gas on the connection from the manifold to the rest of the exhaust (not a perfect connection there) and figured a miss soo i checked all of my plug wires and they are all good. and the plugs were petty black soo i bought all new and that did no difference. soo i tried to narrow doun the problem and ran the engine on just the three cylinders on the passenger side and then on the driver side and noticed that the driver side 3 cylinders ran worse soo i had just those three connected and disconnected them one by one and found that the front cylinder on the driver side is not making any difference when i unplug it and plug it back in. and i am getting spark to the spark plug. and i am getting gas i know because i am getting gas leaking out at the manifold. i was woundering what anybodys thoughts are. and just for the record the truck has 290,000 miles and has been running exelcent for a while now i have driven it from 7oclock in the morning till about midnight doing escorting for manufactured homes a couple of times this year and ran exelcent. and now been using it to drive to and from work which is about 30 minutes away.







Please help

 

[Bwana Bob]

If the plugs were black, but not "oily black", it sounds like its running way too rich. Where exactly are you seeing gas? There is a particular failure mode where the fuel pressure regulator (FPR) fails and causes fuel to be sucked out of the regulator through the vacuum line and into the intake manifold. Unplug the vacuum line that goes from the FPR to the vacuum tree on the manifold and see if gasoline dribbles out of it. If, so, the FPR is faulty. The FPR is relatively easy to replace and they sell for about $75.

Bob

 

[marragtop]

Switch the plug wire of the cylinder that isn't firing correctly with another one and see if the problem follows the wire. If so, replace the wire(s).

 

[xlinkinpark2438]

i am getting spark to and through the plug
i know this because i took the plug out and hooked it to the wire and set it on ground and cranked the motor and it was getting good spark.