Hi guys, I have searched this forum and googled others in hopes of fixing my problem...I have a 2000 Ford Ranger with exactly 149,000 miles on it that I haven't had any problems with since I bought it last year. The previous owner bought it new and took unbelievably good care of it. This is the first problem I have had with it...
Last week, I ran it very low on gas as I couldn't make it to a station in time (I know, stupid). I filled it up, drove a few miles, and the check engine light came on and it ran a little rough. I thought maybe I had sucked some crud from the bottom of the tank, so I put some injector cleaner/gunk stuff in it from Autozone (1 bottle)
Problem didn't go away, and I had the codes read the next day which showed 302 and 402- misfire in 2nd cylinder and EGR valve problem. I checked the EGR valve by hooking up a vacuum pump to it and blocking off the hose that was connected to it, and pumped pressure into the EGR valve, which made the truck idle rough. From what I have read, this means my EGR valve is okay. Next, I checked my PCV valve by shaking it and the ball bearing inside was not frozen. Next, I checked my IAC valve by removing it and cleaning it out with carb cleaner and it also had 34-35 volts going through it on my multimeter. Next, I replaced my plugs and wires, and it ran worse. I found no spark going to the #2 cyl. from the 2nd coil (one in back), so I replaced that coil with a brand new one. It ran A LOT better and my light went off after leaving the battery unhooked for about 3 hours.
Next morning: started up fine, very slight misfire but nothing like before. Once the truck warmed up, it ran well and I had no problems all day. I thought my problems were over.
Today: hard to start, very rough idle, by the time I went one block my check engine light was flashing and stayed on all the way to school (about 52 miles on the fwy). Truck ran rough and was hesitant until I hit about 45-50 mph, and was rough at every stoplight while idling. I unhooked the battery for about 2 hours while in class, light went off.
Just now: drove the truck about 10 miles after it started and idled very rough again, light hasn't come back on yet (but I'm sure it will), and after about 10 miles, it ran much smoother but still has a noticeable misfire and rough idle. Smooth while driving, though. (seemed like once it warmed up, the misfire was less apparent?)
Sorry for my novel here guys, but I'm at a loss as to what it could be. I can't afford a mechanic unless I absolutely have to take it to one, and I would like to pinpoint this myself anyway so I know how to fix my own truck.
I have a new fuel filter I plan to install, and I still need to check my O2 sensor, but I wanted to see if you guys could stear me in the right direction for now...
I appreciate any help, and thanks in advance!