I just put a used motor in my ranger. At first everything was fine then a couple days later it started to have a miss while idling. Took it to the mechanic we changed the idle censor the intake o2 censor. Nothing improving it to I changed the spark plugs and wires and fuel filter. It just seems to be getting worse by having a slight delay when hitting the gas. We tested the coil pack and hooked it to his computer it showed a miss on cylinder 5 and sometimes on cylinder 6. But it didn't say anything else. So I tried seafoam still didn't help its still has a miss when idleing but its lost so much power can't get above 40 barely makes it up hills and r.p.ms won't get above 2500

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2001ford ranger edge--xlt supercab
4x4 4.0 sohc

Why did you change the engine in the first place? Did you check compression and fuel pressure?

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It had a blown headgasket. Plus some other problems so I changed the motor and yes the compression was checked everything was fine. No I didn't have the fuel pressure checked wouldn't that cause a miss on all cylinders and lower r.p.m when idling which it doesn't have?

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2001ford ranger edge--xlt supercab
4x4 4.0 sohc

Why not check for a clogged exhaust. You can do this by pulling the o2 out before the cats and see if it runs better.

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1999 Ranger 4.0 and extreme Snap-on tool fetish

Double check your spark plug wires make sure there in the right spots and that two arnt reversed i think some of the OEM coil packs have the cylinders marked on top of the coil pack. Make sure your using autolite/motorcraft spark plugs. How much of your old engine is still in the truck? Next i would think is vac leaks. Can you post up exact codes that its throwing?

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2003 XLT FX4 Level II
Painted skid plate, Pioneer double din, painted radio bezel/door handles, headlight mod, throttle cable mod, Gibson cat back, afe cold air, 06+ fender badges, Remote start, 06+ mirrors,06+corners, 35W DDM HIDs 4500k head and fog lights,polished alcoas

I had the same problem, 2002 XL 3.0 v6. Misfire on 5 and/or 6, fell on its face above 2500rpm, no power, could barely get above 30mph. After checking compression, spark, fuel pressure, changing fuel filter, new plugs, coil pack good, wires right, I checked vacuum. No vacuum, but no leaks, so why wasn't it making vacuum? The 2 pre-cats on the y-pipe directly off the lower exhaust were completely plugged. So, everything was getting pushed back in that was getting expelled! Now, to check this do it the smart way, not the PITA way I did, cuz your main cats on the straight pipe right before the muffler might actually be the plug (if you have 4 cats like my 2002). Pull that straight pipe 1st so the exhaust is coming out the y-pipe and test drive around the block. If you're still falling apart, now pull the y-pipe so the exhaust is coming right out the engine and test drive. Do it in this order, because if you do like me and pull the y-pipe 1st, you don't know if the 2 rear cats are actually the problem. Yes, deaf old ladies in the next county will hear you coming, but you're only testing. I ran like a bat out of hell after doing this, discovering the 1st two cats were plugged. Replace them if your local regulations require (around $400), or bust them out if not like me (I still have the 2 rear main cats so no CIL lights up). If you bust them out, you'll have to cut the pipe to get to 1 of them, and make sure you get everything out. Don't flame me for pulling 2 out, I still have the 2 main cats so I'm not killing the planet at a prodigious rate Make sure to re-install and connect all the o2 sensors as well! Also, revving it in N or P in driveway to check may not work if your '01, like my '02, has a rpm limiter on it that will cause it to fall on its face at 3000rpm, you must actually drive it.

There's only a couple parts off the old motor, altinator, air compressor, power steering pump, it came with all censor exspect for those on the parts mentioned. I checked the wires again their in the right spot, and I'm using autolite platinium. I can't remember the codes it shown is it safe to drive it like this so I can get it read again? I've had it parked trying to figure it out.

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2001ford ranger edge--xlt supercab
4x4 4.0 sohc

I ask because it ran good for a bit after putting the different engine in which led me to think something still on the truck or something off the old motor was causing your issue. The gentleman above brings up a good item to check(cats) because that's something off the truck from before the engine that could cause issues like this, which also could contribute to blowing the other engine. I cant say if you should drive it like this because its unknown whats causing the issue I would think you could start it and it will prob throw codes thus you can get a code reader then and get the codes. If your positive the spark plugs and coil are good I would be checking for some vac leaks using carb cleaner or something around the engine bay while its running to at least rule that out.

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2003 XLT FX4 Level II
Painted skid plate, Pioneer double din, painted radio bezel/door handles, headlight mod, throttle cable mod, Gibson cat back, afe cold air, 06+ fender badges, Remote start, 06+ mirrors,06+corners, 35W DDM HIDs 4500k head and fog lights,polished alcoas

I disconnected the exhaust pipe off at the y pipe it still had the problem. So I took it to orielys and had them the codes read it showed p1409 and p1401 which are the differential pressure feedback circuit high input, and vacuum regulator solenoid circuit. The problem now is finding them can anybody help. me and the orielys guy look for like an hour and couldn't find them. We found 1 similiar but it didn't match the one on the computer.

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2001ford ranger edge--xlt supercab
4x4 4.0 sohc

http://engine-codes.com/uploads/ford/04-11-1.pdf
Might help

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2003 XLT FX4 Level II
Painted skid plate, Pioneer double din, painted radio bezel/door handles, headlight mod, throttle cable mod, Gibson cat back, afe cold air, 06+ fender badges, Remote start, 06+ mirrors,06+corners, 35W DDM HIDs 4500k head and fog lights,polished alcoas

Correct protocol for repair is to fix the start with the lowest code # and work up. But........I hadn't seen that p1409 before so I took a quick look and..........it reads, but with a ? mark and I don't know why, but, "EGR Vacuum Regulator circuit malfunction". If I were you and knowing what can happen when the EGR opens too much or at the wrong time, I'd look into this, learn/verify that meaning of the code, then see how to apply this information to curing that code. Then again, I'm a bit confused, first you had misfire codes and severe power loss, and now these codes and I don't know about the power loss. So I'm not really sure where things are at right now.

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2004 Ranger FX4 Level II, 5R55E, Sonic Blue Pearl

Proudly JAP/RICE free since March 2000

When I had it checked the first time it just had a misfire when idling so I took it to the mechanic who put the motor in. At the time it wasn't showing any codes he just had a computer that could tell me which cylinder was misfiring. So we switch a couple censors wires/plugs and fuel filter. About a week later the day after i tried seafoam (put it in the gas tank, and the amount the can said) I went out and started it and right of the bat it was having the problems I described which tripped the light. So I posted it on here for suggestions. The mechanic seems to think these censors could be the problem taking it to him tomorrow so ill keep you posted.

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2001ford ranger edge--xlt supercab
4x4 4.0 sohc