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  #46  
Old 06-15-2013, 08:35 PM
LilRanger93 LilRanger93 is offline
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Default Re: who all has rough idle in a 3.0?

I've had a rough idle for awhile now, sounds like it's got a cam in it. Got some good info from this thread. The plugs, wires and distributor are fairly new so I'll check the IAC (probably still the original), throttle body and fuel filter.
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93 Ranger XL 3.0 V6
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If want real power you need to Plasti-Dip the entire engine including the valves and bearings, that's good for up to 150 horsepower.

Last edited by LilRanger93; 06-15-2013 at 08:37 PM.
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  #47  
Old 06-21-2013, 06:03 AM
Dezzer Dezzer is offline
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Default Re: who all has rough idle in a 3.0?

I have a similar problem 2003 Ford Ranger 3.0 V6 Auto 185,000 miles. Runs rough as hell all of a sudden then all of a sudden it quits and runs great for 1 - 3 days and then does it again. It does it when its cold sometimes and it does it when it has warmed up as well. Had diagnostic done at dealer no codes at that time. compression ck out ok only thing they noted was a .32 misfire on #3,#5 and a .16 on #6 recommended to change plugs, wires, coil, clean injectors, replace fuel filter, clean Maf and reflash PCM. I have done all of that plus replaced the IAC, TPS, and PCV. Finally the CEL did start coming on and the codes were p0303, p0306 and p0316 (Random misfire in the first 100 rev's.) The truck purrs like a kitten until it just goes to crap out of the blue shakes and lacks power wont idle if I pull over and shut it off and restart it and try to drive through it, it finally after a few miles quits doing it and is back to purring like a kitten. I have spent a solid 2 weeks looking for anything it might be; I cannot hear nor find any vacuum leaks I sprayed water on my new coil and viewed it at night no fire jumping. I have unplugged the three injectors I can reach one at a time no change. Its not over heating no hissing or chirping. Ck'd the booster hose ck the elbow on the PCV I have not had the Cadillac convertor ck yet and I have not replaced the o2 sensors yet or reflashed the PCM those are all next on my list. Anyone at all have any clue I am flat desperate my daughter drives it to college and I don't want her to break down in it. I am almost out of places to look.
Thanks in advance for any help is very appreciated!
Dezzer
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  #48  
Old 06-22-2013, 08:44 AM
GLH GLH is offline
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Default Re: who all has rough idle in a 3.0?

Water in the gas ?
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  #49  
Old 06-22-2013, 09:05 AM
bdillard77 bdillard77 is offline
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My truck idles at about 1000rpms (*knock on wood*)...but that is after having both heads replaced and about $1500 after.
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  #50  
Old 06-22-2013, 09:23 AM
rangerlocal rangerlocal is offline
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Default Re: who all has rough idle in a 3.0?

Dezzer,

If you unplug three injectors and there is no change, then those injectors aren't working properly. That's if I read your post right, correct me if I haven't. I'd start there. Along with basic maintenance; full tune up, plugs, wires, fuel filter, run some B12 through the gas tank, seafoam the engine. O2 sensors will usually trigger a code, but you could be caught in the grey area where they're starting to go south but are still getting exhaust sampling readings (although incorrect) enough to prolong the CEL.

Also, it doesn't sound like a plugged catalytic converter. Usually it bogs under higher RPM ranges with that. Also, I hope it's not a "Cadillac" converter. That's a GM product and is not allowed near our Fords!
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  #51  
Old 06-23-2013, 05:31 AM
Dezzer Dezzer is offline
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Default Re: who all has rough idle in a 3.0?

Yeah I unplugged them one at a time and they seem to be working I mean it started missing on that cylinder but didn't seem any worse than before it got better when I plugged it back in but the original missing didn't get better or worse with each one I couldn't reach the other 3 on the drivers side due to the cam cover or what ever kind of cover it is. I also can hear them clicking when I put my wife's stethoscope up to each one. I ran sea foam through the gas and I ran 1/4 of a pint Reslone engine treatment (I have used many times on other Fords Like my old inline 300 6 on my 84) through the throttle body and the rest in the oil. Yeah I just didn't know what they call that emission part on a Ford I have always hear them called Cadillac converters LOL sorry Ford! Thanks! maybe I need to take a another look at the injectors situation and I was wondering would a fuel pressure problem be plausible to this problem being that it is intermittent? My problem is just that since it doesn't do it all the time its hard to know if I have fixed it till it does it again plus it stops doing it, so Its hard to have someone look at if its not doing it. I hope that sounds right. I have done the whole tune up thing plugs, wires, fuel filter , IAC, TPS ,cleaned the Maf ,throttle body, replaced PCV checked the elbow checked for vacuum leaks looked for shorts of any kind.
Thanks to everyone who posted I appreciate any help!

Like you said I think I will take another look at the injectors since it seems to be on those same cylinders almost every time. Maybe that's a clue that I am missing.

Thanks to all!
Dezzer!
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  #52  
Old 06-23-2013, 06:18 AM
dfpgnm dfpgnm is offline
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Default Re: who all has rough idle in a 3.0?

Quote:
Originally Posted by GLH View Post
Water in the gas ?
^2. Or other crap blocking the fuel pickup. You may need to drop the tank and clean it out. (pull the bed to drop the tank. Way easier than doing it from underneath.)
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  #53  
Old 06-23-2013, 07:12 AM
spitbucket spitbucket is offline
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Default Re: who all has rough idle in a 3.0?

Dezzer, this sounds like a classic case of something plugging the fuel pickup in the gas tank. All it takes is a little piece of crud, paper towel, piece of rag etc. The offending piece floats around until it gets close to the pickup and is sucked into position and stops fuel flow. Afte a while of not running the piece floats loose, only to repeat the process. Purchase a fuel pressure gage, ($40 o so) or borrow one, even better. The gages come with good instructions and are easy to hook up. Check the pressure when the truck is running properly so you know how to hook it up and what it should read. Check the pressure As soon as it is safe to do so when it dies. Low or no pressure isolates the problem to bad fuel pump or plugged pickup. Then you pull the tank and check. Good luck. This type of stuff can drive you crazy.
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  #54  
Old 06-23-2013, 08:37 AM
rangerlocal rangerlocal is offline
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Default Re: who all has rough idle in a 3.0?

That was the next thing I was going to mention. The pickup screen at the pump may be intermittently blocked. But if it was replaced, I would have ASSUMED that who replaced it, cleaned the tank and the screen. But that's not always the case. See if opening your throttle slightly when trying to start the truck helps. If not, probably a fuel issue. You can always disconnect the fuel filter rear line, then prime the pump with a jar handy and see if it sprays out with vigor. If it gurgles, then there's your problem: Isolated to the back part of the fuel system.
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2000 Ranger XL, 2WD, 3.0l, 3.73 rear, 10" rear drum ABS, standard cab, long bed, A/C, 4r44e auto trans w/transgo shift kit, throttle cable mod, air box silencer mod, rear sway bar retrofit, white grill swap, CURT hitch, Westin step bars
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Man wish i had tits, seems like its easier to get a job if you have tits.
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  #55  
Old 06-25-2013, 03:20 PM
Dezzer Dezzer is offline
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Default Re: who all has rough idle in a 3.0?

Ok here it goes! its very humiliating to admit but here is the whole story! First actually the problem was the coil originally with it blowing the codes for misfires on 3 and then 6 and a couple of others I fixed those problems when I changed the plugs, plug wires and then the coil but after all of that it was still blowing a misfire on 3, that's when I replaced the iac and then the tps and the pcv and the fuel filter which I am sure it didn't hurt to replace since the engine had 185,000 miles on it. Here's the kicker I thought to myself its always dropping the 3 cylinder that has to be a clue I went back and cleaned the injectors again while doing this I noticed the top heater hose was leaking at the plastic tee I went to Lowes got a brass tee and hose clamps and fixed it due to the dealer wanted 210.00 I could not believe it I will post pics later of the repair. Anyways so I decided to start all over I took the plug wire off of the number 3 and switched it with number 2 drove it till it blew a code again and it was still on number 3 so it wasn't a bad new plug wire so I decided to pull the plug and see if it had fouled or would give any clue to what was happening in the cylinder and low and behold there was the secret I SCREWED UP BIG TIME the plug was cracked long ways down the porcelain top. While I was elated to find the problem I felt like a complete idiot! After all that it was due to O.H. (Operator Headspace). I replaced the plug and she purrs like a kitten and has not had another episode since (crosses his fingers)(knocks on wood)!
THANK YOU TO ALL I have never had such help from anyone I would asked people at the part store and they would just say hell if I know or you got me or could be anything but you guys poured out with answers that made me feel like if I kept going I would eventually find and fix it.
Respect to You All!
Dezzer Midwest Okie
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  #56  
Old 06-25-2013, 03:43 PM
dfpgnm dfpgnm is offline
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Default Re: who all has rough idle in a 3.0?

I know I've cracked spark plugs. (and broken them completely getting them out) I'm sure others on this forum have too. But if you use the right spark plug wrench with the rubber insert, its not all that easy to do. Another tip, start the plug either by hand or with a piece of hose over the end, not with the socket. Helps reduce the chance of cross-threading.
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  #57  
Old 06-25-2013, 04:22 PM
Dezzer Dezzer is offline
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Default Re: who all has rough idle in a 3.0?

Yeah I should of just went and bought a spark plug wrench that fits it but I just threw a deep barrel on a ratchet and away I went I have learned a valuable lesson slow down and use the right tools for the job and recheck everything if all else fails.
Again thank to you all
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  #58  
Old 06-26-2013, 02:06 PM
rangerlocal rangerlocal is offline
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Default Re: who all has rough idle in a 3.0?

Yep, always start the plug by hand, or with the rubber o-ring socket in your hand to make sure it's not cross threaded. They also don't have to be in there tighter than a flea's ass either, which is against what most people think. That's a sure-fire way to crack a plug, and it will misfire all the time if you do that. Just fixed a buddy's 4.0 with a #4 persistant misfire, after replacing everything he brought it to me. I checked the plug and it was cracked. Start simple, then work your way up.

Glad you got it fixed. These are tough trucks if just basic maintenance is done correctly; they'll run quite well for a long time.
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2000 Ranger XL, 2WD, 3.0l, 3.73 rear, 10" rear drum ABS, standard cab, long bed, A/C, 4r44e auto trans w/transgo shift kit, throttle cable mod, air box silencer mod, rear sway bar retrofit, white grill swap, CURT hitch, Westin step bars
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Originally Posted by writtenaudio View Post
Man wish i had tits, seems like its easier to get a job if you have tits.
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  #59  
Old 06-26-2013, 04:13 PM
dfpgnm dfpgnm is offline
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Default Re: who all has rough idle in a 3.0?

When tightening plugs, think in terms of lb/in, not lb/ft. (specs are 84-180 lb/in, or about 7-10 lb/ft, snug, not tight. One or two fingers on a 3/8 ratchet should do it)

And a little anti-seize will make a big difference when its time to take em out.
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  #60  
Old 08-23-2013, 07:56 AM
NEWisconsin NEWisconsin is offline
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Default Re: who all has rough idle in a 3.0?

I did all the tune up stuff, plugs, wires, MAF cleaning, timing belt/chain... It smoothed it out, but it was not perfect. I started using only 87 octane fuel, it improved a bit more. I replaced my cracked and leaking upon fueling filler hose. Job done. The idle is smooth, the acceleration is very smooth up thru the powerband; where it seemed to have flat spots or lags in power at certain RPMs.
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