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  #1  
Old 10-08-2010, 06:29 PM
Fordzilla80 Fordzilla80 is offline
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Default 3.0 Idle problems

Hey guys, normally I use the search to figure things, but on three different sites I've seen so many different causes for my problems that I feel I need to post my own thread on it.

I have a 2003 Ranger with a 3.0 and Automatic. It has 43,500 miles on it. It seems to run rough when the truck is idling. Not really bad, but it's noticeable. My plug wires still say Motorcraft on them, so i'm wondering how long it's been since the last plug change was done. A plug and plug wire change is definitely in the future, just for the sake of assurance. It seems to idle roughest at stop lights. I've watched it for a few days, and it seems to run around 500-750 rpms at full stop. Sometimes it gets a little iffy so I give it a little rev to keep it at 1K. What would be the normal RPM range at idle for the 3.0? Also, does anybody have any other ideas on what else it could be like dirty MAF or the IAC deal?

Another problem i'm having that might be related is when I put the truck in reverse. On a few occasions the truck has dropped down to about 300 RPMs and on two occasions it quit. It seems to only happen when I get on the gas or brake in reverse. If I let the truck coast backwards under it's own power, it doesn't give me a problem. Is this related to my idle problem too, or is it an entirely different problem?

Other than that, the truck runs great, and I really love it. I appreciate any help you guys can give that'll get my girl running like new. Thanks in advance!


Shaun
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  #2  
Old 10-08-2010, 06:49 PM
DrIftKi7Vg DrIftKi7Vg is offline
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Default Re: 3.0 Idle problems

Hey, I have an 02 Ranger Edge so I know what your dealing with. Spark plugs and wires are a must. Do you feel any vibration? If so change the plugs and wires. At your mileage it's best to go ahead a change them. Also I would do all of the necessary cleaning such as the IAC, MAF and the throttle body as well. You can use a throttle body and MAF cleaner such as CRC I think it's called? Go to Autozone or somewhere close to you and ask and they will know what your talking about. Lastly, I would use some Seafoam. Seafoam cleans up deposits in your engine and what not and would make everything run smoother. I have done that and a spark plug and wire change and it runs better than before! Also you should consider doing the throttle cable mod as well. Here are the links for everything. Hoped this helped you out.

http://www.fordrangerforum.com/engin...r-control.html
http://www.fordrangerforum.com/engin...ow-sensor.html
http://www.fordrangerforum.com/engin...ttle-body.html
http://www.fordrangerforum.com/engin...cable-mod.html
http://www.amazon.com/gp/product/images/B000M8PYO2/ref=dp_image_0?ie=UTF8&n=15684181&s=automotive
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  #3  
Old 10-08-2010, 08:41 PM
Fordzilla80 Fordzilla80 is offline
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Default Re: 3.0 Idle problems

Thanks for the info man.

I just went to Walgreens, and it was really bad. It almost stalled 3 times on the way home, and I actually got it to stall when I was in the driveway. It seemed to die when I had the truck in reverse, and the brake applied, and the same goes for when it was in drive. It really upset mom, so she already wants to get rid of it. I need to tackle that list this weekend and get it fixed.
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  #4  
Old 10-08-2010, 10:27 PM
Fordzilla80 Fordzilla80 is offline
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Default Re: 3.0 Idle problems

Quick question guys, will there be any effects to removing the battery cable? What i'm worried about is the computer learning the operating strategies again. Is there something I can do to keep the strategies so the computer doesn't have to relearn them? If not, is there a certain sequence of things I should do to help it learn?
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  #5  
Old 10-08-2010, 10:58 PM
Coleosis Coleosis is offline
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Default Re: 3.0 Idle problems

Quote:
Originally Posted by Fordzilla80 View Post
Quick question guys, will there be any effects to removing the battery cable? What i'm worried about is the computer learning the operating strategies again. Is there something I can do to keep the strategies so the computer doesn't have to relearn them? If not, is there a certain sequence of things I should do to help it learn?
Its ok to unhook the battery...
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Old 10-08-2010, 11:14 PM
DrIftKi7Vg DrIftKi7Vg is offline
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Default Re: 3.0 Idle problems

Quote:
Originally Posted by Fordzilla80 View Post
Thanks for the info man.

I just went to Walgreens, and it was really bad. It almost stalled 3 times on the way home, and I actually got it to stall when I was in the driveway. It seemed to die when I had the truck in reverse, and the brake applied, and the same goes for when it was in drive. It really upset mom, so she already wants to get rid of it. I need to tackle that list this weekend and get it fixed.
Definitely man. Don't get rid of it! If what I told you to do doesn't work, go to a mechanic and get it fixed there. Good luck man.
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2002 Ford Ranger Edge Flex Fuel 2wd
LED Crazy!
Complete Pioneer Audio setup
5000k HID Projector retrofit and 3000k Fogs
Super Turbo Dynomax Exhaust
Mustang Dome Light Mod - Fog Light Mod
Achilles Desert Hawk 255/45/20 with 20'' rims

Much more!
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  #7  
Old 10-09-2010, 06:03 AM
Fordzilla80 Fordzilla80 is offline
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Default Re: 3.0 Idle problems

Quote:
Originally Posted by DrIftKi7Vg View Post
Definitely man. Don't get rid of it! If what I told you to do doesn't work, go to a mechanic and get it fixed there. Good luck man.
Oh I know man. I love the truck, it's just one probably small thing that hinders the way it runs. I keep reminding mom about my last Ranger because it had 189K on a 2.5 and 4R44E that pulled horse trailers every week. If that one made it through that, this one can too.

When I get everything done later today i'll post back some results.
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  #8  
Old 10-09-2010, 07:43 AM
Fordzilla80 Fordzilla80 is offline
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Default Re: 3.0 Idle problems

Okay guys, I got the IAC cleaned. It was pretty nasty, and had carbon build up on the little plunger thing, and in the chambers. Cleaned it all up, and reinstalled. I went to go do the MAF sensor next, and when I look at the torx screws, they have a little dowel or something in the center. My torx set won't work on that. Is there a special torx set I need?

Well, cleaning the IAC didn't work. Doesn't mean it's still not bad though. Could the MAF sensor being causing it to run like crap?

Last edited by Fordzilla80; 10-09-2010 at 08:06 AM.
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  #9  
Old 10-09-2010, 08:10 AM
sgtsandman sgtsandman is offline
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Default Re: 3.0 Idle problems

The MAF could be it. I think Sears sells Torx tools with the centers drilled out for the screws. I need to get a set myself...

Found a few sets at Harbor Freight: http://www.harborfreight.com/catalog...per+proof+torx
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Last edited by sgtsandman; 10-09-2010 at 08:18 AM.
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  #10  
Old 10-09-2010, 09:53 AM
Fordzilla80 Fordzilla80 is offline
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Default Re: 3.0 Idle problems

Ahh, Tamper Resistant, that's the key.

Anyways, Mom called up the place we bought it from, and they told me to take the truck to one of their mechanics and they will get it taken care of. So we'll see if someone else can figure it out. I have finals Monday, so this couldn't come at a worse time.

Last edited by Fordzilla80; 10-09-2010 at 07:02 PM.
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  #11  
Old 10-09-2010, 07:07 PM
Fordzilla80 Fordzilla80 is offline
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Default Re: 3.0 Idle problems

Okay guys, I hate it when people don't post an update with their problems, because you don't know if what they did worked or not.

So, here's my current update. I took it to the Stealership's mechanic, and he turned out to be a really nice guy. All he had time to do was clean the throttle body and clean the IAC. He tried the IAC, but couldn't get anything out of it because I had already cleaned it.lol. Anyways, he also pulled the Throttle Body and cleaned it. Well, I took it home, and all the way home, and all the way to Taco Bell, she has not dipped below 500 RPM, even in the Taco Bell drive thru. She still idles rough, but I didn't have to manually hold the idle at all. I have a 20 minute drive to school on Monday, so we'll see how she does then. I still have to take it back to the mechanic and run one of them fancy scanners on her to make sure there's nothing else in there that the Computer isn't telling me. I'll post back up if it tells me anything.

Thanks for all the help guys!
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  #12  
Old 10-10-2010, 09:53 PM
thejoebob thejoebob is offline
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Default Re: 3.0 Idle problems

I had the same issue in my truck, it could be something as simple as your EGR valve. I replaced mine and it worked like a dream!
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  #13  
Old 10-11-2010, 08:48 AM
Fordzilla80 Fordzilla80 is offline
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Default Re: 3.0 Idle problems

I'm hooking her up to a really good scanner today, so we'll see what that tells me.

She did stall on me last night shifting from park to drive, but she didn't stall yet today, so there's still something funny going on. She isn't dying near as much, but she still runs rough enough to worry me. Luckily, she's been keeping 750 RPM at stoplights, so I'm not having to hold the throttle and brake at the same time.
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  #14  
Old 10-11-2010, 01:47 PM
snipes040 snipes040 is offline
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Question Re: 3.0 Idle problems

I also have idling problems as well but not as severe as yours.. it has never stalled but when you listen to it running at a stop light, the engine sound revs up and down randomly and stays at about 900 rpm's. Is this normal? I have checked the IAC and it was clean and no buildup. I haven't checked the spark plugs or MAC but I am hoping to get the spark plugs replaced soon.

any suggestions?
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  #15  
Old 10-11-2010, 01:54 PM
DrIftKi7Vg DrIftKi7Vg is offline
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Default Re: 3.0 Idle problems

Yeah fix the spark plugs if you haven't changed them yet. The revving up and down has happened to me but I think it's normal. If your not completely stalling out or you don't have bad vibration, then you should be good. If you do have a little of a rough idling and some odd vibration, I would start by changing the plugs and wires. That's what did it on mine and now it runs real smooth.
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2002 Ford Ranger Edge Flex Fuel 2wd
LED Crazy!
Complete Pioneer Audio setup
5000k HID Projector retrofit and 3000k Fogs
Super Turbo Dynomax Exhaust
Mustang Dome Light Mod - Fog Light Mod
Achilles Desert Hawk 255/45/20 with 20'' rims

Much more!
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