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Old 09-15-2010, 11:55 AM   #1
ronin1865
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Default 2003 Ranger Edge 4.0L Idle problems

I have been having idle problems ever since I changed my sparks plugs about a month ago. Basically, the problem has been random where when I am stopping or turning the truck or as I am changing in and out of a lower gear and low speeds (its 5speed by the way) the idle drops below 500RPM and almost stalls out. I have had it stall out a few times. It normally surges back up to a normal idle position. Now since yesterday it wants to stall out completely at a stop light or as switching the gears at low speed. It drops below 500RPM and was idling all this morning at 500RPM at a stop light. In order to get to work I had to keep my foot on the pedal to keep it running. Any suggestions what it might be? As I am pretty SOL at this point.
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Old 09-17-2010, 10:28 PM   #2
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Ok so I replaced the IAC thinking that might be the cause of my problems. It help some but I still having engine idle problems. Truck rpm drop when stoping /shifting and rpm jumps around when stoped. Any suggestions are greatly appreciated. This is one off those problems that can get expensive quick replacing parts.
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Old 09-17-2010, 10:48 PM   #3
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Did you make sure you used the correct plug? Autozone (if you happened to get them there) list them as the wrong plug.

RPS Thread

Last edited by gearheadjlm; 09-17-2010 at 10:52 PM.
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Old 09-18-2010, 05:36 PM   #4
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I did do that the first time I changed them and it ran like crap. I checked on here and someone had posted something about that. I called the dealership and got the correct part number, and was able to get the correct ones from Advance. I changed the wires too at the same time and got those from as advance as well. Maybe those are the wrong one??? I didn't change the coil pack though.

But maybe I got bad plugs or wires or the coil pack went bad?? Seems like all of this happened around the time I changed my plugs.

I'm going to clean the MAF tonight with some MAF cleaner maybe that will help.
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Old 09-22-2010, 10:20 AM   #5
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so i cleaned the maf this weekend, but didn't make all that big of a difference. so, i'm thinking it might be the tps. has anyone had similar issues? can anyone tell me what their 4.0L idles at?
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Old 09-24-2010, 09:33 PM   #6
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you may have an intake manifold leak, this can cause idle problems as well.
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Old 09-27-2010, 01:08 PM   #7
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i got an 02 ranger edge with the 4.0 its an automatic but i was having the same problems, low idle, wanting to die at a stop and whatnot. i heard a vacum leak and i found that my pcv hose was brittle and leaking. put a new hose on and it fixed the problem. runs like a champ now.
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