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Old 08-15-2018, 09:45 PM
Missouribillhilly Missouribillhilly is offline
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Join Date: Aug 2018
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Default Hello everyone! long time reader, first time poster.

Im having a stall issue with my 2003 4.0 sohc ranger. Idles rough and dies sometimes at idle. It will also buck or jerk once in a while. I have new plugs, wires, coil, iac, tps and intake gaskets. Im wondering if i need a custom tune since i have headers. I dont think thats it because it ran like a badturd when i first put all the mods on and a month later im having this issue. Any suggestions i will appreciate. Also, im a newbie here so no cyber bullying. Lol
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2003 4◊4 4.0 SOHC XLT, Cold air intake, headers, cat-back exhaust, SCT X4, 265/75/R16s, 2 inch torsion lift, fastest V6 in the state........maybe
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Old 08-16-2018, 04:31 AM
skirbykat skirbykat is offline
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Default Re: Hello everyone! long time reader, first time poster.

How's the air filter? Also try cleaning the mass air sensor. Known to cure many instabilities.

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Old 08-16-2018, 05:24 AM
Missouribillhilly Missouribillhilly is offline
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Default Re: Hello everyone! long time reader, first time poster.

Air filter is brand new and i have cleaned and changed the maf sensor. Looked for vacuum leaks. The diagram on the truck under the hood is not that great it doesnt show all the vacuum lines. Im sure it is something simple. I cant wait to figure it out. Thank you for the reply.
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2003 4◊4 4.0 SOHC XLT, Cold air intake, headers, cat-back exhaust, SCT X4, 265/75/R16s, 2 inch torsion lift, fastest V6 in the state........maybe
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Old 08-16-2018, 05:45 AM
Dirtman Dirtman is offline
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Default Re: Hello everyone! long time reader, first time poster.

If it's only happening at idle and still drives fine check your IAC valve. A quick but not full test is to simply unplug it while the truck is running. If it gets worse or stalls completely then the IAC is still functioning somewhat. If there's no change at all then the valve is stuck closed or clogged. Still easy enough to just pop it off and scrub it with carb cleaner and make sure the valve moves freely.

Last edited by Dirtman; 08-16-2018 at 05:48 AM.
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Old 08-16-2018, 07:20 AM
Missouribillhilly Missouribillhilly is offline
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Default Re: Hello everyone! long time reader, first time poster.

Thanks for the help, but i have tried that and it is working. Im thinking vacuum line or maybe radio capacitor. I just checked it cause my radio had interfence and the wire was not seated in the plug very well. I fixed it and in 30 minutes it will be ready to hook up and check.
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2003 4◊4 4.0 SOHC XLT, Cold air intake, headers, cat-back exhaust, SCT X4, 265/75/R16s, 2 inch torsion lift, fastest V6 in the state........maybe
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Old 08-18-2018, 06:31 PM
Missouribillhilly Missouribillhilly is offline
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Default Re: Hello everyone! long time reader, first time poster.

Plug wires was the problem. Only buy motorcraft plugs and plug wires. I still have a small hesitation at idle, but the truck is running great other than that. Thanks for all the suggestions i appreciate it.
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