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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 02-15-2012
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Truck is acting up...Thoughts?

Tonight as I was heading home from the gym, everything was fine until I got up to 45-50 mph and the truck just struggled to get up to speeds higher than that. In that past year I've replaced my spark plugs, done a full seafoam treatment(oil, gas, manifold), replaced upper and lower intake gaskets, as well as valve cover gaskets and Oil Filter Housing gaskets. It idles normal, gauges are where they should be.

I'm thinking it could possibly be a bad TPS? Any other thoughts? Maybe Transmission related? Cracked heads came to mind but I would think the idle would be terrible for that to be.

Edit: Also to add in, I cleaned my MAF and TB just a couple months ago, if that helps at all.

Last edited by cchsbuzz19; 02-15-2012 at 10:36 PM.
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Old 02-15-2012
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A few things to clean come to mind.
Idle Air Control
Mass Air Flow
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Old 02-15-2012
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Originally Posted by StxDangerRanger View Post
A few things to clean come to mind.
Idle Air Control
Mass Air Flow
I will def. keep in mind the MAF. As far as the IAC, I have replaced that but that was back in late 2007. I guess that could be going bad by now. Also I do not have a CEL. But it just happened tonight and I took it right home so maybe tomorrow when I drive it will throw one so I can get a better idea as to what it might be. Thanks Alex.
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Old 02-15-2012
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What about your fuel filter.
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Old 02-15-2012
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What about your fuel filter.
Fuel Pump and Fuel Filter are also new as of 2011. I spent ALOT of money on the truck last year haha.
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Old 02-16-2012
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Originally Posted by cchsbuzz19 View Post
I will def. keep in mind the MAF. As far as the IAC, I have replaced that but that was back in late 2007. I guess that could be going bad by now. Also I do not have a CEL. But it just happened tonight and I took it right home so maybe tomorrow when I drive it will throw one so I can get a better idea as to what it might be. Thanks Alex.
Just because its new doesn't mean it won't get dirty.
just get a can of MAF cleaner and spray the inside of the IAC out and re-install it. It usually won't throw a CEL, your truck will just run like crap.
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Old 02-16-2012
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Im thinking TPS as well if all other stuff is newish.
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Old 02-16-2012
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Originally Posted by StxDangerRanger View Post
Just because its new doesn't mean it won't get dirty.
just get a can of MAF cleaner and spray the inside of the IAC out and re-install it. It usually won't throw a CEL, your truck will just run like crap.
If it isn't running rough I guess it wouldn't hurt to still clean the IAC?

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Im thinking TPS as well if all other stuff is newish.
I saw that you replaced yours Scott when I was searching r-f. Did you have the same kind of issue? Struggles to get up to speed? Bad gas mileage? I've always had pretty bad gas mileage so replacing it couldn't hurt. There right about the bolts, darn things are on there stupid tight Haha.
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Old 02-16-2012
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If it isn't running rough I guess it wouldn't hurt to still clean the IAC?



I saw that you replaced yours Scott when I was searching r-f. Did you have the same kind of issue? Struggles to get up to speed? Bad gas mileage? I've always had pretty bad gas mileage so replacing it couldn't hurt. There right about the bolts, darn things are on there stupid tight Haha.
They never really run super rough when the IAC is dirty, The telltale if you will, is in the Idle speed.
But no, it doesn't hurt to clean it. I clean mine around once or twice a year.
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Old 02-16-2012
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Originally Posted by StxDangerRanger View Post
They never really run super rough when the IAC is dirty, The telltale if you will, is in the Idle speed.
But no, it doesn't hurt to clean it. I clean mine around once or twice a year.
mine was running fine and then just didnt. wouldnt run at all. but the symptoms that you are talking about sounds like the engine doesnt know where the throttle is if it idles fine and all. plus its only like $20 to replace
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Old 02-16-2012
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I doesn't seem as bad today, it got up to 55 just fine but it still seems a little sluggish though. Went to autozone to use there volt meter. I bought a new TPS and I'm going to replace it anyway since it couldn't hurt.

Decided to make a vid ha, lmk

Next I'm going to clean the IAC and see what that does.
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Old 02-16-2012
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What is a good brand to go with for a new coil? Stock, autozone special, screamn SeaMonkey. What are the differences?


Edit: screamin demon* where did SeaMonkey come from??
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Old 02-16-2012
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LOl at the seamonkey! hahaha. Most people get the oem coils, I might check out a junkyard see if I can find one for cheap with low miles. Idk if you can buy screamin demons for our rangers anymore, i thought that site closed down. Correct me if I'm wrong please.

Anyone heard anything about Delphi ignition coils?

EDIT- Just so i dont completely highjack, OP: Have you tried testing the coil pack? A failing coilpack can make your truck run like ****, especially at higher rpms.

Last edited by paganwars; 02-16-2012 at 03:49 PM.
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Old 02-16-2012
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No, I never even thought of the Coil pack. Wouldn't a bad coil pack lead to little to no spark to 1 or more the cylinders causing the engine to run rough at idle? Or would it still run smooth at idle? It is something I may just replace just to eliminate that being potential issue. I'm just confused as to why the truck is running normal at idle but sluggish at higher speeds. I haven't gotten to cleaning the MAF sensor yet. Just got home from work.
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Old 02-16-2012
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Could your cats be plugged? I can't think that seafoam could be good for them.
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Old 02-16-2012
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I deleted my last 2 cats, but the first 2 could be which would really stink. I think right now I'm going to replace the TPS, IAC and the coil pack just to eliminate those from the list. I just cleaned the IAC but I'm pretty sure its just time to replace it because it was really gunked up and now its whining a little bit like it did when I replaced it the first time.
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Old 02-16-2012
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I've had the same IAC in my truck since '98. (i found the receipt in the glovebox)
if you keep it clean it'll be ok.
You'd know if the Cat's were clogged. They'd be glowing red and your gas milage would be super terrible.
I don't think a bad coil pack is to blame either, If a coil was bad, it would act up at all speeds and all times.
normally a fine idle and a mis or stutter at higher rpms is a sign of a bad MAF.
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Old 02-18-2012
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My guess would be a clogged cat... no CEL?
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