ugh i need help with an idle problem - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 03-11-2010
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ugh i need help with an idle problem

okay. the rundown./ a couple months back my check engine light came on. took it for a diagnostic and both engine banks were running lean. over the course of a couple months. i have tried many fixes. fuel injector cleaner, sparkplug replacement, oil changes, and today i cleaned my mass airflow sensor. the truck has had a rough idle ever since the light came on. jumping from 1100 to 400 and dying if i sit idle for long periods of time. when driving. occassionally i would push clutch in and the engine speed would stay at 2500 or so (depending on how fast i was going prior) and i would have to slow down and release clutch in fifth gear to bring RPMs back down to idle speeds during a stop. i cleaned MAF today and engine seemed to run a lot smoother, however. idle was still all over the place. even reaching 3k rpm after a romp on the gas. and pushing the clutch in raised the rpm a bit before falling back down to 2k area. i dont know wtf is wrong or how to fix it at this point. any help would be greatly appreciated. i dont wanna get rid of my 02 fx4. so plz... help a fellow out
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Old 03-11-2010
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I would tell you to use the search button at the top of the pane for the IAC valve , but there would be so many threads it would boggle your mind.
The Idle Air Control valve is mounted on the throttle body .It bypasses air around the butterfly plate to maintain idle speed. You need to remove it and clean the pintle and the hole the pintle slides into .

Edit to add
clean with carb cleaner.
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Old 03-11-2010
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Quote:
Originally Posted by OTRtech View Post
I would tell you to use the search button at the top of the pane for the IAC valve , but there would be so many threads it would boggle your mind.
The Idle Air Control valve is mounted on the throttle body .It bypasses air around the butterfly plate to maintain idle speed. You need to remove it and clean the pintle and the hole the pintle slides into .

Edit to add
clean with carb cleaner.
so the MAF cleaner wont work on it? darn so i need to go to autozone and pick up some carbuerator cleaner?
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Old 03-14-2010
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okay, so i cleaned my IAC valve with the carb cleaner... still the same problems. fixed a little of it, but still a rough idle..
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Old 03-14-2010
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sounds like your idle air controller is jammed from all the gum build-up

try un-bolting the idle air controller from the throttle body

try cleaning the outside of the idle air controller ( be careful though )
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Old 03-15-2010
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Originally Posted by cheese_man View Post
sounds like your idle air controller is jammed from all the gum build-up

try un-bolting the idle air controller from the throttle body

try cleaning the outside of the idle air controller ( be careful though )
done. i honestly dont know what else to do. my beloved fx4 is about to be traded u know, i guess i could try changing fuel filter, belts (because one is whining like a super charger. lol) or maybe i could start thinking about that 5.0 swap
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Old 03-16-2010
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is your engine ohv or sohc

how many miles on your engine

you might want to try the ,, automatic tranny fluid flush

check your oil level , if it is good ,, add 2 quarts of ATF fluid .
run engine at 1,100 rpm`s for a minute then let it idle for 30 minutes, then do an oil change
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Old 03-18-2010
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Quote:
Originally Posted by cheese_man View Post
is your engine ohv or sohc

how many miles on your engine

you might want to try the ,, automatic tranny fluid flush

check your oil level , if it is good ,, add 2 quarts of ATF fluid .
run engine at 1,100 rpm`s for a minute then let it idle for 30 minutes, then do an oil change
Its a SOHC with 94k miles on it. and i doubt it idles for 10min before dieing on me. lol
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Old 03-18-2010
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my idle on my 4.0 was all over the place too. In fact, other than cold start, it ran better WITHOUT the IAC plugged in. At least it didn't try to run over people when I came to a stop. It would go 40 without ever touching the gas. A couple of people said replace the IAC, I did, but that was a waste of $50.

I went on IATN to see if there were any tips. Most of the related problems went unsolved, BUT one thing to try (and cheap too!) was to disconnect the battery for 10+ minutes, then hook it back up and see if it works better. It's been three days (knock on wood) but it is acting perfectly now.
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Old 03-21-2010
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Originally Posted by allstateguy View Post
my idle on my 4.0 was all over the place too. In fact, other than cold start, it ran better WITHOUT the IAC plugged in. At least it didn't try to run over people when I came to a stop. It would go 40 without ever touching the gas. A couple of people said replace the IAC, I did, but that was a waste of $50.

I went on IATN to see if there were any tips. Most of the related problems went unsolved, BUT one thing to try (and cheap too!) was to disconnect the battery for 10+ minutes, then hook it back up and see if it works better. It's been three days (knock on wood) but it is acting perfectly now.
iv had the battery unplugged for a day or so at a time since the repair.... nothing. its posted on craigslist/indianapolis now.
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Old 03-21-2010
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the lean codes, and sputtering at idel sound like the rubber elbow that cracks that goes into your intake. i had the same issue and it fixed me, however, i dont have a manual.

try this it was a cheap one to fix and can cause a heap of problems.
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edit- the cut you see on the rubber elbow is from me. i had to cut it to get it off but was cracked on the bottom. were the arrow is, is the inlet to the intake it hooks too. following that elbow is a plastic tube that runs along side the engine(passenger side), this is the system you are looking for.
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Old 03-21-2010
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it could also be your throttle positon sensor, thats what my cel came on for a while back and my problem is getting worse, yet the cel turned back off ... im about to take my truck in for that and it needs brakes now too ..... this thing is requiring a hell of a lot more maintenance than any of my hondas did, and has less miles on it to boot.

I have a 99 2.5 though
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Old 03-21-2010
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Quote:
Originally Posted by fourliter dan View Post
the lean codes, and sputtering at idel sound like the rubber elbow that cracks that goes into your intake. i had the same issue and it fixed me, however, i dont have a manual.

try this it was a cheap one to fix and can cause a heap of problems.


edit- the cut you see on the rubber elbow is from me. i had to cut it to get it off but was cracked on the bottom. were the arrow is, is the inlet to the intake it hooks too. following that elbow is a plastic tube that runs along side the engine(passenger side), this is the system you are looking for.
wow, suprised it took this long for someone to say this. it is either this elbow or some sort or vacuum leak (intake gaskets possibly). the IAC will not produce a lean code, neither will the truck needing an oil change
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