ugh i need help with an idle problem
#1
03-11-2010
Join Date: Mar 2008
Location: Indianapolis, Indiana
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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 
#2
03-11-2010
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.
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.
#3
03-11-2010
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Location: Indianapolis, Indiana
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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.
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.
#5
03-14-2010
#6
03-15-2010
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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 
#7
03-16-2010
#8
03-18-2010
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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
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
#9
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.
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.
#10
03-21-2010
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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.
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.
#11
03-21-2010
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.
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.
#12
03-21-2010
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
I have a 99 2.5 though
#13
03-21-2010
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.
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.
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