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93 YJ trying to stall and loss of power

3K views 15 replies 7 participants last post by  The jeep hulk 
#1 · (Edited by Moderator)
My YJ randomly tries to stall right after being started and then runs fine. It will just run rough for a couple of seconds and then goes back to normal. The plugs wires and cap were just recently replaced. We also cleaned the throttle but that didn't seem to help. Now it doesn't feel like its running as strong as it used to. Any ideas on what it could be?
 
#2 ·
IAC. Idle Air Control valve. They get carboned up and need cleaned periodically. Not only the valve but the slot that it fits into the throttle body as well.

That would be my 1st guess.
 
#10 ·
IAC. Idle Air Control valve. They get carboned up and need cleaned periodically.
You've saved so many people bringing that up, it should be in your signature. :winner:
 
#5 ·
Well, you didn't add that detail in the beginning. Did you bother to take the air cleaner out and clean the air box?

Water that deep isn't good for an air system unless you are running a snorkel. I would bet the air cleaner got damp, and it is restricting the filter and flow of air. Once the air cleaner element gets damp it will retain the wetness until you swap out the element for a new one.
 
#11 ·
I wonder if you got water in the gas tank? Seems unlikely, but the cure is simple. There is a product call "drygas". From what I understand, it is alcohol that mixes with the water and then the water passes through the FI system. I don't know how much alcohol you might need but a quart of denatured alcohol shouldn't be too expensive and may help. The drygas should be available at your local auto parts store.
Good Luck, L.M.
 
#12 ·
I wonder if you got water in the gas tank? Seems unlikely, but the cure is simple. There is a product call "drygas". From what I understand, it is alcohol that mixes with the water and then the water passes through the FI system. I don't know how much alcohol you might need but a quart of denatured alcohol shouldn't be too expensive and may help. The drygas should be available at your local auto parts store.
Good Luck, L.M.
Isopropyl alcohol works pretty good too. You do need closest to 90% rubbing alcohol. Just be careful not to add too much
 
#14 ·
We thought it was water in the tank when it first happened so we used iso heet but that didn't seem to help. I ended up doing the whole morse code thing with the check engine light. I got a code for the coolant sensor so we replaced it and it actually stopped stalling out, but it was idling rough. Then we found a vaccum line that wasnt hooked up that went from the manifold to the map sensor. So far the jeep has been running fine.
 
#15 ·
So you had two things that caused what seemed like one problem. That's a good thing for all of us to remember as we look for the cause of whatever problem we are working on at the time.
Glad you got it fixed.
Good Luck and merry Christmas. L.M.
 
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