Is my IAC valve causing all my problems with my 2.3?
Hello everyone. I'm new to this forum.
I have a '94 Ranger 2.3 FI 5-speed which I just purchased thats in nice shape and has less than 100k.
I have been having a problem since I got it. When driving along down the road the throttle seems to be VERY touchy. The best way to describe what it was like is that it feels like there is little to no area in the throttle position to just coast along at one speed and one RPM. It was either wanting to accelerate or decelerate abruptly which created this extremely annoying herky jerky feel as the truck would lurch forward or back with just the "slightest" variation of the gas pedal. Another way to describe it is that it felt like lots of slack in the drive train since the truck would want to sometimes lurch back and forth in gear if I let the RPM's drop to low, like just idling down a long driveway. That led me to go through all the drive drain components and all the drive train is perfect. I then learned that its possibly the IAC valve causing this. So I took it off and tried to clean it but it was obviously not working right. I couldn't get one from any parts store since everyone had to order one which led me to simply reinstalling it so I could drive but I had to leave it unhooked too. To my surprise the truck ran AWESOME with the IAC completely unplugged electrically. Not as easy to start cold but it now drove like I thought it should.....but since the IAC controls idle speed, the idle was too low. So I turned up the idle speed to about 700-800 but then the problem with that became that when the engine warmed up the idle increased to about 1100. Not a big issue but I knew it was wrong. So I bought a new IAC hoping that all would be right and sadly.....no its not. Yes, the truck drives better than it did with the old IAC but it still has this herky jerky touchy throttle issue that almost makes it no fun to drive. I can see where it would not affect an auto tranny truck as much as this little 5 speed reacts to throttle changes. Anyone have any ideas? I was desperate enough to consider trying to rig something up too. Like possibly having the IAC valve only come on when the A/C compressor kicks on so that the IAC isn't constantly messing with the intake.....if thats whats really causing my issue. Also, I did check all my vacuum lines and vacuum is fine.
Last edited by stephano; 04-13-2011 at 10:19 AM.