I finally solved my hanging idle problem, but looks like I created another.
Last time I smoked my system I found my throttle shaft (bottom) and EGR leaking.
Rather than screw with a bone yard TB, I picked up a new BBK 65mm TB and spacer. New TPS included was already set, but I checked it 4 times as I set the idle. Before I replaced the EGR I wanted to see how a new TB ran. Test drive was good, but car idled too high. I unplugged the IAC and set the idle at 600. Car seemed to run pretty good except abrupt stopping or if the car was under a load (turning wheel at low speed) would almost stall the car out, then my idle would dip almost to the point of stalling and rise about 3-4 times. For a few seconds, car seemed to struggle to keep running, then back to running fine. I did notice the car seemed to idle low after driving for 15 minutes with my new setup. Even though I set the idle by the book, I turned up the idle screw 1/4 turn (still might need to turn it up a little).
At this point I had not replaced the EGR, but have since installed a new one- no change
My IAC is not new, but clean and I would think if it were junk I would have noticed issues with the old TB. I do have a new motocraft IAC in the box (funny it doesn't say Ford on it).
Any ideas? The only thing different from "no stall problem" to "stall problem" was my TB and spacer. The new EGR didn't change anything.
-Is my idle too low? I could see this possibly contributing to this problem.
-Is this a symptom of an IAC that I might not have noticed before b/c my idle would hang then come down to idle? Is it the IAC that increased RPM slightly as you slow down so you don't stall out?
I have not pulled the codes yet, but will probably do that next.
Last time I smoked my system I found my throttle shaft (bottom) and EGR leaking.
Rather than screw with a bone yard TB, I picked up a new BBK 65mm TB and spacer. New TPS included was already set, but I checked it 4 times as I set the idle. Before I replaced the EGR I wanted to see how a new TB ran. Test drive was good, but car idled too high. I unplugged the IAC and set the idle at 600. Car seemed to run pretty good except abrupt stopping or if the car was under a load (turning wheel at low speed) would almost stall the car out, then my idle would dip almost to the point of stalling and rise about 3-4 times. For a few seconds, car seemed to struggle to keep running, then back to running fine. I did notice the car seemed to idle low after driving for 15 minutes with my new setup. Even though I set the idle by the book, I turned up the idle screw 1/4 turn (still might need to turn it up a little).
At this point I had not replaced the EGR, but have since installed a new one- no change
My IAC is not new, but clean and I would think if it were junk I would have noticed issues with the old TB. I do have a new motocraft IAC in the box (funny it doesn't say Ford on it).
Any ideas? The only thing different from "no stall problem" to "stall problem" was my TB and spacer. The new EGR didn't change anything.
-Is my idle too low? I could see this possibly contributing to this problem.
-Is this a symptom of an IAC that I might not have noticed before b/c my idle would hang then come down to idle? Is it the IAC that increased RPM slightly as you slow down so you don't stall out?
I have not pulled the codes yet, but will probably do that next.