I have a 2000 volvo S40 19T, it starts up, and will run just fine if you give it any amount of gas, but it just wont idle. I unplugged the MAF sensor and it ran the same. I then took the IAC valve off and put a towel over the port (To let some gas in but not completely shut it off) It runs GREAT like that! I kept the IAC plugged in and the towel over the port, started her up and put a lot of pressure on the towel to cut of all air, the car idle went really really low and then it shut off. Now since the car knows it is stalling, and it needs more air I should be able to see the IAC opening and closing (Remember it is plugged in, but in my hand), it didn’t move at all!
Well 180$ and one new IAC valve later we still sit with the same problem. I have run the car with my towel over the IAC ports and chased all around the intake manifold and other intake duct work with carb cleaner to try and fine vacuum leaks to no avail. I even did the towel trick with a multimeter hooked up to the wires that plug into the IAC valve, it is getting a small amount of voltage, say 2 to 3 volts, but the new valve still wont open, and I have yet to confirm that the current changes with idle fluctuations when I press on the towel.
I am running out of ideas! I tried unplugging the battery to clear the ECU so it would restart with the new IAC but that didn’t work. Please give me some tips!
Is it possible it really IS the IACV and I was given a lemon?!