So I've been working on my Eta. I discovered that the idle control module (the little green box next to the ECU/DME) was completely missing from my car, so I went to the scrap yard and pulled one, along with a throttle body and TPS that I haven't installed yet. The previous owner had substituted in a plumbing ball valve in series with the ICV.
So the ICV works and is getting power. About 6 volts at about 100 Hz, my multimeter says. Reads 10 ohms as well, which is in spec. Also cleaned it with carb cleaner. Throttle body plate is also spotless.
The idle was pretty bad before, but it was somewhat stable. Now it's doing this. Surging about once per second between 800 and 1500 rpm. I pulled the vac hose to the FPR and plugged it, and nothing outwardly obvious happened, so I doubt that's the problem unless I'm missing something.
If I disconnect the ICV, the idle rises dramatically (~3000).
Could it be the MAF track being dirty?
I don't know where to look next.
So the ICV works and is getting power. About 6 volts at about 100 Hz, my multimeter says. Reads 10 ohms as well, which is in spec. Also cleaned it with carb cleaner. Throttle body plate is also spotless.
The idle was pretty bad before, but it was somewhat stable. Now it's doing this. Surging about once per second between 800 and 1500 rpm. I pulled the vac hose to the FPR and plugged it, and nothing outwardly obvious happened, so I doubt that's the problem unless I'm missing something.
If I disconnect the ICV, the idle rises dramatically (~3000).
Could it be the MAF track being dirty?
I don't know where to look next.
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