No idle - '74 2.0l FI Options

[watsonrx13]

Since I've rebuilt my '74 2.0l FI engine I've had problems with the car not idling. After it warms up it dies. I've set the timing to 27 and the dwell is at 46. I tried adjusting the ECU knob and the air idle screw but neither appear to have any effect on the idle. When I adjust the knob I can feel it click. I counted 21 total clicks. The engine runs great above idle. The injectors have been rebuilt, new AA vacuum hoses replaced, all gaskets are new.

Can the ECU be taken apart and cleaned?

Does anyone have a pic of the ECU opened up showing the knob area?

Any recommendations on how to fix the idle problem I'm having?

-- Rob

[watsonrx13]

I was finally able to work on the car this weekend. I'm still having problems with the engine not idling, hot or cold. I took the car out for a quick drive and didn't have any issues except when I stopped.

I went by after work and checked the following. After reinstalling the AAR I wasn't able to start the car at all now.

Here are the components that I checked:

1. MSP - I pumped it up to 20hg. I checked it again in 5 min and it was at 17hg.
2. I removed the AAR and hooked it up to a 12v power supply. At the end of 10 min it had heated up and the valve had closed.
3. I checked the CHT when it was cold but only got a reading of 1, regardless of the ohm settitng. After the car was warmed up I disconnected the CHT and hooked a wire directly to ground, which seemed to help.
4. I reset the TPS as suggested above.
5. All of the vacuum hoses are new and tight.
5. All of the seals are new.

What components make up the idle circuit? It appears that something is telling the ECU that the motor is not running and therefore no fuel is being injected when in the idle mode.

Here are some pics of the vacuum lines, does anyone see anything wrong? BTW I used AA's vacuum hose diagram.









-- Rob