Maintaining revs after cold start

[massive]

Currently have an inconvenient issue where the revs will drop and stall the car after a cold start.


The car starts first time no problem in the morning and the revs idle around 700-800 rpm quite happily, I then reverse off the drive and go to put it in 1st but the revs will drop before I have a chance to move away and the car stalls. I then start the car again and drive away and the problem goes away until I do a cold start in the evening or the next day.

[Rasta Monsta]

There is a component in the fuel injection system designed to prevent this problem, the ICV or idle control valve. A few things can cause ICV problems.

1. ICV missing, unplugged, or non-functional.
2. Idle air bypass screw out of adjustment.

You can consult Clark's Garage for idle adjustment procedure.

If all that checks out, I would next suspect the coolant temperature sensor.

[Volhv]

I got the exact same thing happening.
Definitely the ICV. Did not want to open or close when applying voltage to it, until I cycled it a few times. It was slow to operate..... I need a new one.

Adjusted the idle via the screw when I resealed the throttle body last weekend. Now it idles great when it's warm.

The ICV sometimes decides to start working again but usually I need to keep the throttle depressed so it won't stall out while idling till it warms up.

[massive]

Early 944 doesn't have an ICV, it has an Auxilary Air Regulator and an Electric air Valve

Guess I should check my own blog posts more often944 Foot To The Floor: Erratic Idle Problem Porsche 944 (Square Dash Model)