'81 turbo spider idle problem

[opmills]

I've had a rough idle on my '81 turbo for several years. Never could figure out the problem. This year I noticed that, when the engine is cold, the idle is fine - smooth. As it warms up the idle becomes rough. The car runs fine otherwise. Does this new bit of information provide a clue about the problem's source?

Thanks!

Owen
1981 Turbo Spider
U.P. of MI

[So Cal Mark]

the change might be because the cold idle is higher than when warm. If you raise the warm idle slightly, does the motor smooth out?

[opmills]

Mark,

What RPM should the engine be running at idle? 1200?

Owen

[So Cal Mark]

I like 1050-1100 rpm

[giuliot60]

Is that idle speed for the turbo only, or for FI as well? I thought it was lower.

I just got my '81 running after fixing a gas leak since purchasing it almost 2 weeks ago (it's a turbo that was converted to FI). My #1 doesn't appear to be firing properly, giving me a rough idle, but I'm going to post the details in a new post. I'd appreciate any advice Mark. Hi Owen.

GT