1981 Ferrari 308 GTSi R2 Points Bypass

Put a piece of electrical tape over the contacts on that set of points.

 

R2 points were last used on 1979 US version carb 308 (so not present on a 1981 308i of any version). Can you be more specific about what year/model/version 308? The 1980-81 timeframe was when VINs got standardized so you might still have a non-standardized VIN (and "model year" in Europe could more represent when the paperwork was created rather than the car), but, if you have the standardized 17-digit VIN, you can decode it here: http://www.red-headed.com/vin.html

 

So many things . Your symptom could be fuel as easily as ignition. The usual investigation strategy is:

1. Examine the easy things in the ignition system -- spark plugs, spark plug wire resistances (and repierce at the dist cap, if necessary), inspect the extenders for resistance/holes, inspect the dist rotor and cap. If all that seems OK,

2. Start looking at the basic parameters of the Bosch CIS K-Jet without Lambda injection system to see if anything is now out-of-spec -- cold WUR control pressure, warm WUR control pressure, regulated supply pressure.

After that, it gets harder .

 

Assuming your problem is on the k-jet, you should first determine whether idle is bad within the first 10 minutes, or rough regardless of cold/hot.

Cold idle is managed as follows:
1) there is an idle air valve that increases the airflow for 10minutes or so. This one is easy to check : apply 12v, after 10 minutes the valve must be closed.
2) there is a warmup regulator that increases the fuel flow. This one is more complex to check: you do have to install a test gauge between the fuel distributor and the warmup regulator, and check how the regulator adjusts pressure over a 5 minutes period. The control pressure should progressively raise until it reaches 3.4~3.8 bar.

If the car does not idle properly when hot regardless of the position of the CO set-screw (it's on the fuel distributor, clockwise = richer), then it's time to read the k-jet book.

You should perform these tests with regular spark plugs, as thin tips plugs (iridium, platinium) do not like to be wet so they are a real pain when you want to adjust a stubborn engine...

 

If it just came out of a belt service, why don't you let the mechanic have a shot at it.