How to measure the dwell angle on a Porsche 911?
You can measure the dwell angle on 1965-68 911s by hooking your meter up to the positive and negative terminals of the coil. On 1969-1977 911s, you will need to use a different technique since the capacitive discharge system won’t give you an accurate signal.
What was the problem with my 1987 911?
Comments: 1987 911 idles fine but misses badly under load after running great for years. While running, sprayed distributor with soapy water in the dark. Produced a random “light show” around the connectors on the distributor cap and finally killed the engine. Observed no other sparks from wiring, just distributor connections.
What do the timing marks mean on a Porsche 911?
Different year 911s had different timing points, but it should be marked with a number “5” or similar marking. This mark indicates the timing mark for five degrees before top dead center, or after top dead center, depending upon the year and engine.
Where is the idle speed sensor on a Porsche 911?
Strap the sensor around the spark plug wire for cylinder number one, which is located on the left side of the car, towards the rear of the car. Make sure that the car is warmed up before you take the timing measurement. Also make sure that your idle speed is set to the correct range.
How to set the dwell on a Porsche 911?
Be very careful not to place any tools or fingers near the fan when the engine is running, and watch the cord of the timing light as well. On the pre-1977 911s, you must set the dwell angle for the points as well as the timing position of the distributor.
Where are the breaker points on a Porsche 911?
On the earlier cars, the breaker points are controlled by a cam that is located on the main shaft of the distributor. As the distributor rotates, the cam pushes the points open. At this point the coil releases its stored energy and sends a charge to the spark plug determined by the position of the rotor inside the distributor cap.
How to set idle speed on Porsche 911?
For details on setting the idle speed for your 911, make sure that you look at Projects 29-31, which are specific to each different type of fuel injection system. To properly set the timing, you may have to remove the vacuum hoses from the distributor.
Different year 911s had different timing points, but it should be marked with a number “5” or similar marking. This mark indicates the timing mark for five degrees before top dead center, or after top dead center, depending upon the year and engine.