82 won't run

[ssrodder]

I have an 82 911 with 59,000 miles that will start, but not run. It sat for about 5 years without being run. I have cleaned all the lines from the accumulator to the tank plus the return line, changed the tank, fuel pump, Lambda box, red fuel pump relay. When I manually move the lever in the fuel distributor with the lines to the injectors disconnected fuel will flow to each injector.

I have not changed the two small relay boxes that are mounted next to the Lambda box. I don't know what they are called and how to order them.

I connected a test light to the positive and negative wires at the fuel pump. The light will not show any power to the pump no matter what position the key is in until the engine starts. Once the engine starts the light show power to the pump. The power will remain until the motor stalls which is within five seconds after it starts. The engine starts with no problem and restarts with no problem. It just won't run after it starts.

I have a manual by James Weber "Solving CIS problems" and in the trouble shooting chart he states only three possible problems. 1. ECU (which I assume is the Lambda box) 2. Control relay (which I assume is the red fuel pump relay) 3. Fuel distributor.

I have a chance to purchase a used cis from an 81. Will the fuel distributor interchange.

Someone must have the answer.
fnsarno@aol.com

No success so I did some additional testing. I have no power at the coil when the ingition switch is in the run position. While the engine is cranking and runnning for about 4 seconds I get approximately 3 volts to the coil. Any suggestions.

[psalt]

Take a look at the wiring diagram. The fuel pump is powered by one circuit when the key is in the Start position and another when the key is in the ON position. There is a safety switch on the airflow sensor that is designed to stop the fuel pump if the engine stops running with the key in the ON position. The easiest way to test the circuit is to lift the air sensor plate with the key ON and listen for the pump. If the pump circuit is OK, your engine is probably stalling due to a lean condition at cold start, a common problem on old SC engines with lower compression, vacuum leaks, and out of spec fuel pressure. You need a CIS pressure gauge and a dwell meter to diagnose the problem. Your car also has a vacuum retard to help meet the curb idle HC test that can cause cold start stumbles and stalling. Remember to leave the throttle pedal alone when starting, you can only make the lean condition worse and cause a backfire. I would try disconnecting and plugging the grey vacuum hose to the back of the distributor, this should give you a bit more cold idle and may keep the engine running. Once it stays running, hook up an analog dwell meter to the green white stripe wire on the test plug and see what the CIS lambda is doing. It will talk to you, all you have to do is listen.

[Flat6pac]

Under the red relay, jumper wire post #30 to 87A and you should get fuel pump running.
The numbers are on the back of the relay.
Bruce

[boyt911sc]

Originally Posted by Flat6pac

Under the red relay, jumper wire post #30 to 87A and you should get fuel pump running.
The numbers are on the back of the relay.
Bruce

Only if the ignition switch is @ ON position.