'83 911SC hunts & stalls

[986geezer]

'83 911SC starts then when warm begins to hunt . This hunting up and down revs eventually becomes so great the car will stall. One has to keep the clutch in and foot on the gas at red lights to keep the car from stalling in traffic. Once rolling it runs fine. Any buddy have a clue? Recently a rebuilt fuel distributor, cleaned injectors and replaced gaskets, new plugs and wires. ????

Thanks for any insight. 986geezer

[magcuda]

CIS fuel system, need to be sure the sensor plate is set correct. need to check fuel pressures and warm up regulator and also the idle air valve.

not a fun system and you can pull your hair out getting it right. there are some books on these systems.

if you take it to a shop ask them if they have anyone that is fimilar with the system. it will probably an older tech

[will911]

oxygen sensor relay under passenger seat. check to see if it's the original one; should be a VW/audi relay with a metal outershell. If that relay is acting up, you will experience bucking, stalling hard starts, etc. Try to start the car and play w/ the relay; does the engine respond? You should be able to feel it click also. You can unplug the relay from the harness to see if the engine reacts; when the relay is unplugged, the engine should start to die... Try replacing the relay.

[stealthn]

'83 911SC starts then when warm begins to hunt . This hunting up and down revs eventually becomes so great the car will stall. One has to keep the clutch in and foot on the gas at red lights to keep the car from stalling in traffic. Once rolling it runs fine. Any buddy have a clue? Recently a rebuilt fuel distributor, cleaned injectors and replaced gaskets, new plugs and wires. ????

Thanks for any insight. 986geezer

Hmmm, did it ever work after the work done? Check the distributor there is a green wire there and see f it's connected or broken, also check the spark plug wires to make sure they are going to the right cylinders. If all that pans out I would suspect the warm up regulator. You can gently hit this with a rubber mallet while the engine is running and see if it changes the hunt.

Good luck