Engine trouble
 

Hello,
My 944 S2 model 89 are running only in 3 cylinders. Cylinder one is not working
Compression is ok.
Spark is ok
Fuel is coming.
Nozzles are working.
Only differens I can find is the resistans between ballast resistans red cable
and point 1 at socket for the nozzles.
For cylinder 2-4 is the resistans 2M ohm, but cylinder 1 have only 23 k ohm.
Can that be the problem?
Is there anyone who can help me?

Bad #1 injector...

Air, spark, fuel, compression....

-Try switching spark plug wires with another cylinder and see if the misfire continues on cylinder 1.

- check spark plugs on cylinder 1 or switch with different cylinder

- check injector on cylinder one (as others have said) or swap injector to other cylinder, see if misfire follows to that cylinder

My '86 944 NA was acting like it had a dead #1 cylinder. I had good compression, verified spark, verified fuel delivery, but it was missing like it was running on 3 cylinders. Used infrared heat gun on each of the 4 exhaust manifold pipes, and cylinder #1 was not cold, but it was a few hundred degrees cooler than #2,3, and 4 with the engine running.

Bought an inexpensive boroscope camera and looked in each cylinder through spark plug hole. Cylinder #1 had some coolant in there. That's why it was running rough (and cooler) on #1 -- blown head gasket and leaking coolant into the combustion chamber. There was also a tiny amount of coolant in #2, but none in 3 and #4, so my head gasket was beginning to fail.