Alfa 33 1.7 ie lost one cylinder
Keeping my 1989 33 going has been relatively easy over the last few years but am a bit stuck with the latest problem.
During the week my wife said that the car was stuttering under load.
At the end if the week she limped home, engine running rough all of a sudden.
Pulling the plug of cylinder one indicated that it was the culprit as this had no effect on the idling engine.
I checked and found a spark at the plug and the compression in cylinder one was approx 110psi.
I next checked the injectors. There did not appear to be an audible ticking at cylinder one injector (screwdriver to the ear) compared to its neighbour. I pulled the two injectors and the internal resistance was about 15ohms each. I next checked each with a nine volt battery and both worked. I swapped their positions and restarted the car. Still an issue with cylinder one.
Now I am stuck! I don't have a circuit diagram for JETRONIC LE 3.1 so not sure how to check for continuity back to the AFM. I guess there could be a way to attach a 12v bulb to the injector lead to see if it is getting a signal. I am not 100% sure there is fuel getting injector one, but it is common railed with its neighbour so I think it is, as the car would not run on two cylinders on one bank.
Has anyone got any ideas how to troubleshoot this further? I don't have another AFM to swap out if it is the ECU playing up. The early symptoms leading to the final failure might be a clue.
Any help much appreciated.