When I loosened the brake booster vacuum line at the intake plenum I could visually force the fuel ratio meter/O2 sensor to show a very lean condition, I figured that the L-Jet computer was capable of evaluating the exhaust. My next step was to determine why the engine was running rich and where the extra fuel was coming from since the rail pressure was only 33 psi. The cold start circuitry and the primary injectors were electrically working fine. I then checked for the correct resistance at the temp I (air) and II (water) sensor and traced their wiring back to the computer connector. Finally I started unseating the injectors. The problem turned out to be a fairly steady drip from the cold start injector. While digging around in amongst the engine bay fuel lines I discovered a couple of the larger rubber hoses were rock hard and their outer surface was beginning to show some stress cracks. They all looked good when I bought the car and the owner had said that he'd already had the intake refreshed. But ......to be safe I've decided to go ahead and replace all the high pressure rubber lines and send the injectors out to be cleaned. I guess to the PO "Refreshed Her Top End" may have just meant that Miss Purdy had danced her way into the toilet to powder her nose.
Does anyone know the metric ID of the fuel lines I will need ? There seems to be quite a discussion on whether the Gates 3/8" and 5/8" hoses should be used.
Thanks, Michael