Our 1987 240 GL with 225k this spring lost power and I took a quick look and found that the first 2 cylinders had about 150 psi and the 3 and 4 had 0! My feeling was that it at least needed a new head gasket. I started the project a couple of weeks ago and indeed it needed a new head gasket. I also had the head milled and new valve seals installed. The valves all looked good. Got everything back together and noticed that the engine was not running smoothly and stalled frequency after accelerating… Did another compression test when engine was warm and all cylinders are 155 psi… All spark plugs looked clean and dry. I started to pull the each spark plug wire and found number 2 did not make a difference to the engine running all others caused the engine to run much rougher… Check spark, changed out wire, distributor cap, and plug but no difference… I did spray starter fluid around the base of each of the injectors and the engine performance did not change…
From here I am thinking the # 2 is not getting any fuel! I am not sure how to test if the injector is getting power or if the injector is working correctly. Is there anything else I should be looking at before taking apart the fuel system?
Roger