Ok, here is the short of it.
Head cracked, got new (used) 35k engine. While it was out I had all 4 injectors cleaned (remember that part). Got the engine put all back in and at first seems to run "ok" except for a few small things
1. A bit hard to start the car. Nothing real bad, seemed like it may be flooded. After it was started it ran great.
2. Seemed as if I was getting gas in the oil. I thought I was just being paranoid. You know how it is when you first do and engine swap, very critical about any little thing.
So, anyway I was dealing with these two problems when out of nowhere my car began to idle like crap. I mean REAL bad. But, when I would get on it (like to go up a hill) it had great power and pull. I narrowed it down to the #3 cylinder by simply pulling the plug wire and could see the engine ran no different at idle. Then I pulled the plugs and found that the #3 plug was very fouled up (see the picture below 1 to 4 left to right).
Per a suggestion I bought a compression gauge and checked things out. All of the cylinders are in the 145 to 155 range. Can someone verify that these pressures are ok?
This is when I stumbled on what is going on. While I was moving the compression gauge form one cylinder to another I noticed this "pppsssstttt" sound (like a slow air leak in a tire) coming from the engine. As I got closer I could clearly tell the sound was coming from the #3 spark plug tube. At that point the light bulb kind of came on. I decided to blow a little air down in the spark plug tube to see if any fumes would come out (not the smartest idea) and the gas fumes that came out about knocked me over. It was clear to me that the injector is dumping fuel in to the cylinder while the car was turned off. Then I remembered this little comment that the guy who cleaned the injectors made to me when I picked them up which was "the Nissan injectors are prone to leaking after they have been cleaned".
One last observation I noticed this morning. I turned on the ignition this morning and I could hear the whole fuel system charge up. I have never heard that before. I guess this would all explain why I am getting gas in the oil also, yes???
Ok, here is my theory. The injector is just dumping so much gas in to the #3 cylinder that it can't even fire. And the reason it runs ok and has power on a load is because it can eat up and burn all that fuel.
So, that’s what I'm thinking. Does anyone have any experience with this or have any comments?
