I am getting ready to run my engine on a test stand. I built an engine harness cable and extended the fuel and oil lines from the car. I am going to check CIS pressures tomorrow. I ran the fuel pump and lifted the air sensor plate. I put all six injectors in plastic bottles with the injectors poked thru the cap. I let it run for a couple minutes and then shut it down. It is very difficult to measure fuel this way so I weighed it with my wife's jewelry scale. I will post a picture of the results. By weight after pumping about 1/3 of the bottle they weighed as follows.
#1 153.9 #2 159.0 #3 155.6 #4 158.9 #5 157.2 #6 154.3
So the differential from low to high is 5.1 grams. Considering the highest volume of 159.0 grams that is roughly 3% difference. I had seen posts where the volume in glass bottles was significant. Mine seem very close.
The problem is they seem to be leaking when the air sensor plate is closed. Just small drips. I realize this condition doesn't normally occur as the pump is not normally running for extended periods when the sensor plate is closed. Should these injectors drip at all in this test? The spray patterns are not all the same but the volume seems close. Maybe the fuel isn't atomizing the same so I may replace all the injectors. I planned on testing the new injectors for volume and spray pattern the same way. Is this a good test and should they drip with the plate closed. I would say a drip about every 5 seconds.. when I shut the pump down it appears the dripping stops. These tests were done with the WUR unplugged in 60 degree ambient temp.
