Can I do this?
Thread Starter
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Joined: May 2001
Posts: 1,594
Likes: 0
From: Pittsburgh, PA
Can I do this?
I'm gonna try to check my injectors while hooked up to the car. Now can I just leave them hooked up and just hang them inside cups, to see if they spray right? The real question is; to check all of the injectors I need to have the upper manifold removed; so can I still turn the motor over without the upper manifold bolted on? How exactly should this be done?
91 NA
91 NA
mad scientist
Joined: Feb 2001
Posts: 2,665
Likes: 2
From: Savannah, GA
Since its obvious you dont want to send them out...
First, you can turn the engine over with the manifold off, but dont expect the engine to start. Keeping that in mind, make sure everything that the engine needs to turn over(not start) is connected. The CAS must be connected. I would do the secondary injectors first, then pull off the rest of the manifold and check the primaries.
A word of warning, do not use thin plastic cups(the party kind) or styrofoam cups. Gas will dissolve those within a few seconds(ask me how I know).
Overall, its pretty straight-forward. Make sure that nothing will get sucked into your engine, the CAS is connected, etc. You are going to have to hold the injectors to the fuel rail, the pressure will pop the injectors out if youre not holding them. You might want to get some latex gloves or something, because you will get gas on your hands.
First, you can turn the engine over with the manifold off, but dont expect the engine to start. Keeping that in mind, make sure everything that the engine needs to turn over(not start) is connected. The CAS must be connected. I would do the secondary injectors first, then pull off the rest of the manifold and check the primaries.
A word of warning, do not use thin plastic cups(the party kind) or styrofoam cups. Gas will dissolve those within a few seconds(ask me how I know).
Overall, its pretty straight-forward. Make sure that nothing will get sucked into your engine, the CAS is connected, etc. You are going to have to hold the injectors to the fuel rail, the pressure will pop the injectors out if youre not holding them. You might want to get some latex gloves or something, because you will get gas on your hands.
HAILERS
Joined: May 2001
Posts: 20,563
Likes: 27
From: FORT WORTH, TEXAS,USA
You can check them to the factory manual. You can take the two bolts out of the secondary rail and lift the injectors out of the bores. Zip tie the injectors to the rail. Build a harness with two wires going to a spare injector plug. Put a alligator clip on each end. One alligator to batt ground. Place a container under the injector to be testedl Put the spare injector plug on the injector. Jumper your fuel pump to work by jumpering the yellow plug on the r/h strut tower. Turn the key on. Put the other alligator to the positive batt post. Wait exactly 15 seconds and disconnect the alligator leads. Pour the contents into a graduated measuring cup. Compare the results with the figures in the manual.
Also, with the fuel rail pressurized and the injector turned off, look for leakage. None allowed. One fault with that part of the test is that the injectors are not up to their running temp, and things act differently when hot or extremely cold.
Also, with the fuel rail pressurized and the injector turned off, look for leakage. None allowed. One fault with that part of the test is that the injectors are not up to their running temp, and things act differently when hot or extremely cold.