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Pulled fuel injectors on 90 model truck, now question.

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Old 06-24-2010, 07:04 AM   #1
luk8272 [OP] luk8272 is offline
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Pulled fuel injectors on 90 model truck, now question.

Purchased a 1990 4x4 truck. Started the TLC. I replaced oil and filter, Trans oil and filter, Spark plugs, plug wires, MAF Sensor, Battery, Diff fluid both front and rear, and fuel filter. I had a few plugs that were in poor condition just looked nasty (dirty not burnt up) slightly oily. Since I have changed them I pull them randomly to look for wear all seems good. After all of that the fuel mileage is still horrible. I then noticed a fuel leak from my fuel rail. I pulled the Plentum and noticed that where the injector goes into the rail it was just pooring fuel. I removed the rail to find there were no seals on that injector. I pulled all of the injectors to check them. Purchased a seal kit for each injector. I have 1 injector that is very oily and wet where it slips into the boot. What is causing this, another words what do I replace now?
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Old 06-24-2010, 07:07 AM   #2
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PCV valve maybe? You may just need to clean the plenum out with a good seafoam treatment. Is this a 22RE?
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Old 06-24-2010, 07:18 AM   #3
luk8272 [OP] luk8272 is offline
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I wish it were the 22re. Its the 3.slow.

Could you explain how cleaning the Plenum would help? The injector is down in the cylinder as is the spark plug, I don't see how the injector could get oily unless their were some seals leaking but I am just guessing here as I have never torn into a fuel injected motor like this before.
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Old 06-24-2010, 07:23 AM   #4
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Quote:
Originally Posted by luk8272 View Post
I wish it were the 22re. Its the 3.slow.

Could you explain how cleaning the Plenum would help? The injector is down in the cylinder as is the spark plug, I don't see how the injector could get oily unless their were some seals leaking but I am just guessing here as I have never torn into a fuel injected motor like this before.
The injectors aren't in the cylinder like the plugs are.
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Old 06-24-2010, 09:42 AM   #5
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Oil can get in the pcv vac line, it goes through the intake.
Check your compression. Low compression means you are getting a lot of blowby, which also means more flow throught the pcv system.
Also, check your engine with a vac gauge. That will give you a quick check of your engine's health.
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Old 06-24-2010, 11:26 AM   #7
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The heads, crank, pistons and rods have to be assembled. To do a compression test.
The engine needs to be running to do a vacuum test. There's a chart on the internet to read the vacuum gauge. If I remember correctly, a steady 15psi of vacuum is good at idle.
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Old 06-24-2010, 11:28 AM   #8
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You can get a compression tester at your local auto parts store. They just screw into the spark plug hole. You simply manually turn the motor over until you get a reading on the cylinder that you have the tester in. No disassembly required.

They look like this

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Old 06-24-2010, 11:32 AM   #9
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It takes four complete turns of the crank to get an accurate reading from one cylinder. Use the starter and let it cool inbetween cylinders. Make sure electrical is disconnected from injectors and coils.
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