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?

 

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.

 

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.

 

I'll get on those tomorrow today I am playing with my daughter. I'll have to use a shop to do these as I no longer have either tool I need. Will having the engine apart affect these test, another words will I have to reassemble it?

 

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.

 

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.

 

Thanks for the refresher man I won't lie I have become spoiled. All these new vehicles fun with no issues. I Used to have an 87 chevy that I worked on every weekend. Then I traded up to an 02 then an 07 tacoma. Making life simple. The things you can forget in a matter of 7yrs.