Thought the injectors might just be dirty so running a lot of fuel injection cleaner in the tank
Checked for problems;
Plug and coil spark (coils are brand new)
Mass Airflow sensor
Evap system
EGR system
Idle Air control valve
Whether gas was bad
Fuel pump and regulator pressure/vacuum
(O2 sensors not even a yr old)
After doing the above and going to Nissan for a $115 dollar diagnoses at Courtesy, a
determination was made the #1 fuel injector was "dead". I had previously checked
them (all but the #5 closely) several times and all of them were clicking. As you know the plenum covers three of the injectors, including the #1, so I could not multimeter/ohm them.
When I got to the fuel injectors during the disassembly I couldn't turn the phillips head
screws on the retainers so I broke out my Bosch drill which had a good torque trigger and got them out.
Foolishly I thought this would be a breeze job after that. It took about 30 minutes to
just get the electrical connectors off since they hadn't been removed in 18 years. Used
a lot of electrical cleaner etc. After removing the metal retainer covers (and the associated insulators) I tried wiggling the fuel injectors to get them out----and they were stuck.
First I tried my hand--no way even with WD40
Then I moved to pliers--no way
So I had to remove the fuel rail and I put it in a vise-same as above they wouldnt come out
I finally shook it out but my hand was getting sore so I used a punch and hammer to get the
rest of them out !!:mike
Except for typical problems with the intake plenum the reinstall went well. I put 3 in under
the plenum cause I really dont want to go back there!
I ohmed out the #1 fuel injector at about 39 ohms which is way out. Not looking at the
manual but I think 11-12 was normal. Also made sure I had 12 volts with the key on to
the injectors. The others seemed normal on the multimeter.
On reassembly a friend suggested I start the fuel pump (by turning on the pump not the
engine) to check for gas leaks first.
It is running well today. The dealership would have charged $400 labor to change one injector
but for the same money I changed three.
