Before you start the technique of replacing a fuel injector or fuel injection rail, you need to think about safety. Always keep fire safety in mind when you are working with fuel. You also need to be sure you are wearing eye protection. Even if you have released the pressure in the fuel injection technique, there could be some fuel flying when you start disconnecting high pressure lines and removing injectors.
Be sure to follow the procedure for relieving the fuel system pressure. Very important!
over your car's injection system. Some systems are easily accessible
and others are practically buried. Plan your attack so your job can be
It's a good idea to get a fuel injector puller if you are
removing fuel injectors. There are other ways to do it, but you risk
damaging expensive fuel injection components.
If your fuel
injection system has a fuel rail to deliver fuel to the fuel injectors,
you will ahve to remove this before you are able to remove the
injectors. This is an easy job.
First, disconnect the main fuel
line at the end of the rail. There may be an additional line at the
other end, so remove that one, too. The fuel rail is help in place by
screws or bolts, depending on your car's setup. Remove these screws or
bolts. If your wiring travels over the top of the rail, see the next
step to disconnect the wiring first. With everything disconnected from
the rail, pull it away from the fuel injectors. Most fuel rails are just
pressed onto the injector tops, once you've removed the hold down
screws or bolts it should pull away, with a little oomph.
car uses a fuel rail to deliver fuel to the injectors, you removed it
in the previous step. If you don't have a fuel rail, you'll need to
remove a fuel line from the top of each injector. It's just as easy to
remove, just do it carefully.
With the fuel delivery out of the
way, you're ready to disconnect the fuel injectors. Each injector will
have a plug at the top (or on the side near the top) that connects to
the wiring harness. Most fuel injector wiring plugs are held securely in
place by a springy wire (see pic). To remove this wire, just insert a
flat head screwdriver in the space between the spring and the plug and
pry it carefully away. It will come out easily. Don't lose it!
all of the other stuff out of the way, you're ready to yank the
injector. Unfortunately, many people really do try to yank them out.
Remember, your fuel injectors sit right in the middle of the delicate
are of the engine, so any piece you break off might fall in, and this
equals big pain in your fanny.
The safest way to remove a fuel
injector is to use a fuel injector puller. There are other ways to
remove fuel injectors, but if you aren't careful you could damage some
expensive fuel injection components. Besides, the injector puller makes
it so easy, just slide it underneath the lip in the injector housing and
pop the injector out.
Your fuel injector goes into what amounts
to a hole in the intake manifold (or your head if you're lucky). When
you remove the injector, you leave this hole open. Be very careful to
keep anything from falling in. This can be a real chore to fix.
the immortal words of every auto repair tutorial, installation is the
reverse of removal! You'll require oiling the new injector seals before
they go in, and keep in mind to go simple, don't force anything in.
tags: fuel injector diagnosis & cleaning equipment, fuel injector cleaner