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Injector Changeout Suppliment
If you need to know how to remove the plenum, click here and follow the link back when done
 

This page deals with changing out the injectors to really any size or replacing a bad stock injector.

Once the plenum is removed, it is a fairly simple task. There are four bolts holding down the fuel rails.
Since the fuel rails are connected in a loop by tubing on one end, we want to remove all four bolts so as
not to provide undue stress on the flanges for the piping on the rail end.
The photo on the right will show I have removed all four blots to the fuel rails and lifted the rails and
injectors out of the bottom seat. All injectors are now hanging freely from the rails.
There are four plastic spacers that divide the rail mounting tabs from their mating bolt hole on the block.
As you lift the rails and injectors, remove these spacers and place them on the side for safe keeping.
If you knock one of them off while you are working and it falls down into the abyss, you will be stuck with ordering
one from the dealer, so better safe than sorry, they are not on there very tight.
For this lets assume that the #1 injector needs replacement as shown below in the photo on the right. Push downward
on the injector removing it from the rail with the plug still attached to the injector. Once up and able to be worked on
remove the keeper spring (U shaped Clip) from the plug as shown below, taking care not to drop it. I found a small
screwdriver prying up on the spring front center starts it's removal. (This is shown in photo #4 below) It is pretty stiff
as it is hardened steel and retains pressure inward on the sides of the plug so be ready for it to spring closer together.
In other words it will go from this |_| on the plug to this /_\ when off the plug, so hold on to them tight and don't let go.
Also put them in a safeplace away from the engine compartment in a bottle or something.
Once the clip is removed the plug will come off easily. You have removed an injector. If this is the only one,
replace it with a new one and reassemble.
The whole job start to finish including the plenum will be about 4 hours if it is your first time. Do it a few times and
you can change plugs, injectors, remove and replace the plenum all in about in 45 minutes.

Shown below is injectors for the rear bank # 2, 4 and 6 cylinder. On the right is shown removal of the spring clip

Shown below left photo, center right, little black round thingy is the lower injector gasket. They can be reused if they are
not dried out or cracked. Replacement to me is wise. Yeah, the whole set upper "O" ring and lower gasket is $18, but
if you get it all back together and you have an injector leak, is it worth the $18? You decide on that one.
I replaced mine.
Upper "O" ring is part # MD614813 Lower "Insulator" is part number MD 087060 I paid $17.40, no tax so figure $20
The photo on the right is showing hooking up all the injectors to the electrical before installing them in the fuel
rail. This is important because once the injector is installed it is almost a juggling act to replace the clips.
They are hard enough to hang on to replacing them before you reinstall the injectors. Do this first, take my advice.

 

On the left is the completed job with all new injectors,, well almost,, hehe
On the right,, yeah you guessed it, I painted the rear valve cover,, why not?? How often are you going in there?
Do that and maybe your engine will look like this after 10 years and 108k miles with 200k more to go.

Just replace your Plenum and you are in business!!
 
 

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Photos and text Copyright John C. Adams  Use prohibited without authorization.
For questions send e-mail   Last Update 08/02/00