LS Injectors - easy to do?

[Jader1973]

My Commodore has a rough idle and I suspect it’s the injectors (or an injector).

I’ve had a look at the workshop manual, and YouTube and relaxing them looks pretty easy, provided you don’t cause a leak. Is it?

I’d rather avoid paying a small fortune to get someone to do it if it is a simple DIY job.

[stevieturbo]

It will be physically impossible to change injectors and not cause a leak of some sort.

Injectors would be an unusual diagnosis though, unless there has been something to cause them harm.

This kinda shows some assembly. It is not a difficult job by any means, however, if you screw something up and leak fuel all over the place, the consequences can be severe.

https://www.youtube.com/watch?v=D9UwwRuSK9Y

[robbyd]

But don't you just replace the O-ring when an injector has been out?

[stevieturbo]

robbyd said:

But don't you just replace the O-ring when an injector has been out?

Unless you have an actual reason to change them, no.

[fred bloggs]

Jader1973 said:

My Commodore has a rough idle and I suspect it’s the injectors (or an injector).

I’ve had a look at the workshop manual, and YouTube and relaxing them looks pretty easy, provided you don’t cause a leak. Is it?

I’d rather avoid paying a small fortune to get someone to do it if it is a simple DIY job.

Yes , it is an easy job, you can do at home. First crank the engine with the fuel pump relay out to lose fuel pressure, then just swap out tge injector

[fred bloggs]

Jader1973 said:

My Commodore has a rough idle and I suspect it’s the injectors (or an injector).

I’ve had a look at the workshop manual, and YouTube and relaxing them looks pretty easy, provided you don’t cause a leak. Is it?

I’d rather avoid paying a small fortune to get someone to do it if it is a simple DIY job.

Yes , it is an easy job, you can do at home. First crank the engine with the fuel pump relay out to lose fuel pressure, then just swap out tge injector

[Jader1973]

Got the parts from Rockauto for $200 less than I could have got them locally and did them today.

It’s relatively easy. Hardest part was disconnecting the fuel line which was a massive pain even with the special tool. And getting the wiring connectors off the injectors. And getting the protective covers off the injector end of the new ones. And getting the loom off the fuel rail.

Actually it was a massive pain in the arse to do - I will never attempt it again.

However, all back together and no

[Lincsls1]

Jader1973 said:

Got the parts from Rockauto for $200 less than I could have got them locally and did them today.

It s relatively easy. Hardest part was disconnecting the fuel line which was a massive pain even with the special tool. And getting the wiring connectors off the injectors. And getting the protective covers off the injector end of the new ones. And getting the loom off the fuel rail.

Actually it was a massive pain in the arse to do - I will never attempt it again.

However, all back together and no

Nice work!
Did you replace all of them? And did it solve your problem?

[Jader1973]

Yes.

And err…no

I did them first because the general consensus of the internet and the people I know who worked as GM techs is that they are a weak point and most likely to cause rough idle with no codes (Holden extended the warranty on them because they fail).

Plugs and leads next, and if that doesn’t fix it coil packs.

[astonman]

Have you looked for vacuum leaks?
Have you checked fuel pressure?
Is it running lean?
Is it a miss fire?
Plug leads?
Plugs?