Fuel Injector(s) Replacement

[jay800]

1999 100,000km (62,000 miles)
If anyone has replaced fuel injector, I’d like to ask a few questions. I could probably pull this off with some guidance.
On another forum, I was advised of possible fuel injector issues…my dealer concurs but I’d rather do this myself if I can, based on the fact that they have not been able to solve my problem after three visits.

Is this relatively easy, or should I leave this to the experts?
Do you typically replace one, or all 8? The kit below is fairly inexpensive.
Are there adjustments to make pre and post install?

The AC Delco site has the following parts listed that are probably needed.
217-450 SEAL KIT,F/INJR(O RING)
217-308 INJECTOR KIT,SEQ M/PORT FUEL

Thanks. Any help is appreciated.

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Background: The following I was writing back to a guy the exact same issue. His next move after replacing FPR/plugs/wires/coils/ignition module/pvc valve/oxygen sensor was to look at the fuel injectors…. Another respected guy on the forum suggested a leaky or faulty fuel injector also.

I still have the exact same problem as you, even down to the pronounced hesitation at 1500 rpms in 4th. My dealer can't find a solution, but they can sure see the errors on the read-out. I even told them about the type of work you have had done. I have replaced plugs, problem reoccurs within a day or two. Replaced wires, problem reoccurred within a day. Have never had computer indicator LED come on at all.
Codes show misfire in Cylinder #3, replaced that plug again due to carbon tracing, problem has returned.
The funny thing is all of the attempts seem to work for a little while then something causes carbon traces on a particular plug or wires to quickly build-up, then eventually cause the hesitation/misfire again.
The dealer is ruling out coils/control module – they check out fine. They mentioned that my K&N air filter (oil based) may have gummed-up the sensor inside the mass airflow, but I have had that filter for a couple of years. If that was the problem then you would think that a problem like that would be there all the time – it wouldn’t temporarily disappear after the plugs/wires are changed. They did mention possible fuel injectors, but same as mass air flow sensor – problem would be there all of the time regardless of new plugs/wires.
Any way, not sure what to do and don’t want dealer to perform unnecessary work $$. Hopefully you have had some luck since your last post.

[zimaad]

Injectors are something you could do yourself. They are not hard at all. Make sure you get new seals/rings to go along with them. Before installing each one...put a little oil on the seal to let it slide on easily into the injector slot. Also, maybe most importantly, make sure to bleed off the fuel pressure before you start taking off injectors.

Also, hesitation issues are a common one....heck I'm havin that problem with my car! Can be a number of things...I replaced wires, plugs, a coil (I has misfire cyl 5), cleaned my EGR valve, and fuel pressure regulator...coil and plugs is what did the trick. However, I think the underlying cause is an intake leak which I still need to fix. I also picked up a code reader which helped me out a lot. The way I see it... I did all of this for what a shop would charge me for just one thing.

[SublimeZ31]

i think zimaad made a good choice by getting a code reader... thats a good way to start fixing things you KNOW arent right, and start narrowing down things to solve your hesitation issue. and yeah, dont forget to relieve pressure on the rail before you start, i got a nice load of gasoline in my face once when i didnt relieve it all the way haha.
as far as the replacement, i havent done this on a 'rora, but my Z was definately easy, i had a place in indy make me a set of ridiculous injectors, they just HOSED the fuel in. i replaced all of them, but then again, i was upgrading. i guess it depends on how much you can afford... my philosophy tends to be "if one is shot, the rest might be on their way..." so i would think about doing all of them.
i say go for it yourself, follow zimaad's suggestions with seals and oil, it makes them slide in a lot easier, and you run less risk of screwing up the seals (pain in the ass)

also, how much are you paying for the injectors?

[jay800]

Thanks guys for the responses…. much appreciated.

I am glad to hear that there is no special fine-tuning or adjustments to be done on the injectors. The local part store has the kit for $122.00 Canadian, I didn't ask about the seal kit.

When I replaced the FPR, I also got fuel all over the place. How do you pinch/bleed the line?