Good info Tech, I wanted to mention checking flow rates per injector, but it slipped my mind, got a lot on my mind lately...

Looking back at those resistance readings, I think somewhere in the lifetime of this vehicle, a set of 3 injectors were replaced....

Would make sense Tech, because from what I have heard, and read, the resistance is usually not too far off from the other injectors readings.
If they have addressed everything else like they say, then replacing all 6 would not be a bad idea, at under 25.00 each it won't be too costly.
Probably not worth paying to have them removed, flow tested, then rebuilt and or replaced.
Of course I have only messed with injectors a handful of times, I flushed and reverse flushed a set, and replaced two because the solenoid in two of them clicked a bit quieter then the others, so I replaced it just in case...

If you do replace them all go with the ACDelco 217-307, the Delphi are decent, but for what RockAuto wants for the AC Delco they are more than worth it.

Actually I thought the same thing while I was doing the check! My mother purchased the car new, put about 40K miles on it around town. When she passed away I kept the car. So, it'* possible the dealer worked on the car and she never told me anything about it.

I finally bought another multimeter, Bosh FIX 7665. Was planning to re-check on Saturday but grand kids changed that.

Joel

Thanks for that info. I missed those the other night when I was surfing around looking at options "just in case". Summit has the exact same injector for around $75.00, so I agree that the best deal would be Rock Auto.

And yes, I would replace all 6 if needed.

Joel

OK, here are the readings from today with the new meter:

#1- 12.2
#3- 12.2
#5- 9.4

#2- 12.3
#4- 12.3
#6- 12.3

These were done exactly the same as the first test. I can't even start to explain why the 2,4,6 bank are all that much different today? But, it does show there is one out of range. Possibly this is the cause of that very slight "surge" while in a low/no load condition?

Joel

Number 5 is definitely on its way out. I don’t like idea of just replacing one, the others will usually follow shortly after. IIRC, your 3800 is the 'air gap' style intake (just like my 3300), so changing them however you decide, is only an hour job.

Stay away from the blue set of injector o-rings marketed by Dorman and also sold under the NAPA name. I had them shrink so much I had a vacuum leak and misfire from the air leak into that particular cylinder. After the second failure I pulled the whole set and installed black ones from FelPro.

Yeah it does sound like that injectors solenoid is going bad, not sure if it will cause a surge unless it is letting more gas through.
I know and understand that resistance does not mean a lot to most, but reading this info that I just came across makes it sound like it matters more than we may think.

The solenoid at the top of the injector creates a magnetic field that pulls up the injector pintle when the injector is energized. The magnetic field must be strong enough to overcome the spring pressure and fuel pressure above the pintle, otherwise the injector may not open all the way. Shorts, opens or excessive resistance in the injector solenoid can also cause problems.

Typically, the solenoids often short internally when injectors fail, which causes a drop in resistance. If the specification calls for 3 ohms, for example, and an injector measures only 1 ohm, it will pull more current than the other injectors. Too much current flow to an injector may cause the PCM injector driver circuit to shut down, killing any other injectors that also share that same driver circuit. One way to check the injectors is with an ohmmeter.

If you can get the same brand fuel injector for cheap you can try to replace just the one and see how it goes, as long as you can find one with a very close resistance you should be ok.
I too also would rather replace all 6, or at least give them a DIY flush.
This is kinda how I did mine, you can buy the injector connectors from RockAuto for pretty cheap...

That'* right there is a good way to destroy injectors. Injectors are NOT continuous duty. They are intermittent. If you continue to supply voltage to an injector without some way of cooling it, its gonna toast it.