Yeah, which is'nt the case... so I decided to just start over with my troubleshooting, borrowed a better multi meter, and now I'm getting between 12.0 and 12.9 ohms on all the injectors! Perhaps this is what is going on...But, why would all the projectos be reading bad like that? Is there something that would cause it? Would the truck continue to run as good as it does with injectors like that ( it does seem to lack a little power, but that could just be me and my paranoia!) Or, am I just misreading the meter????

 

long shot: do you have a metal fuel rail or a plastic one? Have you ever had the cross over fuel line off, and if you did- did you reuse it or replace it? what did you replace it with?

Ck I think it was, had an issue with debris in the fuel rail causing him intermittent misfiring.. or maybe he was working on a somebody's truck that had that issue.. either way it could be what's happening with you.

it shouldn't be messing with the readings though.. that resistance thing kinda points toward either a commonality harness issue, a weird fuse/relay, or a PCM problem.

 

I've never had it off myself, but that does'nt mean the previous owner/s ever did... The fuel rails are metal, with a hose (I think some sort of high pressure rubber hose?) connecting the two.

So, being that the injectors are reading higher than the tolerance (.00-.1 ohms is what I was told they need to read at and they are reading between 12 and 13 ohms) could that mean that something else has caused them to go bad, say maybe an overload on the system at somet point, bad PCM, etc? I've been trying to pin out the harness and test, so far no issues I can find there... The truck has 172k on it, could they just be 'wearing' down? Again, the truck appears to run very smooth, and drives down the road just fine, except for a slight hesitation shifting to 2nd when your nice and easy (that may be the new tranny I just had installed...won't know for sure until I fix this issue!), unless you are getting on it...then it has no problem shifting to 2nd...

 

that shifting issue sounds like a TV adjustment, or a governor solenoid or speed sensor.. I'd lean towards bad TV adjustment though..

what is the tolerances of the multi-meter you are using? If it runs fine, then it runs fine and I wouldn't worry about injectors.. and at that mileage, they should only need a cleaning.

 

I cannot recall where I read it (its been a few years since I messed with my injectors), but it was something like within one or two ohms, they're fine. Its when one is reading way out of spec that you have to worry/replace. Mine were all 12.0 to 12.5 ohms, if memory serves, but like I said, that was years ago. It also depends on when you tested them, as they should be tested when they are completely cold.

If you had got a reading of 0 ohms or .1 ohms, I'd say replace that injector.

I'd still be looking at the wiring or PCM. An injector or two going bad is one thing, but all of them partially failing at the same time? That'd be one hell of a coincidence.

 

I thought between 0 and .1 was acceptable tolerance, anything higher was bad....? I'm gonna see if my friends brother will let me read his injectors and see what I get. I've read other posts of a single injector out of 8 reading like 14 ohms and needing replaced. I still can't find anything wrong with the harness itself either. So, I'm pretty sure it's gonna be injectors or PCM, or possibly a ground. There is one flat braided grounding strap on back of block to the firewall beside the PCM, that has to holes from where someone has pushed it onto two bolts on the firewAll, I don't know if that strap could be bad since it's not broke/corroded, just some strands are seperAted from each other.

I'm about to just go ahead and buy a new PCM and injectors, as I'm just spinning my wheels so to speak! Found a reman PCM programmed for 250 with lifetime warranty, and a set of new high performance injectors for about 200.... Got a check coming for some hail damage to the hood that I can use to get the parts, and still get a new hood with.

 

Since you are getting the code on ALL of your injectors.... I would be more inclined to look at the power supply side, rather than the ground side. The PCM provides individual grounds for each injector, power I believe is supplied from a common source for all injectors.

 

Both lines on each injector go back to the pcm. The positivie side on all seem to be on one connector, and the negative side goes into another connector...would'nt this mean the pcm is supplying both positive and negative?

 

Really?? Must have changed things since 01 manual... according to that one, all injectors are powered by a dark green with orange trace wire, that comes from the ASD relay. Not the case???

If both wires for the injectors run back to the PCM, Have a look at the power feed for the PCM, there is probably going to be more than one....... check 'em all.

 

Well, I used a test light to find where the cables go, and both (including the green/orange) ended at the pcm. I could be wrong, but what I was attempting was to read the resistance over the injector with the harness plugged in to it....