Once I again I owe THANKS!
Yep, since you drive an 05, to swap the ECM you need a dealer with a Tech II to synch up all the modules (PIM?, etc). But id bet money thats what it is.
Hmm, never knew that about the computer swap (having to use the Tech II for more than CPS and CKPS programming). That kind of blows ... I've got a thing or 2 left to try (will look into powering the injectors as KTG suggested ... though I swear all the injectors are receiving a neg pulse from the computer).
Curious, does anyone know the going rate for an ECM in these cars and what's a TECHII re-write generally run? I'm guessing none of this can be done with HPT? I ask because my car currently has a "Tune By Chuck"
(was done a few years back when I installed the cam, UDP, LT's and Svede intake) and I'm going to need to see him again as well I guess.
I dont have a wiring diagram in front of me, but its hard to imagine a wiring fault only effecting two half banks. Common grounds per bank and all that.
I have, for the most part, a complete service manual on file
I scoured that thing for hours while working in Woodward Ok. last month (not much to do when sitting in a hotel room). The injector/coil wiring is per bank (pretty simple layout). Nothing correlates on why only the back 4 won't fire.
Ive honestly never seen something like this. Ive seen plenty of stupid shit that shouldnt happen. but not this.
Wow, that makes me even less enthused about finding the issue. I respect the fact that you're an actual Technician (that diagnoses these things regularly I take it). Yet you take the time out to come chat about cars on here (that would be akin to me being on Wind Turbine sites discussing parameters ... which I never do, LOL).
I'm going to take some measurements to/from the computer to each injector plug > < computer pin. I highly doubt 4 just all of a sudden had an increase in resistance. But I do want to say I crossed all my "t's and dotted my i's.
Things that are new and different excite me. this gets a bonus for being really smurfing weird.
Well I propose a trade and sign with ya. You can have this one and I'll take your running one ... No questions asked
If the injectors fire when being powered at teh ECM connector, and the ECM powers and grounds are good, Its 99.999% certain its the ECM at fault. that missing .001% is from the fact that nothing is ever certain, and not doing the tests myself. Trust but verify and all that.
I've checked the injector wiring with two different sources. Once with a noid light. Secondly with a computer safe test light. It's simply a 12v powered test light with resistors and LED's. Attach it to positive it lights red. Attach it to negative it lights green. The fact that it has LED's allows it to be used like a noid light to read the negative pulse from the computer to the injectors. The non firing ones all have positive from battery and are getting a pulse from the computer.
For the coils, they are all firing which I verified with my spark tester that goes in line between the coil and plug.
Since i haven't actually measured ohm's between the injector clips and the computer plug, I'm going to do as you suggested (because it takes less than 3 volts to energize a LED so there could possibly be a high resistance. It would allow my Test Light to flash pulses but maybe the voltage is too low to open the injector correctly).
Oh yeah ... On buy a NEW
car ... Not an emo
purchase by me.
have i owned a "new"
car (Dave Ramsey and Tom Martino fan here). My GTO was purchased by me August of 06 with 11K on the clock for $21.5K (financed out at 24.5) I owe next to nothing on the car at this point and it has less than 55K on the odometer.
If I am forced to trade it off, I'd purchase a Vette (07-09 is in my price and payment range) or a 330i Beemer (fun little twin turbo inline 6 and the 07-08 can be had for under 27k with low miles).
I'm really not trying to come off as a know it all or as being better then anyone at anything (though I am better then anyone that doesn't put forth efforts!). I realize how much I don't know every day I live (age does that to you, LOL). BUT
I can do the basic math and if the repairs starting approaching the $3k mark (including rental car at this point) I'd be money ahead to trade it in. Would I get the full value of it, NOPE
but I'd easily get 8K into the trade (have you seen what GTO's are selling for right now ... seems they went up in value for some reason). I was without a car note for 9 years before I bought the GTO and had kinda looked forward to being that way again for a while. But, the best laid plans of Men and Mice ...
Anyhow, no more doom and gloom thoughts (sell car/buy another one) ... I'm going to think positive and hope I discover something this weekend