I'm going a little crazy trying to figure this out. Car will not start at all, all of a sudden
Just installed a DIY turbo system. LT1/T56 swapped third gen camaro. 78mm VS racing, I did the hotside and cold side.
New parts also include a 340lph in tank pump, and new Siemens 60lb injectors along with requisite turbo stuff.
Yesterday was the first chance to drive it with the new setup. I had a safe tune on it, and took it out for a drive just to see how it drove putting around. It did fine. A/F was about where it used to be when it was NA. I had been using a 2 bar MAP tune for the last month or two, to prove that it would work OK, and it did. Drove home parked it, no issues.
So, after driving a bit, I came back, added a different crankcase breather, made a gauge pod and installed the boost gauge, and was ready to go tuning a bit. In the midst of that, a friend dropped by so I started it for him just for fun. Started and run fine.
Then after the gauge was all installed, I try to start the car and it started for maybe 1-2 seconds and then died. After that, all she will do is crank, maybe get a little fire every once in a while. Not very often.
The odd thing is: the first time it failed to run, it did start for just a brief couple seconds before shutting down, then won't do much. Get a pop once in a while.
Used the GM service manual to check a few things.
Check engine light is on, while engine doesn't run. GM manual says this is normal.
No DTC's found per Scan9495 and also TunerProRT.
I do see an injector fault, but it has been like this ever since the motor was built, and never caused any issues. I have asked about it before, but haven't been able to identify a real issue, and so just let it be.
I happen to have a second ECM, which delivers the exact same results.
fuel pressure when key is on is 50psi, little high, but that's probably because of the 340lph pump in the tank and stock 5/16" return line.
Have 12 volts at the injector connectors, fuses OK. Also noted blinking test light while cranking, so that system I would say appears to be functioning. Also still think it smells like raw fuel after cranking.
Thought perhaps it was flooded somehow, but you can't floor it to clear it out, or pull the inj. fuses to clear it either. I pulled a couple plugs as well, and they weren't really wet with fuel, and no fuel poured out of the cylinder or anything.
Measure all on right bank, all exactly 12.3 ohms. They have about 15 minutes run time on them.
I have not yet swapped back to the Bosch DIII 32 lb units I used to run to see what that does.
Using the Scan9495 program, I can see that the opti appears to be giving signals to the ECM.
I checked spark at #2 with a inline spark tester, and can see some light there, so it also appears to be functioning.
I tried the old 1 bar tune with 1 bar sensor that worked well, along with a change to proper injector flow. Still nothing
Tried the old 2 bar NA tune that worked well, etc., still nothing.
Tried reducing the cranking fuel pulsewidth - no help.
Tried increasing injector flow rating to lean it out - no help.
SteveO on the GearheadEFI applied a patch to the 2 bar tune for baro update disable. But, I've tried tunes with the patch, and back to the old tune without just to see. Nothing . . .
The only thing I can think of is it's in the opti somehow. Not triggering the ECM at the proper time or something. Odd that it would just fail all at once?? Per the scan program it appears to work? I think it's an original GM opti, with about 150k on it. Up till now it's been flawless. No leaks from water pump, I don't drive this car in rain.
I'm not sure what else to try. The injectors are new in the equation, as is the fuel pump. I can't see how the pump is doing all this. If the injectors decided to all leak or something I guess that could do it? I haven't run the car long at all with the Siemens 60's, but I did drive it for at least 10-15 minutes yesterday morning. So the tune / values etc. were working. A/F wasn't way out of whack either.
I haven't been through the "Hard start" section in the GM manual yet. Guess that's next.
Sorry for the book, my sincere thanks for anyone that can help me out. I wanna hear this damn turbo just once!!!