Operation Lipstick on a Pig

[fleming442]

I've been doing some testing this morning, and found something funny. The ICM ground has 55 ohms of resistance because of the O2 sensors (unplug 1, it drops to 22 ohms, unplug both, it's perfect 0.00) Is this normal, or should I be looking at replacing the O2s or fixing the ground?

 

[fleming442]

TECHNICAL UPDATE: I moved the ICM ground over to the 12ga. ground wire that feeds the PCM. I now have 14.6v at the crank and cam sensors as opposed to the previous 7v. I still have 5.5 ohms of resistance on that wire; I couldn't get it any lower yesterday. That being said, I have 1.5ohms to the new ground from the ICM to the sensors. It has to be better- fingers crossed! I'm going to lace it all back in, and try another fire..
This was very helpful in diagnosis: http://easyautodiagnostics.com/gm/3.8L/ignition-module-and-crank-sensor-test-3

 

[fleming442]

Hmmmm, while that may have been A problem, it wasn't THE problem. It does seem to be fuel related as I can only achieve 51psi with the regulator vacuum line unhooked. I would think that, if the regulator was fully closed, it should be higher, no? I can make the regulator function with a vacuum pump, and it only seems to drop 2-3psi. That wouldn't account for a weak spring, though, right?

 

[Texas82GP]

Stay with it. You'll get there.

 

[fleming442]

I ordered a new regulator. The list of "common problems" is getting short. If I prime the fuel 3-4 times, it will start for a few seconds. The fuel pump relay is engaged until after it stalls. This is getting very frustrating!

 

[Z48LT1]

I've been doing some testing this morning, and found something funny. The ICM ground has 55 ohms of resistance because of the O2 sensors (unplug 1, it drops to 22 ohms, unplug both, it's perfect 0.00) Is this normal, or should I be looking at replacing the O2s or fixing the ground?

Wait a while. How can a ground wire be resisted by circuitry unless that circuitry is in series with it, in which case it's not a ground wire?

Curious Gary

 

[fleming442]

Wait a while. How can a ground wire be resisted by circuitry unless that circuitry is in series with it, in which case it's not a ground wire?

Curious Gary

Oh, I know exactly what you're saying! I dicked with it for several hours before just cutting my losses (literally), and running a new ground.
The only explanation I could come up with was that the gauge was undersized for the current draw.

 

[DRIVEN]

Let me back up a bit. Starts and runs for 2 seconds and dies still sounds like VATS to me. I ran into this with my Quad4 swap in my 510. It was shutting down injector pulse, not fuel pump. You sure this isn't your situation? Even though they "turned it off", they might have forgotten to turn it off. Stranger things have happened.

 

[fleming442]

Let me back up a bit. Starts and runs for 2 seconds and dies still sounds like VATS to me. I ran into this with my Quad4 swap in my 510. It was shutting down injector pulse, not fuel pump. You sure this isn't your situation? Even though they "turned it off", they might have forgotten to turn it off. Stranger things have happened.

That would explain alot since the pump continues to run. Do you remember the fix for that?
I know there are several things in HPT that can affect the VATS and fuel delivery. I was going under the assumption that if VATS was turned off in the general menu, it would be good to go. I suppose that Fuel Enable may need to be turned off as well. I don't know exactly what ZZP did as the tuner had never done a standalone unit. I'm pretty sure I can get my buddy up to help me, and he'd give me a license to use his HPT. I'd rather change it myself than send the ECM back to ZZ.
Thanks for the info!!!!!

 

[TURNA]

VATS shuts off the injectors not the pump!!!!!!!!