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Old 09-29-2016, 04:50 PM
Location: North Central Florida
6,218 posts, read 7,738,313 times
Reputation: 3939


Monday morning it started and took me on a short 2.5 mile sojourn to the local wal mart.

Parked for about 25 minutes. Started, went about 1/4 mile down the road and stalled at 45 mph. Sat for about 30 minutes. Would start with a rough idle, and stall again. Started up again after sitting for 25-30 minutes. Went 500 feet, refrain.

Towed home. Pulled fuel filter. Clean gas on the outlet side, black and gritty on inlet side. Dropped tank, pulled fuel pump (new four months ago) sock clean, inside of tank, clean as a whistle, no water, no black grit.
Pulled codes p0102, p0443, p0449, p01345.

Started at the evap cannister. There was some liquid fuel at the tank line. replaced cannister, checked solenoid for proper function. Replaced filter, checked fuel pressure 60lbs, settles back to 51-52 with key off, or stays at 55 until engine stalls, spikes to 60 at moment of shutdown, seems there's no problem there. But original fault continues. Cold start great, idles ok for 4-5 minutes, then shuts down like someone turned the key off. Will start, but feel like running on four or five cyls, before stalling again, throttle unresponsive.

Replaced MAF sensor, no improvement.

Replaced module beside the coil, no improvement. Checked filter again, still clean both sides.

Three wires at MAF sensor, Ground checks good, gets 5.01 V reference from computer on signal wire. Nothing at the pink wire where there should be 12V. Continuity between pink wire and ground. Jumped 12v direct from battery to MAF harness, no improvement.

Where can pink wire be grounded? Possible inside computer itself? Any help or ideas appreciated. Dont really want to throw a new computer at it, unless I'm certain that's the problem.

(BTW, 01 Express 2500, vin M 5.0L vortec, 4l60e tranny, 192K on the clock. Fresh cam sensor, crank sensor, cap, rotor, plugs, water pump, hoses, belt, fuel pump within last four months)


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Old 10-31-2016, 12:00 AM
17,616 posts, read 15,317,330 times
Reputation: 22966
I know this is old, but..

I'd focus on the P1345 as that's the only real one that I can see making the vehicle stall.

But.. your pink wire, if I have the right wiring diagram.. Is coming direct from the fuse panel. 10A ENG 1 fuse

If that pink wire is truly shorted to ground.. Then you should be popping that 10A fuse every time you turn the key as it only gets power when in start/run.
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