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8.1L still stalling after crank sensor replacement

Waffeey
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Jac365 Enthusiast

Jac365

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I may be wrong, but I don't think you have a fuel issue. I would replace cam sensor with AC Declo and see if it still throws the same code.

sefiroxx Enthusiast

sefiroxx

Posted
Posted

Sounds like wiring ground problem.
- check your ground points, clean them
- check for critter damage under the fuse/relay box and at the ecu box
- relay going, try swapping around to see if the problem moves.

The cam sensor problem might be a secondary problem. When engine starts to stall, the drop in voltage can cause various systems to throw codes.

Ft, summit a little rich on one side and a little lean I the other. Suggests enough fuel. Pull the FT while driving too verify that ecu is able to adjust above and below 0 when varying acceleration/cruise. That'll confirm fuel pump capability

  • 3 weeks later...
Waffeey Enthusiast

Waffeey

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I found the culprit of my no start! It was indeed a bad cam sensor, the replacement Standard brand one was defective. I found an Acdelco cam sensor at a GM parts dealer, no more code and solved the no start. I still have the same stumbling/stuttering issue even after a new Delphi fuel pump though.

  • 1 month later...
Waffeey Enthusiast

Waffeey

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On 8/30/2020 at 5:25 PM, Waffeey said:

I found the culprit of my no start! It was indeed a bad cam sensor, the replacement Standard brand one was defective. I found an Acdelco cam sensor at a GM parts dealer, no more code and solved the no start. I still have the same stumbling/stuttering issue even after a new Delphi fuel pump though.

FINAL UPDATE: Fixed the stumbling issue! Spark plugs were simply worn out and covered in carbon deposits. Overlooked the simplest thing, stupid on my part but hopefully helps someone else diagnose their issue. In conclusion the original stumbling/stalling issue was worn spark plugs, and my intermittent no start issue was a bad cam sensor. Truck runs GREAT now. Thanks everyone.

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