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Spent 14 hours on a no-start on a 2012 Cascadia that turned out to be a chafed wire behind the fuse box
Truck came in last Monday with a crank no start, I checked fuel pressure, swapped the cam sensor, even pulled the valve cover thinking it jumped time. Turned out a wire harness was rubbing against the firewall bracket and shorting out the ECM power relay, which only showed up when the cab got hot. Has anyone else been burned by a hidden chafe like that, and what's your go-to trick for finding them faster?
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fiona_sullivan2920d ago
Used to figure chafed wires were mostly a wild goose chase and I'd wasted plenty of time chasing grounds that went nowhere, so I'd skip the wiggle test and just throw parts at it. What changed my mind was a similar mess on a Volvo where the short only showed up once everything heat soaked, and a guy showed me how to load the circuit with a headlamp while wiggling harnesses instead of just ohm-ing them cold. Now I do a voltage drop test under load and push on the loom at every bracket and pass-through before I touch a single sensor. Takes twenty minutes and it has saved me from a few of those 14 hour days, though your mileage may vary on how easy the harness is to reach.
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