Lifter replacement, then again soon after - Hybrid 08 Tahoe LFA
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Lifter replacement, then again soon after - Hybrid 08 Tahoe LFA
August 22, 2020:
- after 3 hrs on the highway, CEL blinking.
- Scanned P0301 code at 297050km or thereabouts.
- Changed Coil, spark plug for AFM cylinder 1, no change, still missing.
- Engine very rough due to misfire.
- Repair done at 297131: problem diagnosed as Cylinder 1 AGM lifter collapse. Entire driver side bank lifter and head gasket and other gaskets replacement. Camshaft OK, no wear.
Oct, 24, 2020:
- Tahoe at 298000km or thereabouts.
- No issues, noticed what I think was chevy shake at or above 110kph, but would be on or off.
- Same thing that was the warning sign the first time.
- Truck rested for 2 days before next use.
- On the highway for 1.5 hours going 110kph or so, CEL comes on and blinks, but there is no sign/shake of a misfire.
- Read P0301 code AGAIN (this lifter was replaced), as well as P0521 code (At this point I'm super pissed that the repair didn't change anything)
- Pulled over, stopped the engine.
- Started again, no problems. Then CEL blinks on again, and the Oil Light blinks.
- I notice the oil pressure gauge steadily and quickly falling to 1/4 as I'm driving on the highway.
- OBComputer tells me to immediately stop the engine due to dangerously low oil pressure.
- I check oil levels, all OK. I start driving again, and oil is perfectly within the normal range, then 10 minutes starts steadily falling again, to 1/4 on the gauge, and CEL starts blinking again. I pull over, repeat an engine stop again, get back on the highway, and then go. CEL stays on solid but no longer blinks, oil pressure is fine, but then steadily starts going down again.
- 20 minutes later, the engine starts shaking hard, for a misfire. Then, after getting off the highway, the engine does auto-stop at a light, and then when restarts, no misfire.
- In city driving, no oil pressure issues, CEL light is on but not blinking.
What could this be after the f*****g $3k repair that the same thing happens again?
Is it the AFM system? It's a 6.0l V8 LFA Vortec with AFM on lifters 1, 4, 6, 7 on a 2008 Tahoe Hybrid 4x4.
- after 3 hrs on the highway, CEL blinking.
- Scanned P0301 code at 297050km or thereabouts.
- Changed Coil, spark plug for AFM cylinder 1, no change, still missing.
- Engine very rough due to misfire.
- Repair done at 297131: problem diagnosed as Cylinder 1 AGM lifter collapse. Entire driver side bank lifter and head gasket and other gaskets replacement. Camshaft OK, no wear.
Oct, 24, 2020:
- Tahoe at 298000km or thereabouts.
- No issues, noticed what I think was chevy shake at or above 110kph, but would be on or off.
- Same thing that was the warning sign the first time.
- Truck rested for 2 days before next use.
- On the highway for 1.5 hours going 110kph or so, CEL comes on and blinks, but there is no sign/shake of a misfire.
- Read P0301 code AGAIN (this lifter was replaced), as well as P0521 code (At this point I'm super pissed that the repair didn't change anything)
- Pulled over, stopped the engine.
- Started again, no problems. Then CEL blinks on again, and the Oil Light blinks.
- I notice the oil pressure gauge steadily and quickly falling to 1/4 as I'm driving on the highway.
- OBComputer tells me to immediately stop the engine due to dangerously low oil pressure.
- I check oil levels, all OK. I start driving again, and oil is perfectly within the normal range, then 10 minutes starts steadily falling again, to 1/4 on the gauge, and CEL starts blinking again. I pull over, repeat an engine stop again, get back on the highway, and then go. CEL stays on solid but no longer blinks, oil pressure is fine, but then steadily starts going down again.
- 20 minutes later, the engine starts shaking hard, for a misfire. Then, after getting off the highway, the engine does auto-stop at a light, and then when restarts, no misfire.
- In city driving, no oil pressure issues, CEL light is on but not blinking.
What could this be after the f*****g $3k repair that the same thing happens again?
Is it the AFM system? It's a 6.0l V8 LFA Vortec with AFM on lifters 1, 4, 6, 7 on a 2008 Tahoe Hybrid 4x4.
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