Recent content by 0x_2a
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Metallic Rattle While Accelerating - Dealer Can't Reproduce (video)
It's a stuck lifter. Reproduce it in park, and rev around 1700RPM and 2200RPM. WHACK WHACK WHACK WHACK WHACK. That poor camshaft is getting beat to hell with a stuck lifter. Good luck getting authorization for a fix. I've been fighting to get it fixed for months now. I found a dealership where...- 0x_2a
- Post #13
- Forum: Engine & Drivetrain
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Yukon Engine Failure - Buyback?
@jfoj here's the legal blurb, it's a settlement, they refused buyback. I paid $100K for it.... now probably is worth 70s? How many miles now? Over 30K. @blanchard7684 Is that on start up or constant? Constant, always. Loudest at 1700RPM and 2200RPM. Also, the motor runs hot. I'm...- 0x_2a
- Post #21
- Forum: Engine & Drivetrain
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AFM/DFM Disabler for 2025 models
Folks its the same question, same answers since "Global B" started rolling out ECU's form 20-23. The ECU is encrypted. Still, as of now the only way to do it is 2 things: 1. Send in your ECU to get a custom unlocked one, (e.g. L87 E90 ECU's...- 0x_2a
- Post #10
- Forum: Engine & Drivetrain
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Yukon Engine Failure - Buyback?
My 2023 failed at 18K miles. Two failed lifters. Motor replaced. Then 7 more service visits after due to head gasket leak, valve cover leaks, and exhuast leaks. Opened lemon law case in Ohio (purchase state). 4 months later they responded, offered me $5K cash, argued, they came up to $6.5K cash...- 0x_2a
- Post #18
- Forum: Engine & Drivetrain
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2023 6.2L L87 Engine Defect Bulletin! Yukon/Tahoe/Escalade/Suburban/Sierra/Silverado
Another recall I saw had numbers to call... Cadillac 1-800-333-4223 Chevrolet 1-800-222-1020 GMC 1-800-462-8782- 0x_2a
- Post #6
- Forum: Engine & Drivetrain
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2023 6.2L L87 Engine Defect Bulletin! Yukon/Tahoe/Escalade/Suburban/Sierra/Silverado
No, but for prior years I've seen - 2022 Main Bearing Cap Bolt Defect, i.e. bad torque on the bolts, misaligns the crankshaft - 19-23 Oil Pump Defect, i.e. bad tranny-oil gears, bad oil pressure, bad lifter activation- 0x_2a
- Post #3
- Forum: Engine & Drivetrain
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AFM/DFM on 2022 Tahoe?
Good News - It is Now Possible Bad News - You probably don't want to - Lifters are failing from parts outside DFM - It voids the warranty - Requires 20+ hours from a "very" experienced mechanic who can spot other defects that might be in the motor Lifters Failures Without DFM, from a GM Master...- 0x_2a
- Post #19
- Forum: Engine & Drivetrain
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Has anyone experienced this engine noise '21 or '22?
Update! Sound Narrowed Down to Two Parts in the Exhaust Line 1. Flapper Squeak (easy fix, see below). - Locking the flapper open stopped the very-high squeak on my 23 Yukon 6.2L L87. - First check if your flapper squeaks by quickly rotating it (hot part, wear gloves) - Take a video to see...- 0x_2a
- Post #49
- Forum: Engine & Drivetrain
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2023 6.2L L87 Engine Defect Bulletin! Yukon/Tahoe/Escalade/Suburban/Sierra/Silverado
GM did not notify me, but my VIN was on the list. You have to call and ask. Sent out in April 2024: https://static.nhtsa.gov/odi/tsbs/2024/MC-10253536-0001.pdf 2023 L87 ENGINE-GAS, 8 CYL, V8, 6.2L, DI, DFM, ALUM, GEN 5 Cadillac Escalade Cadillac Escalade ESV Chevrolet Suburban Chevrolet...- 0x_2a
- Thread
- Replies: 5
- Forum: Engine & Drivetrain
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Has anyone experienced this engine noise '21 or '22?
Found a video of the flapper delete on the 6.2L L87, the sound is gone after delete. I'm going to try forcing it stay open.- 0x_2a
- Post #47
- Forum: Engine & Drivetrain
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2023 Yukon Denali - 1700 miles failed engine
More people need to know about this bulletin, GM has not notified any owners. My block failed at 29K. https://static.nhtsa.gov/odi/tsbs/2024/MC-10253536-0001.pdf- 0x_2a
- Post #10
- Forum: Engine & Drivetrain
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Engine Issue 2023 Yukon Denali 6.2L only 4k miles
Most states require the vehicle in the shop for 30 days to be eligible for lemon law. I just went through this, full block replacement at 29K miles. Total time in the shop was 3.5 weeks, 2.5 block backorder wait, 1 week repair time. I think more 2023 L87 folks should be aware that a bulletin...- 0x_2a
- Post #7
- Forum: Engine & Drivetrain
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Has anyone experienced this engine noise '21 or '22?
My brand new 23 Yukon Denali Ultimate has this sound. Asked about it on the lot, they said they all do that under 1500 RPM. Slightly jerky 2nd gear on acceleration too (pedal 30-40% down). Will poke around, sounds more like exhaust system than belts to me.- 0x_2a
- Post #28
- Forum: Engine & Drivetrain
