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Old 06-21-2022, 9:52pm   #1
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Default Truck update

My truck's been in the shop for a couple weeks. It started running like crap and then tapping loudly. Shop quoted $12k to replace the engine saying they suspected a rod knock. Fast forward/skipping details and debates...They pulled the head and found a failed lifter and two bent push rods.

...in the head they worked on. Under the old management and a now fired mechanic, the lifter they replaced last year was done incorrectly. I'll be getting head done, new cam, new lifters, etc on their dime. They owned up to it. I was very pleasantly surprised.
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Old 06-21-2022, 9:56pm   #2
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Old 06-22-2022, 5:31am   #3
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Old 06-22-2022, 5:35am   #4
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Was it an independent mechanic or a dealership?
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Old 06-22-2022, 6:17am   #5
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What kind of truck? Year? Chevy has lifter issues. Thatís why I ask.
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Old 06-22-2022, 6:43am   #6
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What kind of truck? Year? Chevy has lifter issues. Thatís why I ask.
Chevy has lifter issues? The only time that I had bent lifters in the 454 on my '90 C3500 was when the timing chain broke.
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Old 06-22-2022, 7:06am   #7
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Chevy has lifter issues? The only time that I had bent lifters in the 454 on my '90 C3500 was when the timing chain broke.
Oh yeah. Newer engines however.
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Old 06-22-2022, 7:38am   #8
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Chevy has lifter issues? The only time that I had bent lifters in the 454 on my '90 C3500 was when the timing chain broke.
Supposedly the displacement on demand fuel efficiency scheme causing problems. They cut off function to half the cylinders while you're cruising down the road. I spent $100 to bypass that with a gizmo that plugs into the OBD port... If I wanted to drive a 4 cylinder I'd have bought a 4 cylinder. Dumb asses.
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Old 06-22-2022, 7:41am   #9
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Oh yeah. Newer engines however.
That's why I stay with the oldies. '90 Chevy Dually, "92 Camaro and '97 Buick Supercharged Riveria. Wife has an '18 Buick.
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Old 06-22-2022, 7:56am   #10
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Supposedly the displacement on demand fuel efficiency scheme causing problems. They cut off function to half the cylinders while you're cruising down the road. I spent $100 to bypass that with a gizmo that plugs into the OBD port... If I wanted to drive a 4 cylinder I'd have bought a 4 cylinder. Dumb asses.
The lifter issue is tied to the DFM; Dynamic Fuel Management tech. Iím looking into this as Iíve got an affected engine - the 6.2. Range Technology makes one for my truck.

So far, Iíve got 10k on my truck and alls well. I was told by a service manager at a Chevy dealer if youíre gonna have it, itíll be before 15,000 miles.
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Old 06-22-2022, 9:44am   #11
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Was it an independent mechanic or a dealership?
A local shop, but part of a chain. Caliber Auto Repair.

They have done right by me historically. Both people involved with the bad lifter install are fired. The old GM and the mechanic.
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Old 06-22-2022, 9:46am   #12
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What kind of truck? Year? Chevy has lifter issues. Thatís why I ask.
It is the DOD/AFM shit that messed up.

The plug in bypass gadget does little to help since the lifters themselves are crap and the plastic guides still fail as well.
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Old 06-22-2022, 10:26am   #13
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$12K for and engine replacement?? That is insane.
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Old 06-22-2022, 11:39am   #14
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$12K for and engine replacement?? That is insane.
$6300.00 for the engine from GM (good luck actually getting one. No supply)
Over 30 hours of labor to R&R.
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Old 06-22-2022, 1:17pm   #15
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It is the DOD/AFM shit that messed up.

The plug in bypass gadget does little to help since the lifters themselves are crap and the plastic guides still fail as well.
My understanding is, when the AFM/DFM is engaged is shuts down cylinders. (This I knew) When it disengages and fires up all 8 cylinders the lifters are hanging or seizing up altogether.

GM does have a service bulletin out on this, they're well aware of the problem.

Now, how about you fuking' FIX it you assholes.
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Old 06-22-2022, 1:27pm   #16
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$12K for and engine replacement?? That is insane.
It's costed some GT350 owners upwards of $30k for a new engine.
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Old 06-22-2022, 1:47pm   #17
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My understanding is, when the AFM/DFM is engaged is shuts down cylinders. (This I knew) When it disengages and fires up all 8 cylinders the lifters are hanging or seizing up altogether.

GM does have a service bulletin out on this, they're well aware of the problem.

Now, how about you fuking' FIX it you assholes.
General Motors Active Fuel Management engine control system has the ability, under certain light load driving conditions, to provide maximum fuel economy by deactivating 4 of the engines 8 cylinders. The engine will normally operate on 8 cylinders in V8 mode during starting, idling, and medium or heavy throttle conditions. When commanded ON, the engine control module (ECM) will direct the active fuel management system and deactivate cylinders 1 and 7 on the left bank and cylinders 4 and 6 on the right bank, forcing V4 mode. Refer to Lubrication Description and Cylinder Deactivation (Active Fuel Management) System Description.



Valve Lifter Oil Manifold Assembly



The valve lifter oil manifold assembly is bolted to the top of the engine block beneath the intake manifold assembly. The oil manifold consists of 4 electrically operated and normally-closed solenoids. Each solenoid directs the flow of pressurized engine oil to the active fuel management intake and exhaust valve lifters. The active fuel management oil pressure relief valve, located in the oil pan, regulates engine oil pressure to the lubrication system and the oil manifold.



When enabling conditions are met for active fuel management operation, the ECM will ground each solenoid control circuit in firing order sequence, allowing current to flow through the solenoid windings. With the windings energized, the solenoid valves open and direct pressurized engine oil through the valve lifter oil manifold into 8 vertical passages in the engine block lifter valley. The 8 vertical passages, 2 per cylinder, direct pressurized oil to the valve lifter bores of the cylinders to be deactivated. When vehicle operating conditions require a return to V8 mode, the ECM will turn OFF the ground circuit for the solenoids, allowing the solenoid valves to close. When the solenoid valves are closed, remaining oil pressure is exhausted through the bleed passages of the valve lifter oil manifold into the engine block lifter valley. The housing of the oil manifold incorporates several oil bleed passages that continually purge trapped air from the manifold and engine block.



To help control contamination within the active fuel management hydraulic system, a small replaceable oil filter is located in the valve lifter oil manifold oil inlet passage. The oil pressure sensor monitors engine oil pressure and provides information to the ECM.



Active Fuel Management Valve Lifters



When operating in V8 mode, the active fuel management valve lifters function similar to the non-active fuel management valve lifters. The active fuel management oil manifold solenoids are in the closed position, with no pressurized oil directed to the valve lifters. The pushrod travels upward and downward to actuate the rocker arm and valve. The spring loaded locking pins of the lifter are extended outward and mechanically lock the pin housing to the outer body of the valve lifter.



When the active fuel management system is commanded ON, the ECM will direct the solenoids of the oil manifold to open and direct pressurized oil to the valve lifters. Oil travels through the valve lifter oil manifold and engine block oil galleries and enters the inlet port of the valve lifter.



When operating in V4 mode, pressurized oil forces the locking pins inward. The pushrod remains in a constant position and does not travel upward and downward. The outer body of the lifter moves upward and downward independently from the pin housing. The valve lifter spring retains tension on the valve train components to eliminate valve train noise.



When the active fuel management system is commanded OFF, the ECM directs the solenoids of the oil manifold to close, stopping the flow of pressurized oil to the valve lifters. The oil pressure within the lifter will decrease and the locking pins will move outward to mechanically lock the pin housing and outer body.



The active fuel management engine block incorporates additional features to support active fuel management system operation. Engine oil pressure is routed to the valve lifter oil manifold assembly from an oil gallery in the rear of the cylinder block. Cylinders 1, 4, 6, and 7 each have 2 vertical, cast-in-block oil passages . The vertical oil passages permit oil flow from the manifold assembly to the valve lifter bores.
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Old 06-22-2022, 4:07pm   #18
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How much money was spent, screwing up a perfectly good design!
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Old 06-22-2022, 4:45pm   #19
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How much money was spent, screwing up a perfectly good design!
No shit. Small block Chevy engine that's reliable and been around forever? Let's see if we can screw it up.
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Old 06-22-2022, 6:38pm   #20
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I remember your folks RV trip from years ago
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