Truck update

[carlton_fritz]

Originally Posted by Torqaholic

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.

You can thank the .gov.

[Yadkin]

Originally Posted by aerovette

Well I'll be damned. A woman that fixes her own car. Good for you.

Wrong again. Why are you always wrong?

[Bill]

Originally Posted by aerovette

I got a call this morning from the shop. My truck is back together and seems to be running well. They want to keep it over the weekend and put some miles on it and make sure there are no issues. The only thing of concern is the mention of "scratches" on the cam, but they don't think it needs any further attention. I need to get that statement in the paperwork I receive so that if the cam fails and/or takes out the lifters, I will be covered again.

Total charge is at $0.00

Road trip down to Reynosa for some Latina hookers and cock fighting wagering!!!!!

[Aerovette]

Originally Posted by bill_daniels

Road trip down to Reynosa for some Latina hookers and cock fighting wagering!!!!!

Truck's seeing more action than me.

[DJ_Critterus]

Originally Posted by aerovette

Truck's seeing more action than me.

[aerovette] I fapped so good last night and when I woke up, my dick was in the kitchen making me breakfast for a job well done [/aerovette]

[Aerovette]

Originally Posted by DJ_Critterus

[aerovette] I fapped so good last night and when I woke up, my dick was in the kitchen making me breakfast for a job well done [/aerovette]

If my dick knew how to cook, I'd have never gotten married.

[DJ_Critterus]

Originally Posted by aerovette

If my dick knew how to cook, I'd have never gotten married.

[ptindall]

Wrecked lifter puts a lot of metal through the engine. I suggest you sell it once you get it back.

[Yadkin]

Originally Posted by ptindall

Wrecked lifter puts a lot of metal through the engine. I suggest you sell it once you get it back.

Would you tell the buyer this?

[GTOguy]

Originally Posted by ptindall

Wrecked lifter puts a lot of metal through the engine. I suggest you sell it once you get it back.

And it's surface-hardened metal at that. The worst type of metal to run through and engine, as it has zero 'give'.

[Aerovette]

My understanding is that lifters are made softer so as to be the sacrificial part if shit goes south. I do want to get something from the shop that assures me that they will stand behind their decision NOT to change the cam.

If they gave me an option and I said no, then I own it, but they went forward with the old cam without discussion. They told me they were pulling it last Monday, but I was at their shop peeking through the bay doors and the radiator was in the truck, which means the cam was too.

[LATB]

Originally Posted by JetMechZ16

$12K for and engine replacement?? That is insane.

I know a guy who put DEF in his fuel tank. 14 grand for the fix. (So I’m told)

[09CTSV]

The old place I worked at we went thru 4 engines because the put DEF in the diesel and then diesel in the DEF. JD 544 and 444 loaders, $24K per engine without labor.

[Yadkin]

Originally Posted by aerovette

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.

Nice cut and paste. I'm sure the author of what you plagiarized would be pleased.

https://www.gm-trucks.com/forums/top...omment=1056259