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  1. R

    OEM parts on Amazon?

    GM has their parts made in China to their specifications, those parts are shipped to GM Dealers But the knock off cheap stuff is then made based on that information, also in china; as is the boxes & printing info from GM Those cheapo parts are boxed in OEM packaging & non OEM packaging, the...
  2. R

    My Yukon Troubles!

    The problem with replacing a 2007 oil pump with one made in 2024 is the new one will be a piece of junk & the old one would have been fine for 3 lifespans of the engine The days of tossing good used parts because your in that area working on stuff is past, there is simply no way to be certain...
  3. R

    Catch Can for 2006 Tahoe 5.3

    Good mod, you don't want engine oil in the intake manifold; it lays there in the low spots then flows toward the intake valves where it starts entering the combustion chamber This creates coking/carbon deposits on the valve face, the combustion chamber of the head & eventually limits the...
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    Idea On Cost To Replace 5.3 Engine? 2015 Yukon XL

    I would check out the driver side head, I think that's where your problem is; if the oil pressure is still strong that is; the leaking injector may have just washed the cylinder wall down & once that's fixed the rings will come back around This is the kind of rig I buy for nothing because...
  5. R

    Coolant Temp Sensor lasts about 30 days

    I would bet you have a bad connection in the the harness at the sensor, bend the tabs a little bit at the sensor connector and plug it back in; if the sensor wakes up you found the problem
  6. R

    What would you do? Truck Needs Engine?

    At 130k that engine is barely broke in, I would definitely diagnose it before replacing it If it genuinely has low compression it won't be the rings at that mileage, likely just crud from the afm or a valve issue, if it has VVT it could be valve timing but I doubt it would be a bad chain at...
  7. R

    I cannot believe it!

    Well, that rig at 20 years old probably has 10 more years left in it with minimal maintenance while a new one will have maybe 5 if you're lucky, that's probably why these old ones are holding their value so well
  8. R

    Breaks Went Out on Me

    Soft brakes is air In the system, very low fluid is a leak in the system; leaks introduce air so you have at least one fluid leak somewhere in the brake system. I don't want to sound mean but driving it for months like that was incredibly dangerous for everyone and indicates a level of...
  9. R

    Power Steering Fluid mixing with brake fluid in brake reservoir.

    The fluid in your power steering/hydrpboost system cannot blend with the brake fluid in the master cylinder, if the brake fluid is contaminated with the wrong fluud it was done by human error
  10. R

    What have i done

    My money is on front wheel bearings, 22's eat them up pretty regularly buts it an easy fix; if you spend the money on Timken bearings for the replacement you won't regret it
  11. R

    Oil Viscosity trial and error

    How long ago did you install the catch can? Is it installed correctly? Is it a sealed can or a vented can? It takes awhile for the oil control rings to free up and start working well after you install a catch can, especially if you didn't remove the intake and dump out the standing oil when...
  12. R

    Cold Air Intake for the most power??

    If you like the look then that is what you will get with a modded intake, your not going to get a power increase on these engines. The factory air intake does not starve the engine for air, it is more than adequate for any HP level under 500. The advantage to cooler air is the ability to run...
  13. R

    High idle

    Usually I would start by looking for a vacuum leak but with that high of an idle you should be getting a code.
  14. R

    diesel Fuel in gas engine

    When it stops pumping just dump another gallon of clean gas in the tank and pump that out to flush the lines
  15. R

    Likely a dumb question, but here it goes. I'm fairly new to Chevrolet, 61 and just bought my first 4 for work and

    The AFM system lasts longer if it is programed to never actuate but the lifters are still a point of failure, a proper delete of all the hard parts is the only way to insure you get the long reliability these engines are known for
  16. R

    diesel Fuel in gas engine

    Do you have a return system or a dead head fuel system in your tahoe? Diesel won't plug anything in a gas system, it just won't run very well or at all if you get to much of it. Your repair is going to be to pump the tank dry, if you have a return system from the fuel rail you can connect that...
  17. R

    Truck smells like farts in the morning

    A rotten egg smell is usually an 02 sensor sending a false lean signal to the PCM, it tries to correct it by adding too much fuel. If you disconnect one of the primary 02 sensors and the smell goes away on cold startup then you found the failing sensor; it will turn on the MIL light but it...
  18. R

    DOD Delete Theory

    Finally got it fired up around 8pm last night, unbelievable how much longer it takes to reassemble in this Envoy chassis compared to the Yukon; this strut style front suspension may be nice to drive but the towers are miserable to deal with for maintenance. Engine runs great, very quiet and...
  19. R

    DOD Delete Theory

    Did the compression test today with encouraging results, test was done with all new lifters that have never ran, no exhaust or intake manifolds installed and no plugs in any cylinder. As I mentioned before all lifter preloads have been verified to be in spec for LS7 lifters. On the driver side...
  20. R

    DOD Delete Theory

    Okay, another update; I keep getting sidetracked so this is taking longer than I thought. I installed the new LS7 lifters, trays and got the heads back on so I was able to check the pushrod length to see if my theory was valid; I appear to be wrong. This DOD engine uses the same pushrod in...
  21. R

    DOD Delete Theory

    I have a partial update, didn't get as much time on the engine as I wanted this weekend but I did get the heads off & lifters out. It was what I was expecting, the only lifter that was stuck was the #1 intake DOD lifter, all 16 lifters had no damage on any of the rollers and the cam lobes all...
  22. R

    DOD Delete Theory

    There is a couple good YouTube videos that disassemble the DOD lifters and show what happens when they fail to reseat in the V8 mode, interesting theory but also becomes obvious why they are such a trouble spot
  23. R

    DOD Delete Theory

    The factory setup is all 16 pushrods are the same 7.397 inches according to GM.
  24. R

    DOD Delete Theory

    That link from LS1tech is one of the threads I read when I got this idea, lots of guys have tried using the DOD cam but I haven't read of anyone trying to use the DOD cam and correct the geometry with pushrod length; I am going to be the Guinea Pig I suppose
  25. R

    DOD Delete Theory

    I think the loss of compression is a lot more than 15 psi on the DOD cylinders if you just swap out the lifters, I was hearing 55 to 60 psi cranking compression from a couple guys who tried it but I wasn't there so I can't verify that; but I doubt 15 psi below normal would register a misfire...

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