Recent content by RET423

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    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
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    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
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    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...
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    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...
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    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...
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    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...
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    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...
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    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...
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    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
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    DOD Delete Theory

    The factory setup is all 16 pushrods are the same 7.397 inches according to GM.
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    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
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    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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    Proper DoD delete oil pump

    The engine I am hoping to pull apart for a delete this weekend has the worse coking in the cylinders I have ever seen in my bore scope but all of the plugs look great, GM coil packs are awesome.
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    DOD Delete Theory

    Well, literally every company that sells the parts says the cam must be changed, that's likely why there is skepticism; I just can't think of a reason why it won't work and this is a rig I bought real cheap just for the engine so I thought I would try it just to test the theory. Nothing to...
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    Proper DoD delete oil pump

    Put a bore scope in the AFM cylinders and the non AFM cylinders and you will see the difference, insufficient PCV oil mist can cause this as well (why catch cans became a thing) but a catch can will cure that issue with the PCV entirely; the DOD system will coke up either way. And that oil psi...
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