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  1. S

    coolant leak passenger rear of L59 engine

    That was the first thing I looked at. First I felt them (dry) and then I looked at them from the underside with my mirror, after I thought about using it. That is not the source this time around, although I used to drive another GMT800 for work and I did see that problem on that one.
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    coolant leak passenger rear of L59 engine

    Ok small stain of coolant under general area of starter. I can see it's dripping off the rear of the motor. I traced it up to the head from underneath. Using a mirror on a stick, I inspected the rear of the head around the freeze plug and it is dry around the plug, but wet on the ledge where...
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    HVAC problem

    Posting because it's happening more often lately. Every once in awhile, the HVAC will go full hot out the vents. Usually this is when AC is selected, but I think it has happened once when heat was already selected. When it happens, the control panel doesn't respond to any inputs. Shutting...
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    Wife overheated the 2005. . .

    Another update. I've heat cycled it three times now. Lost some coolant level after the first one, but I expected that, happens every time you reload the cooling system in my experience. And I did lose about the amount I expected. The second two times, I didn't lose any level. So far so...
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    Wife overheated the 2005. . .

    Another update: I got it put back together. Napa didn't have the non-oil cooler radiator in stock, so if this thing survives this escapade, I have the option of installing the oil cooler lines in the future I guess. Radiator is ready for it lol. I filled it up with coolant, fixed trans fluid...
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    Wife overheated the 2005. . .

    Not a bad idea. And it's right there. I'll pick one of those up as soon as the store opens and I determine if they have a radiator for me.
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    Wife overheated the 2005. . .

    Update: Radiator side tank has a three inch long crack on the left side below the upper radiator hose connection. There was some coolant left in the radiator. Not sure about the engine. So I'm going to do the obvious thing and replace the radiator since I got it out in about a half hour...
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    Wife overheated the 2005. . .

    5.3 Engine is about 5 months old. Professionally installed Jasper engine with a warranty. I do not know how long she ran it hot, because she wasn't watching the temperature gauge. She did say it was pegged when she finally looked at it. I do know that when I arrived, the drain plug was...
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    Hate to do it but I did search first -- oil consumption

    I do have oil on ground. I believe most of that is coming from the hydrobooster though (and I am losing a requisite amount of power steering fluid, which I replenish). The hydrobooster has a leak by what I believe to be an accumulator. I'm sure the engine leaks some oil too, just not all...
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    Hate to do it but I did search first -- oil consumption

    Engine is a 5.3, in a 2005 Z71 suburban, original to the truck as far as I know. It now has 219744 miles. Consumption is a small bit more than 1/2 quart per 1000 miles. Lots of freeway usage on this particular oil change (we are 1000 miles in). I change the oil in this truck every 3000...
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    Had a lifter temporarily get stuck. . .

    Well, to answer several of the above points. Most important, the engine has not made this noise since then, over several hundred miles, so that is good. I have had the valve covers off this engine -- it is quite clean inside with no sludge visible anywhere. So I'm not suspecting dirty as...
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    Had a lifter temporarily get stuck. . .

    I have had the valve covers off within the last ten thousand miles. This engine is actually really clean under there. Sent from my iPhone using Tapatalk
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    Had a lifter temporarily get stuck. . .

    In case it is Germaine to the discussion then, I have never run it on anything besides regular unleaded. Sent from my iPhone using Tapatalk
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    Had a lifter temporarily get stuck. . .

    Do you mean that cylihder deactivation? I don't think so. And it is not a flex fuel motor either, I don't think. I guess I don't know what AFM means. I only know the term in reference to older Bosch fuel injection cars, which have an Air Flow Meter, or AFM lol. And I know this truck has an...
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    Had a lifter temporarily get stuck. . .

    Engine has 216k miles, is a 5.3 L59. Has had oil changes regularly between 3 and 4.5k miles at least since 143.5k miles, when I acquired the truck. It happened while the engine was idling in a fast food lane, and I was able to get it unstuck after leaving the fast food place. But . . . I'm...
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    Stumbling and hesitating 6.0

    An update: After quite awhile, it did finally throw a code. P0300. Not too helpful, but did give some direction. I started with the easiest. Replaced plugs with AC Delco iridiums, and put a new wire set on. I have learned not to start this job on one of these trucks without a new set of...
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    Stumbling and hesitating 6.0

    Thanks I may be at the point of checking that out. Yes I know the fans on the suburban are two speeds. I would assume the Escalade is also since it’s very similar. And I’ll bet there is a high speed fan issue with the Escalade although I need to learn more how that would cause my stumbling...
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    Stumbling and hesitating 6.0

    Spark plugs are about 30k miles old? And wires are the same. I haven’t looked at the plugs but the wires look fine.
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    Stumbling and hesitating 6.0

    Fans run ok at low speed. I am not sure if they kick to high speed or not. I know the suburban's do, and I know what that sounds like, but not sure how to compare by sound. . . It will indicate slighly over 210, but a check with an IR gun indicates 200-205 at water pump and at upper radiator...
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    Stumbling and hesitating 6.0

    9/2004 Escalade ESV. 220k miles. Hesitates and stumbles badly, going from a standing start, usually after idling (and heat soaking) at a light for a few minutes. It does not do it when the engine has been sitting all night. Engine must be fully up to operating temperature, and been there...
  21. S

    Is it common for the oil dipstick tube to fatigue fracture?

    On my work truck. 6.0 escalade ESV. So I go to pull the dipstick out and it gets stuck! So I get it out and then go to reinsert and I notice that it exits the tube about six inches down right where that bracket is. So I feel around that area and sure enough the tube has fractured right...
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    P0455 Code, where to look?

    Actually that was one of the responders. I did actually have an issue with my transfer case "burping". But now that it has new fluid in it, that is no longer happening. And it didn't get on the charcoal canister in my case, only on the gas tank bottom. I'm happy to report that it has now...
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    P0455 Code, where to look?

    Well LOL. Last Sunday I replaced the vapor canister vent valve (with a BWD part). It took until Thurs with it being driven 60 miles a day for it to complete a drive cycle. And when it did, it threw a DIFFERENT code!! P0496. So I got a purge valve straight from the dealer (3 dollars less...
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    P0455 Code, where to look?

    Have not noticed any fuel smell, and not much if any pressure at cap. I knew where the purge valve was located but didn't know where the charcoal canister was located. But you said yours got covered in transfer case oil so it has to be nearby! I'll take a look in there. I guess the purge...
  25. S

    P0455 Code, where to look?

    2005 Suburban Z71 with a 5.3. The code is Evap large leak detected. Reasonably sure it is not the gas cap. I replaced it with a brand new AC Delco part, because the rubber was showing some signs of wear. The code is on its way back (has not set the check engine light, but has put a message...

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