I am not sure about the 2015+ design for fuel rails, but on the 2007 to 2014 fuel rails, I did not need any expensive tools at all. I will have to defer to folks that have worked on the 2015+ models on this.
Dealer not honoring warranty work..2018 5.3 Yukon issues
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Bob2C
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From a prior post
Well, it's not too bad. But you're also going to need the high pressure fuel pipe underneath the intake, there's two of them. They are not re useable after they are removed. There is a special tool needed to size the seals on the high pressure injectors as well. The tool is quite expensive and there is no other way to size it. It will tear and leak if you don't have the tool. I just don't know if I'd be too confident in the injector causing this DTC. The misfire monitor would have picked this up prior to setting this particular code. It would have set a P0307 or a DTC related to the injector control. So, in short. You're not going to be able to do this job without the tool.
swathdiver
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Those cat converter temps are not too high, they were just different showing that one side was running hotter than the other. Mine will cool down to 700-800s after idling for a while. It's easy to get them over 1500 degrees acceleratiing mildly onto the highway.
Dmitry, what happens when you hold the gas pedal down so the motor idles at 600 once warmed up?
Dmitry, what happens when you hold the gas pedal down so the motor idles at 600 once warmed up?
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I would probably do the same just because........
smokey_mountain
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James, it smoothes out but not completely, even in N or P I still feel "misses" but side-to-side shaking is gone just a faint feel of a miss. Interestingly enough even after full tank of Exxon, absolutely no change. I will try to replace the plugs and wires. What iridium plugs come correctly pre-gapped, I do not have tools that can gap without damaging iridium coating on plugs, so I need them factory gapped for 2018 5.3L, right now on RockAuto I see no AcDelco parts for it...
HiHoeSilver
Away!
Just a guess, but check 41-110
swathdiver
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Nope, 41-114 for Gen V. 758EE for wires.
"They" say to throw away a plug not gapped correctly. I simply slip a feeler gauge in there to check the gap, if it is off, I might lightly tap it on my wooden work bench top to tighten it up. If too loose, I use a pair of pliers to bend the electrode for more space. Never force the gap setting tool or feeler gauges against the electrode.
smokey_mountain
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Thank you so much, apparently shortage of these plugs everywhere. Out of stock at most reputable retailers.
swathdiver
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Amazon shows both plugs and wires available, though in short supply. Ebay has plenty.
Bob2C
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Advance auto has in store stock of plugs at select locations or ship to home. Use code RMN25 for 25% off. Wires are the cheapest on amazon. Too expensive from advance auto even with the code. Oh and if you have a chase freedom card linked to PayPal you can get another 5% off this quarter by using PayPal to checkout.
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check another state near by also 760C+ is pretty high don't expect it to last very long
925 degrees C . is the max sustained for the modern 3way cats
that is out of spec ,if your not towing or high engine load like 3500rpm
your dumping raw fuel into the cats...
idle is about 450C and 550-600C(AFM bank1 reading only) normal driving on a LEV2 6.0L i'm sure its typical with everyone else with a working engine
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Bob2C
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FYI - The cat is covered under federal emissions control system warranty which is 8 yr/80k miles in the US
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the warranty is voided they are melted.
760c = 1400f and 1900F is about the melting point
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smokey_mountain
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Brent, thank you for pointing it out. I have provided Charles Boyd GMC with detailed problem write up (see below) including cats running high, got home last night and cats running hot complaint was conveniently left out from the work order when truck was returned to my wife. Call me crazy, but this all smells fishy now. They probably know that my truck is suppressing codes and cats will melt or fail soon and if it was logged on the order they would be liable, by not being on the order it is mine to fix when they melt. I cannot explain why dealers leave details of my complaints out. I provided them printouts and logs...
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start using a sound recorder it's a 1 party state..
what is the emissions tier it should say on the airbox
i.e LEV2 LEV3 ULEV SULEV..
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smokey_mountain
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Brent, you advice is truly invaluable! Thank you. This is what I would do from now on - record on my cell, I cannot believe how many times they ignore what I say. Just to make things interesting I called Charles Boyd GMC this afternoon and asked to add cats complaint to the work order, he said, he did not receive anything from my wife and son, and work order is closed and cannot be updated... Just surreal. North Carolina 2019, it is phantasmagoria of horror.
Says who?
smokey_mountain
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swathdiver
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Dmitry, are you saying that your catalytic converters are up over 1200 degrees after idling for say 20-30 minutes after the engine has reached temperature?
I have sat in a passenger seat and watched my cats before. Accelerating on the highway they easily climb up to the 1500s and then begin to slowly cool and at around 70 mph settle into the 1200-1300s on level ground. They'll quickly heat up going over a hill (bridge) and then begin to slowly cool down again.
Myself and @kbuskill have talked about cat temps before and posted our findings somewhere on this here forum.
I have sat in a passenger seat and watched my cats before. Accelerating on the highway they easily climb up to the 1500s and then begin to slowly cool and at around 70 mph settle into the 1200-1300s on level ground. They'll quickly heat up going over a hill (bridge) and then begin to slowly cool down again.
Myself and @kbuskill have talked about cat temps before and posted our findings somewhere on this here forum.
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