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Old 09-07-2017, 09:55 AM   #1
Hotwire
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New direct injection vortec motors?

Besides Mitch ( ), anyone had a chance to check them out?

Co-worker has a 2016 silverado w/ a 5.3 and direct injection. Dam thing is pretty stout. Think it would have given the blazer a really good run for the money even with it being a lot heavier..

He called me last night with a misfire, went and checked it out this morning, cyl #7 not firing, spark plug wet with fuel. It's under warranty so he's waiting on Chevy to pick it up.

We got talking about it and I realized I knew nothing about the direct injection. Did a quick search around and found a decent article on it. I was very surprised at the fuel psi.. I knew diesels ran high pressures but had no idea.

If you're bored:

http://www.superchevy.com/how-to/eng...-get-familiar/
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Originally Posted by Teeleton
Hot wiring is bad news.
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Old 09-07-2017, 02:25 PM   #2
static low 92
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They are very strong running motors in comparison to their OG injected 5.3 counterparts.

I am not sold on it, yet. Purely for having to do regular maintenance to clean carbon off back of the valves, and a few other things.

Im a sucker for tried and true. I still believe the DOD motors total life span isn't going compete with 300k mile old 5.3s
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Old 09-07-2017, 06:18 PM   #3
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I would have to go looking but I took some pics of a DI 4.3 w/VVT at the auto show a couple of yrs a go. thought I posted them here. need to find a new place to host pics as photomucket now want $$ to host.
not sold in the DI myself but I own one.
found the pics and the specs
285 HP @5300 R's
TQ is 305 @3900 R's
11:1 CR
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Old 09-08-2017, 03:47 PM   #4
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I should have taken pics of the 4.3 LV3 I had apart Tuesday. 8000 miles the oil pump grenaded, but only had minor damage to the thrust bearing and crank. Tech assist would only approve new crank and bearings and flush out the metal debris since a new engine was over $5K parts alone. I wasn't very happy. Only pays 13.9 hours but I flagged some extra straight time to clean the metal out, replace the radiator and cooler hoses. Surprisingly it ran great, no noises and good oil pressure.
BTW it has a forged steel crank, the ONLY thing that I was impressed with.
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Old 09-08-2017, 03:52 PM   #5
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They've mentioned something to him about lifter and cam.. Maybe dod lifter collapse?
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Quote:
Originally Posted by Teeleton
Hot wiring is bad news.
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Old 09-08-2017, 05:49 PM   #6
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Could be. I've seen a little of everything, nothing consistent or pattern of failures and actually very few failures overall. Random stuff, collapsed lifters, worn lifter rollers, broken valve springs, cam lobes worn, broken rockers, bent pushrods, and porous head castings. No oil consumption yet....

There's always the possibility of carbon on the valves common on all direct injection engines.

[edit] I have seen a few injectors go bad, most common on #8 for some reason.
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'91 Z70 Bravada lowered 4" 350 Vortec w/TBI, TCI-700r4, KYB's, 9C1 cop car steering gear, rear sway bar, yada yada...
'05 Subaru Legacy wagon (wife's daily)
'04 Subaru Forester XT EJ255 turbo, TBE, lowered 1.5" w/springs
'02 K2500HD single cab 6.0 4L80E 8' plow sander/spreader
Case 580K 4x4 w/chains, 10' power angle plow

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Quote:
"The spirit of resistance to government
is so valuable on certain occasions,
that I wish it to be always kept alive.
It will often be exercised when wrong,
but better so than not to be exercised at all.
I like a little rebellion now and then." -Thomas Jefferson (1743-1826)
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Old 09-08-2017, 07:37 PM   #7
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His had weird symptoms. Struggling with power unless wot, couldn't climb an incline, traction control light on, sounded like it was misfiring through the exhaust. Oil pressure was ok. As far as i went into it before going to work.
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00 ZR2 Extended cab (8BenZR2/Angus), 4wd, Beater Extraordinaire
98 Habanero 2, 5.3L L33 V8 swap Click for project SOLD
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Quote:
Originally Posted by Teeleton
Hot wiring is bad news.
Teeleton
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Old 09-09-2017, 05:58 AM   #8
mkgearhead
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Sounds like broken valve spring.
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-Mitch K

'91 Z70 Bravada lowered 4" 350 Vortec w/TBI, TCI-700r4, KYB's, 9C1 cop car steering gear, rear sway bar, yada yada...
'05 Subaru Legacy wagon (wife's daily)
'04 Subaru Forester XT EJ255 turbo, TBE, lowered 1.5" w/springs
'02 K2500HD single cab 6.0 4L80E 8' plow sander/spreader
Case 580K 4x4 w/chains, 10' power angle plow

To help support this site with a donation click here
My cardomain site
Quote:
"The spirit of resistance to government
is so valuable on certain occasions,
that I wish it to be always kept alive.
It will often be exercised when wrong,
but better so than not to be exercised at all.
I like a little rebellion now and then." -Thomas Jefferson (1743-1826)
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