L83 DoD Delete Help

[Immortan]

Hi all,

I may be in over my head here with this 2016 Suburban Gen V L83. Long story short, my parents use it to chauffer my 98 year old grandma. There were driving it and it just gave up. They had it towed it to the dealer and they informed us that the cam and lifters failed and were looking at $6,000. In an effort to keep it on the road we bought a TSP DoD delete with a stock style DoD delete cam, put it all together, still runs like garbage.

Had a tuner prep me a DoD Delete tune with HPT since that is what I had avail and nothing. I get a weird click no-start sometimes like its hydro locking, smells like fuel, and runs poorly. They are in retirement so money isnt flowing, but they need this to get grandma to and from appointments.

Not sure if you guys can help, I know a lot charge for this but seeing what you think. DoD Delete tune and logs posted. Cheers.

[5FDP]

Did you keep the VVT or no?

[Immortan]

Hey 5FDP,

Thanks for the quick reply. Unfortunately we did as we my dad did not want to do the 0* lockout; it has the VVT and a new L83 Cam Bolt.

Would it be worth the hassle to install a phase limiter or VVT delete?

I appreciate your time and assistance!

[blindsquirrel]

Tune is not going to fix a leaking injector.

Did you see with your own eyes damage on the old cam/lifters that would be consistent with a 'died while driving' complaint?

[Immortan]

blinrsquirrel,

Oddly enough the cam and lifters looked fine; no scouring and lifters weren?t squishy or damaged.

I just don?t know what could be causing the issue at this point then. We replaced the cam position sensor when we redid it.

If you have any ideas, let me know. Thanks!

[5FDP]

He kinda hinted at an injector leaking, it's not uncommon to have these DI injectors fail like that.

[blindsquirrel]

I think it's likely that the dealer misdiagnosed it as cam/lifter failure. Did they do the cam swap using parts you supplied?

[GHuggins]

These were set in that posted log...

P00C6 - Fuel Rail Pressure Too Low - Engine Cranking (Current)
P0300 - Random Misfire Detected (Current)
P0325 - Knock Sensor 1 Circuit (Bank 1) (Current)
P0340 - Camshaft Position Sensor A Circuit (Bank 1 or single sensor) (Current)
P06DA - Engine Oil Pressure Control Circuit / Open (Current

Top 2 are pointing to sticking injectors. Get them replaced as quick as you can. Injectors can cause a complete stall, misfires or whatever. Dealership ripped you a new one with their misdiagnosis... Don't know how they came to the conclusion of needing lifters and cam from a complete engine die.

Cam and engine oil pressure are two possibly left unplugged? You might want a good diagnostic tech to diag the circuit codes first, but looking like injectors among other things now. Possibly even some chewed up wiring???

FWIW that cam requires more tuning than what your texas tooner is doing...

[Immortan]

GHuggins,

Thanks for taking a look at it and giving me something to look at. Do you think it caught two bad injectors originally then kicked it into limp mode? There is a possibility that they could have become damaged when my dad took it apart as well since I was not there, the P/S he couldnt get the rail off. We checked all wiring, cleaned all the grounds, and replaced the sensor on the cam.

I feel it, I could never trust the dealer. I only got roped in because my dad knew I could lend a hand in getting it remote tuned. Unfortunately for my tooner, he never really got a chance because it barely runs due to these issues.

I really appreciate you taking the time to look and provide some feedback; It will give me some stuff to look at. Thank you!

[GHuggins]

As Blind hinted at. It's almost always injectors on these DI motors. Hopefully y'all took the hpfp out when installing the cam and reinstalled the roller for the hpfp to ride on the new cam. Texas Speed always sends clients to the same tooner and he is just that a tooner. He doesn't calibrate anything other than the MAF. I've had customer's talk to me then get talked into using him by texas speed only to come back apologizing for ever using him in the first place Was just afraid he may be the one you're using since it's a texas speed cam.

I'm also assuming you replaced all of the DOD lifters with non dod's, so that isn't a new problem being added into things?

FWIW 80 to 100 K is usually where the injectors may start showing issues. 5.3's usually just wear and start over fueling whereas 6.2's will stick. There's no real filtration and you're forcing non lubricated fuel through a fine opening. It just eventually wears to the point that the pintle sticks. If it sticks open - she dies and won't do much more than fire up and die again. Plan on the coil being fried if this happens to the cylinder with the bad injector stuck open. That's what I've been seeing anyway. Now the ones that stick shut will just misfire. They usually stick shut on cold cold starts. Plus you'll have different amounts of fuel going into different cylinders meaning some will be stronger than others. Again this will show misfires. It will be a really good idea to do a top end soak overnight while the injectors are out. I've actually got a customer right now replacing his injectors and going through the same thing. With the low rail code and the gas smell I'm assuming stuck open or dead cylinder in general. At this point either injector or coil or both due to injector. Do the usual diagnosis. Make sure you have spark and check for fuel. You can technically kill the ignition manually by unplugging the main coil connectors and remove the injectors with rails from the heads then have someone spin it over while watching to see if an injector is leaking. If you find one bad one. Replace all 8!!! Then make sure that cyilnders plug and coil are good. Air things out first though. Don't want any fires and make sure to keep digits and limbs away from the injector spray path...

[Immortan]

GHuggins,

I really do appreciate you taking the time to help out; my dad is also very thankful. I called him this morning and relayed what you and the others have shared. He is going to pull the rails off today and perform the tests and check plugs. TSP didn't even suggest a tuner oddly enough, we are using the guy who tuned my 2017 Chevy SS when I installed my LSA/Custom Grind (607/613 on stock pullies wasn't bad).

We did replace all the lifters with LS7 style ones and trays, checked the lash on install.

Yeah I did find that quite peculiar that there is no in-line filter just the sock in the tank, seems like a recipe for disaster. Hopefully we can find the problem and then get back to tuning, I know its going to need some massaging.

I do just want to say thank you again to all who have pitched in and helped get us steered in the right direction. I know its free advise and it is often thankless, but I do want to say thank you to you all.

[Immortan]

@GHuggins do you know how to make sure all 8 injectors are firing? I did a log today after getting it to run better, 1, 4, 6, 7 are cold like they are not firing at all. Still super confused. Thanks!

[GHuggins]

Those are your DOD cylinders. Did you set the tune up to have DOD disabled? Are the solenoid codes killed in the dtc section?

[Immortan]

So DoD codes are all unchecked and set to Never Report.

I?m honestly so confused as to why it?s still trying to run in DoD. Temp gun confirmed it, I reloaded the tune to make sure I had the DoD one loaded.

I?ll add the DoD commanded into the log and check again this morning to report back.

[GHuggins]

Is DOD killed in the main calibration? Under Fuel - Lean Fuel Saving?

[edcmat-l1]

Looking at the data log it looks like the problem may be on bank 1. I'd pull the valve cover off and check your work. The MAP pressure reacts like it may be getting some reverse pulses from an intake valve not seating.

As Greg said the low rail pressure would indicate an injector problem.

Did you pull the plugs when you did the cam swap? Did any of them look different than the rest?

[edcmat-l1]

Is DOD killed in the main calibration? Under Fuel - Lean Fuel Saving?

Yeah it's turned off in the file he posted.

[GHuggins]

Yes, Kind of pointing back to DOD lifters being reused or something along those lines unless the tune file just isn't getting flashed in for some reason?

[Immortan]

Bird-ReRead.hptWhat-the-bird.hpl

I have attached the re-read of the computer and a log showing more useful information I hope.

I am honestly at a loss with this. I have checked to make sure DoD is disabled, checked to make sure the P34XX codes were off, and it still acts like the DoD is in there.

I know we used new LS7 trays, plugged the intake, and made sure everything was connected; I am still getting issues on 1,4,6,7.

I appreciate all of you who chime in to help me.

[edcmat-l1]

That data log looks worse than the first one.

I suggest you go down to Harbor Freight and buy an infrared temp gun if you do not already have one. They're nearly indispensable for diagnosing different problems. And they're cheap nowadays. You should check the exhaust manifold temps right at the head. That will tell you what cylinders are dead. Will make diagnosing them a little quicker. You'll at least narrow it down within minutes.

Then I'd pull one or both valve covers and check your work. Might was to do a compression test. Pull all the plugs, see what they look like then do a compression test.