P0171 and P117B after Edelbrock SC FIXED

[snowtaipan]

Originally Posted by BirdTRD

Doh! Time to spill a little fuel then I guess.
As far as the intake gaskets and mating surfaces, I think that junk you see is just dirt and grime from all the stuff you sprayed around leak hunting.
Did you say you checked your MAF o-ring and it was good?

Makes sense about the grime.
Yeah, over if the smoke tests I did was partially looking for the MAF to leak. It's snug as a bug.

The veins in the MAF don't look lines up perfectly, could that few degrees maybe cause issues? Grabbing at straws here

[snowtaipan]

Originally Posted by Irace86.2.0

Just have a rag over the bolt. Undo it slowly like a shaken can of soda. It isn’t bad.

Well, time to donate another t shit to the car lol

[snowtaipan]

Originally Posted by Irace86.2.0

Might as well check the direct injectors n seals.

IDK, those didn't get pulled during install so there shouldn't be any issues, but opening it up could create some.

[BirdTRD]

If it were me...I'd put it back to stock and test the shit out of it and verify all sensors and readings are where they should be and there are no issues that snuck in.
If you rule out hardware and installer-err, the only thing left if software.

[Irace86.2.0]

Originally Posted by snowtaipan

IDK, those didn't get pulled during install so there shouldn't be any issues, but opening it up could create some.

Except the P117B and the addition of considerable more cylinder pressure and heat.

https://www.cardiag.me/obd2-en/p117b-toyota/

https://www.google.com/amp/s/amp.red...ector_failure/

[tomm.brz]

Do not pull direct injectors out unless you have 4 spare orings and the needed tool to install them

also blown DI orings make a distinctive sound (when you suddenly blip it makes a sound in your engine bay like if you are trying to unblock a sink with a plunger

Make sure MAF is clean

I do not see anything wrong with the High pressure fuel pump
if you had problems with the high pressure fuel pump, it wouldnt even crank, car uses PI during crank but for a briefly moment, it blasts shortly with the DI to keep it running before switching again to PI

i still think is a bad tune, i m helping snowtaipan with this let s see what the next logs will show

[Irace86.2.0]

Originally Posted by tomm.brz

Do not pull direct injectors out unless you have 4 spare orings and the needed tool to install them

also blown DI orings make a distinctive sound (when you suddenly blip it makes a sound in your engine bay like if you are trying to unblock a sink with a plunger

Make sure MAF is clean

I do not see anything wrong with the High pressure fuel pump
if you had problems with the high pressure fuel pump, it wouldnt even crank, car uses PI during crank but for a briefly moment, it blasts shortly with the DI to keep it running before switching again to PI

i still think is a bad tune, i m helping snowtaipan with this let s see what the next logs will show

What’s the direct injector code about? Could the injector fail on its own? I heard that injector seals can fail then the injector can fail from overheating or something.

[Ultramaroon]

Originally Posted by Irace86.2.0

What’s the direct injector code about? Could the injector fail on its own? I heard that injector seals can fail then the injector can fail from overheating or something.

Blown DI seals make an unholy racket. They are quite obvious.

[tomm.brz]

Originally Posted by Irace86.2.0

What’s the direct injector code about? Could the injector fail on its own? I heard that injector seals can fail then the injector can fail from overheating or something.

it s not like the injectors have sensors. that senses if the oring snap or something like that .. that code is probably causes by the high ltft at low loads

[Irace86.2.0]

Originally Posted by tomm.brz

it s not like the injectors have sensors. that senses if the oring snap or something like that .. that code is probably causes by the high ltft at low loads

But it only effects the direct injectors because the ports aren’t on/dominant?

[tomm.brz]

that I don t know, it could be.
there are conditions that must be met to trigger those CEL and i dont know them

CEL/DTC are infamous, specially if they trigger indirectly like in this case

[Irace86.2.0]

Originally Posted by Ultramaroon

Blown DI seals make an unholy racket. They are quite obvious.

I was advised by Zach when he was at DT that my DI seals could be going out based on my logs, so I replaced them. No codes though. No racket, yet no missing or torn seals either, so that may be expected. They just had the usual buildup of carbon, and there was carbon buildup on the tips that I cleaned off. Pics in my build.

Just figured there could be grades of failure from poor sealing to missing seals.

[Irace86.2.0]

Originally Posted by tomm.brz

that I don t know, it could be.
there are conditions that must be met to trigger those CEL and i dont know them

CEL/DTC are infamous, specially if they trigger indirectly like in this case

That’s the thing. An intermittent code either immediately goes away if the problem is corrected, or it goes away after a drive cycle. A serious CEL usually comes on with the red warning lamp. A cleared code that doesn’t return when the car starts is a soft code, but it will return if the issue arises again or if the engine goes through the full drive cycle, but didn’t meet the standards.

His issue sounds like a soft code. I don’t know if the problem returns when he just idles it for a while or only if he gets on power or rarer, but if it doesn’t return immediately when the car starts then he should be able to capture the moment the CEL comes on when doing a log then you could assess what the conditions were exactly like at that moment.

[tomm.brz]

i guess he gets it just sometimes randomly during drive but would need more info from OP about it