Feels like DI isn't kicking in but no CEL

[radroach]

I've had a couple no-starts where my engine wouldn't start on first crank when my engine was hot. I don't think it's much to worry about it besides something being out of range the moment you tried to start it again.

Injection sound is what makes up 90% of engine bay noise. You should just listen to the engine in different settings and states. I test mine every morning, doing different revs taking note of the injector and exhaust-sound feedback. I drive off down the road a couple minutes, pull over and park somewhere where I can hear the engine, listen for injector changeover.

You can also get a long screwdriver or long metal probe and listen to the injectors. I use a flexible claw grabber like pic: Very easy to listen to the injector pulses. You can also listen in on the valvetrain clicking away (it is very quiet and smooth).

[NoHaveMSG]

Originally Posted by 4n0m41y

Log successfully uploaded to datazap: https://datazap.me/u/ziltoid/001?log=0&data=1

Started from a dead stop on an on ramp, accelerated then cruised for about a mile or so, hit stoplight...waited...then did another pull and cruised for maybe 1/4mi

At a quick first glance everything looks pretty normal. I will take a closer look later.

[4n0m41y]

Originally Posted by NoHaveMSG

At a quick first glance everything looks pretty normal. I will take a closer look later.

Greatly appreciated!

[NoHaveMSG]

Originally Posted by 4n0m41y

Greatly appreciated!

Haven't been able to get romraider to load a v4 tune on my laptop. Still looking at.

[NoHaveMSG]

Originally Posted by 4n0m41y

Greatly appreciated!

Honestly, it looks okay. Could be something with the AVCS. The MAF and O2 look like they are reading fine.

@steve99

[4n0m41y]

Originally Posted by NoHaveMSG

Honestly, it looks okay. Could be something with the AVCS. The MAF and O2 look like they are reading fine.

@steve99

Thanks for checking it out! I'm unaware of how the AVCS works on these engines, but I'll do some googling. I see where that would make sense though as what I'm experiencing could probably more accurately have been described as "VTEC ain't kickn in yo". For example, normally when accelerating from a stop you mash it, and it's like...yeah ok I'm moving, then there's a point around 3500/4000ish where you think, hey alright this isn't too bad...I don't get that "this isn't too bad" feeling anymore, just flat until around 5500 and even up that high it doesn't pull like it did at 4000 before whatever happened happened...It's strange.

If it were some bad gas, that probably would have been visible in the logs as quite a bit of knock I'm guessing?

Push comes to shove, I'll reflash the factory tune and take it to the dealer to see if they can find anything...although I'm like 1 of 3 of these cars in my area so the chances of them knowing what the car's suppose to run like compared to what it's running like now are slim at best.

[NoHaveMSG]

Originally Posted by 4n0m41y

If it were some bad gas, that probably would have been visible in the logs as quite a bit of knock I'm guessing?

Yes, but your IAM is going up during the log so it rules that out.

[4n0m41y]

Wait a minute. I just remembered something. Way back when I first got this thing I took it to the dealer I got it from (was a hyundai dealer someone traded this in after putting 6k miles on it for some reason) for an oil change once (cause free oil changes for a year) and they put conventional 5w-30 in it! I made it a couple miles down the road and realized something wasn't right...It was running kind of similar to how it is now, like it felt way down on power. I turned around, took straight back and said...tf? This thing should be running a full synthetic 0w-20. They changed it out, and back to normal.

So with this realization, plus if the avcs system uses oil pressure for engagement (like those solenoids on the bseries engines...just guessing)...now I'm wondering if, hell maybe I just need an oil change? Last change was about 14 months ago...BUT...BUT...hear me out....It's only been driven about 4k miles sense then. Think this full synthetic oil could have broken down to the point that it's ****n off the avcs system? Or am I connecting dots that aren't there >_<.

[humfrz]

Originally Posted by 4n0m41y

Wait a minute. I just remembered something. Way back when I first got this thing I took it to the dealer I got it from (was a hyundai dealer someone traded this in after putting 6k miles on it for some reason) for an oil change once (cause free oil changes for a year) and they put conventional 5w-30 in it! I made it a couple miles down the road and realized something wasn't right...It was running kind of similar to how it is now, like it felt way down on power. I turned around, took straight back and said...tf? This thing should be running a full synthetic 0w-20. They changed it out, and back to normal.

So with this realization, plus if the avcs system uses oil pressure for engagement (like those solenoids on the bseries engines...just guessing)...now I'm wondering if, hell maybe I just need an oil change? Last change was about 14 months ago...BUT...BUT...hear me out....It's only been driven about 4k miles sense then. Think this full synthetic oil could have broken down to the point that it's ****n off the avcs system? Or am I connecting dots that aren't there >_<.

That would be my reckoning (about the dots) -

[steve99]

Originally Posted by 4n0m41y

Uhh oh...what did I do? So this morning on my way to work I was stopped at the top of a hill, but when I went to take off forgot I was still in third...chug...chug...die, slight moment of embarrassment. When I went to fire the engine back up I noticed it took several cranks...like so many more than normal that I'm bringing it up. But it eventually turned over and off I went.

I got about half a mile or so down the road and went to turn onto another street and accelerated in first, and instantly noticed that it felt like half my power was missing. For example instead of feeling the slight pull at around 3500 or so there was nothing until around 5500 and even that felt off. Got to work, parked it, thought...eah maybe it's just in my head.

This evening after work, jumped back in and nope...wasn't in my head. No power up until 5500/6000 and it just doesn't feel "right". No CEL though...which I find strange. Almost feels like it's starved for air, like something's choking it out. I pulled the air box off of it just to check and nothing at the filter level or down in the inlet pipe is obstructing airflow (for as far back as I could fit my hand (the piece that runs into the front bumper cover)).

Started thinking maybe the DI system isn't engaging...but you'd think there'd be a CEL in that case. Has anyone else experienced anything like this? Have any ideas?

Not sure if it's worth mentioning or not, but I have a stage 1 OFT flash on the ecu (that was done like 4 or 5 months ago with no issues).

Bonus question: If I wind up taking this to the dealer should I flash back to the factory tune? I mean it's a 2013 that has no warranty left on anything. If I don't need to, I'd rather not flash it back.

Log data with oft


post logs to www.datazap.me


check di computer eathed with all three bolts


car starts on port


then switches to di and port

[RZNT4R]

Originally Posted by 4n0m41y

Wait a minute. I just remembered something. Way back when I first got this thing I took it to the dealer I got it from (was a hyundai dealer someone traded this in after putting 6k miles on it for some reason) for an oil change once (cause free oil changes for a year) and they put conventional 5w-30 in it! I made it a couple miles down the road and realized something wasn't right...It was running kind of similar to how it is now, like it felt way down on power. I turned around, took straight back and said...tf? This thing should be running a full synthetic 0w-20. They changed it out, and back to normal.

So with this realization, plus if the avcs system uses oil pressure for engagement (like those solenoids on the bseries engines...just guessing)...now I'm wondering if, hell maybe I just need an oil change? Last change was about 14 months ago...BUT...BUT...hear me out....It's only been driven about 4k miles sense then. Think this full synthetic oil could have broken down to the point that it's ****n off the avcs system? Or am I connecting dots that aren't there >_<.

I'm running 5W30 synthetic right now, it's not affecting the AVCS.

[4n0m41y]

Originally Posted by steve99

Log data with oft
post logs to www.datazap.me

log uploaded to: https://datazap.me/u/ziltoid/001?log=0&data=1

[steve99]

Originally Posted by 4n0m41y

log uploaded to: https://datazap.me/u/ziltoid/001?log=0&data=1

if thats a petrol oft tune its running lean at full throttle high 12 should be high 11


fuel trims look ok at idle so bit unusual but check fot inrake and exhaust leaks clean maf sensor and check di comluter bolts all three in and tight

[4n0m41y]

Originally Posted by steve99

if thats a petrol oft tune its running lean at full throttle high 12 should be high 11


fuel trims look ok at idle so bit unusual but check fot inrake and exhaust leaks clean maf sensor and check di comluter bolts all three in and tight

Stage 1 oft tune for 91, and I run 93 through it. Will do the aforementioned and report back. Thanks!