I can't hear the video for some reason but regardless can you explain to me what you are experiencing. Even if I could hear it I would still ask the same question
Take it from the beginning
What do you feel when it does not rev
Do you feel it cut out?
Do you hear anything abnormal?
Etc....


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Looks like you just got gas to
Do you top off the tank when you fill?
Or do you stop when it clicks?
Can it be narrowed down to a timeframe right after you refill?



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Lol you really need to hear it .. the turbo totally cuts out and it stops accelerating. It will actually throw you forward it stops so sudden.. notice the second pull that's when it does it. I never let off the floor soon as it starts. It happens mostly on down shifting. It does it almost all the time now it's getting more frequent. If im doing 60 and down to 4th it will just sit there for a few seconds then climb. I was in 2nd in this video. I checked the obvious things like hoses and such and no dtcs yet.

 

I am wondering if your lpfp is clogged or dirty

 

Lpfp I'll check that out tomorrow but at only 9k miles?

 

As a Tech you will realize mileage means nothing..
And yes the LPFP has show shown sign of some debris and or clogging
If you do some Kgis searching there is an article on this issue
You are removing the LPFP and HPFP and inspecting for debris and coking
on the 5 I have confirmed and fixed there was debris in the tank and on the fuel sock. But the major issue was the HPFP being clogged up on the inlet and outlet.
Read over that and follow the procedure and report back with your findings.
I would like to know what you find



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Actually I'm not thinking it's fuel related anymore.. In the video you can hear the recirculation valve dump right before it happens as if I was letting off the throttle. I'm still checking the fuel today I'll post what I find.

 

Wasn't saying that is your definite problem. . But this is the best that can be done with a video diagnosis.




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And the chances of you finding tank debris is high so ether way it's good to clean it out


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Rulled out low pressure fuel system. Any other idea's? I'm about to open a tech line case. I've checked every hose, low pressure fuel supply, fuel rail pressure, and ran a scan with the kia diagnostic system tablet. I reset adaptives for the heck of it.. still doing it.. the electric waste gate appears to be opening when the problem occurs. And fuel rail pressure is about 2300 during the lag.

 

does it happen only after repeated pulls like that? like if you do a pull then wait a few minutes will it do it the second time always or just after a repeated pull

 

It's pretty random.. I can make it do it every time now when I down shift to second going like 35 and floor it. It totally takes a dump like in that video. If I let off the gas and floor it real quick it will continue to accelerate.. But yeah if I hold it it will just sit there at 3500 and fall slowly. I just saw on the computer that the throttle is closing almost acting like it's peeling out but it's not peeling out at all so weird.

 

funny... i just watched the tuner week video on motortrend for the euro portion, and one of the racers were talking about how their Fiat Abarth was having trouble because they were having problems with the traction control still engaging even though it was turned off... like the computer was actively overriding it

that is the only thing that pops in my mind as an idea or turbo is over boosting and the little solenoid that is is taking a reading at the turbo itself is seeing too much boost and that solenoid is causing the wastegate to open?

did you check the hoses and the electrical connector at the waste gate solenoid?

 

Take it out for a drive and datalog the major pids with selective display so you get a good refresh rate
Should be able to pin point what's causing this with that
Quite possible it's overboosting but who knows until you get some good data to review
If you like you can send me the file and I can look it over in the morning when I get to work



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Off subject sorry but @precrack what mods you got on your car?

 

I have the sri from 6th, resonator delete, Bluetooth obd2 to torq, rcv valve is vta, those are the only engine relevant ones I can think of.

 

Your car sounds good in the vid

 

Hey thanks man!

Just a update, Confirmed it's overboosting and going into limp mode til it evens out. Still working on the cause. Thanks everyone for the suggestions!

 

Time to get "torked" I guess? The over boost with no limp mode....
Bit off topic but that same thing has happened to a family members ford fusion ecoboost. Not sure of cause or fix but he goes to accelerate and it just falls flat then he let off and stomped on it nothing. Did it again and car took off and almost rear ended someone.... ford couldn't find a problem with it....

 

Before any "torking" is done, The issue would need to be fixed before a tune would be introduced.


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If it's overboosting you have to start with the basics and think how the system works
Did you datalog with the scantool?
Watch the wastegate actuator and see what it does when you over boost. Start knocking things off your list of what could cause this one by one


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I wonder if your wastegate is sticking or something ?

sucks that its virtually impossible to remove the wastegate actuator without really getting into removing the turbo

 

Found something interesting.. My friend suggested putting the stock intake and filter back on and try it out. So I did and guess what, no more limp mode! I reverted back to the cone filter on stock tubing and the problem happened right away. So the car is not liking the high flow filters... Or maybe it does? Maybe it likes them too much lol.. I'm going to install the 6th element sri and try deleting adaptive values right away one more time and cross my fingers!

 

What intake and filter were you using
That just seems really strange
Plus giving the fact we are running map sensors really puts a twist on your theory. Either way it is what it is

 

The stock airbox and filter maybe slows the spool down enough to not over boost? Lol I have no idea but I'm pretty confused on this whole issue.

 

Have you taken my advice and logged as you do this?
You have to take note of what you are reading so u have a point of reference.
When you have the intake setup in that you are saying is causing issues
-map sensor reading
-wastegate percentage
-throttle
-afr
-timing

When you change it to the setup that you are saying makes it better. Compare the readings

You will find that doing this will narrow your results and help your diagnosis
Changing parts back and forth is fine and dandy, but what if you are just masking the issue

Overboosting can be cause by various things
Excessive exhaust flow (but your are stock so that's unlikely since your fuel maps etc. are stock)
Internal failure
Faulty map sensor
Faulty wastegate actuator
Faulty wastegate solenoid
The list can be carried on and on.

You need to be careful here because overboosting can really do some damage in the long run.
Post what you find and I will keep helping the best I can

 

Yeah I'm working on it at home right now I don't have a lot of diagnostic capabilities today. I guess I can get some basic stuff with torque. But won't be able to see the wastegate and such.

 

I'm guessing since you were at a meet and racing your all fixed up now
Can you please update your findings
I would also like to know for personal future reference
Thanks

 

Guys I need some help quickly..Can someone try to make this problem happen to their car? I thought I fixed it but I didn't. 2nd gear at 30mph and floor it a few times and see if it cuts power. I have an open tech line case and they said it may be normal operation. If you could get fuel pressure for me too that would be awesome!

 

How many is a few? Maybe it is acting normal

 

As you saw on the video it was on the second pull.. maybe 5 or 6 pulls should be enough to determine. Mine is happening often, if it's normal operation im trading it in. Lol..