Intermittent fuel issue

[Bihv]

Hey guys new here. I have searched and searched to try and find an answer for the issue that I am having. I have talked to multiple shops and my tuner has even reached out to ECUTEK themselves to try and diagnose this problem. At random times I will have no throttle response. I have the gas pedal to the floor and it only chugs along until it comes to a complete stop then dies. I am turbocharged and am running an ECUTEK tune from Bill at Drift Office in Auburn. I have been able to get multiple logs from the ECUTEK program but there has been nothing found in the logs from anyone that I have talked to that would be able to diagnose the problem. Its not like it happens all of the time. The car can run fine for months at a time then the problem starts happening and it won't go away. When fully on throttle when it is happening the car is reading that I am 4.3% throttle. I'm starting to suspect the fuel pump. I have brand new injectors in the car (ECUTEK 750cc). I am curious if someone has had the same issue and I just overlooked the thread. Any help would be very appreciated.

[Spairo]

If the logs show that you are at 4.3% throttle when your foot is flat on the floor, wouldn't that indicate a bad throttle pedal assembly or a bad throttle position sensor in the intake?

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[Bihv]

Originally Posted by Spairo

If the logs show that you are at 4.3% throttle when your foot is flat on the floor, wouldn't that indicate a bad throttle pedal assembly or a bad throttle position sensor in the intake?

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My tuner swapped out my pedal assembly and it still shows the same thing. The only time it shows my throttle is at 4.3% is when I am having the issue. When the car is running fine the throttle will show what it should, when it's flat on the floor it shows 100%. They have had the car for about 2 weeks now. I am not sure if they have checked the throttle position sensor or not.

[christian_sizemore]

I am having an almost identical issue. I have a custom turbo installed along with an ECUTek tune as well. It is a dedicated track car. On Friday 6/10/22 this was a huge problem on the track. It would happen then go away and then twice it died and would not restart. Later in the paddock after a few minutes it would start and seem just fine. Mine is going to the shop next week to see what they can find with it.

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[Olson1288]

Originally Posted by christian_sizemore

I am having an almost identical issue. I have a custom turbo installed along with an ECUTek tune as well. It is a dedicated track car. On Friday 6/10/22 this was a huge problem on the track. It would happen then go away and then twice it died and would not restart. Later in the paddock after a few minutes it would start and seem just fine. Mine is going to the shop next week to see what they can find with it.

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This is a long shot, but did either of you end up figuring out the issue? I have a turbo BRZ, and it's been having something similar as described here:


https://www.ft86club.com/forums/showthread.php?t=151172


Stumbling/surging, and occasionally the throttle/pedal completely stops responding to any input.