Unknown Power Stall/Cut out

Jordon Wade

Jordon Wade

Greenie N00B Member
Greenie Member
The car feels like it will start to cut out or well hesitate when I give it full throttle. My fuel pressure is great, and my boost consistently hits its target of 22lbs. It will start to hesitate at full throttle sometimes, my best description would be I floor the car and it just starts popping instead of a clean pull for about a couple seconds, then it will lay down the power and go full out. I’m just confused on why it doesn’t pull all the way through
 
Jordon Wade said:
The car feels like it will start to cut out or well hesitate when I give it full throttle. My fuel pressure is great, and my boost consistently hits its target of 22lbs. It will start to hesitate at full throttle sometimes, my best description would be I floor the car and it just starts popping instead of a clean pull for about a couple seconds, then it will lay down the power and go full out. I’m just confused on why it doesn’t pull all the way through
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check spark plugs
 
It’s also making 3-6 on the knock retard sensor

StayFrausty said:
check spark plugs
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I just replaced the spark plugs

Jordon Wade said:
The car feels like it will start to cut out or well hesitate when I give it full throttle. My fuel pressure is great, and my boost consistently hits its target of 22lbs. It will start to hesitate at full throttle sometimes, my best description would be I floor the car and it just starts popping instead of a clean pull for about a couple seconds, then it will lay down the power and go full out. I’m just confused on why it doesn’t pull all the way through
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The car idles fine, normal driving is fine, and the only code i have is for an O2 sensor because of my straight pipe


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="Jordon Wade, post: 94794, member: 5687"]I just replaced the spark plugs
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What did you gap them to? What tune are you using? Why do you have a straight pipe but not having the codes for the rear O2 sensor turned off? Are you on the factory MAP sensor? If so 22 psi is the max it will read and it will either hit fuel cut/hit a brick once you try to pass its limits of what it can read. What turbo are you using etc?[/QUOTE]
 
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L337TurboZ said:
What did you gap them to? What tune are you using? Why do you have a straight pipe but not having the codes for the rear O2 sensor turned off? Are you on the factory MAP sensor? If so 22 psi is the max it will read and it will either hit fuel cut/hit a brick once you try to pass its limits of what it can read. What turbo are you using etc?
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[/QUOTE]

I have very low knowledge on how to do a lot of things on my car as sad as that sounds, if you could explain how to turn that sensor off I’d appreciate it, as far as the plugs I don’t know what they’re gapped too or how to measure it and they’re iridium, the guy at O Reilly’s picked then out for me. Im tuned by Will at PD tuning and it’s actually targeted to hit 21 but I’ve been hitting 22. And yeah I’m on the factory MAP sensor and stock turbo


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L337TurboZ said:
What did you gap them to? What tune are you using? Why do you have a straight pipe but not having the codes for the rear O2 sensor turned off? Are you on the factory MAP sensor? If so 22 psi is the max it will read and it will either hit fuel cut/hit a brick once you try to pass its limits of what it can read. What turbo are you using etc?
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[/QUOTE]

My whole mod list:
Cobb AP
Auto tech hpfp
Cobb Sri, inlet hose
eBay down pipe
Muffler and resonator deletes
AEM intake fuel pump 340 lph


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You're going to want to take the spark plugs out, but not before you go back to O'Reilys and get yourself some sort of spark plug measuring device (Spark Plug Gap Tool). They come in a few different forms, maybe do a quick little google search so you have an idea of what you are hunting for when you go in. I can't quiet recall exactly what you want the plugs gapped too when running a DP, someone can step in and correct me if I'm wrong, but from what I can remember, it'll be something like 0.026-0.028.

Judging from what has already been said in this thread and some prior knowledge about Ebay Downpipes, you might be getting boost creep because of lack of back pressure. Combined with an OEM MAP sensor, which maxes out at 22 psi (as stated by L337Turboz), you could be hitting some kind of boost cut. From my understanding, boost creep is from lack of back pressure, which is usually supplied by the OEM cats. Removing both of these cats, let's things flow a little better resulting in higher boost numbers than intended.

In terms of turning off the CEL for the second O2 Sensor, someone correct me if I'm wrong, but that would have to be done by who ever you are tuned by. In this case Will from PD tuning.
 
Anaphra said:
You're going to want to take the spark plugs out, but not before you go back to O'Reilys and get yourself some sort of spark plug measuring device (Spark Plug Gap Tool). They come in a few different forms, maybe do a quick little google search so you have an idea of what you are hunting for when you go in. I can't quiet recall exactly what you want the plugs gapped too when running a DP, someone can step in and correct me if I'm wrong, but from what I can remember, it'll be something like 0.026-0.028.

Judging from what has already been said in this thread and some prior knowledge about Ebay Downpipes, you might be getting boost creep because of lack of back pressure. Combined with an OEM MAP sensor, which maxes out at 22 psi (as stated by L337Turboz), you could be hitting some kind of boost cut. From my understanding, boost creep is from lack of back pressure, which is usually supplied by the OEM cats. Removing both of these cats, let's things flow a little better resulting in higher boost numbers than intended.

In terms of turning off the CEL for the second O2 Sensor, someone correct me if I'm wrong, but that would have to be done by who ever you are tuned by. In this case Will from PD tuning.
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Extremely helpful thank you [emoji1316]


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What Anaphra said is right. When there is less back pressure the turbo can spool faster resulting in higher boost levels.

If your tune is locked by your tuner then they will have to turn codes off for you. Otherwise you'll need to pay Cobb to take their online course so you can download access tuner and do it yourself.

If you are on a stock K04 you aren't making much power higher than 20 psi. It probably hits 22 then tapers down to 16-17 at redline cause it just can't flow that great at higher rpms. So that midrange spike in pressure is probably triggering your cut. I dealt with this when I first got my Speed. The stock turbo basically blows hot air at pressures that high especially with a stock TMIC
 
L337TurboZ said:
What Anaphra said is right. When there is less back pressure the turbo can spool faster resulting in higher boost levels.

If your tune is locked by your tuner then they will have to turn codes off for you. Otherwise you'll need to pay Cobb to take their online course so you can download access tuner and do it yourself.

If you are on a stock K04 you aren't making much power higher than 20 psi. It probably hits 22 then tapers down to 16-17 at redline cause it just can't flow that great at higher rpms. So that midrange spike in pressure is probably triggering your cut. I dealt with this when I first got my Speed. The stock turbo basically blows hot air at pressures that high especially with a stock TMIC
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So if I get a new MAP sensor from cork sport, will it help fix the issue, I’ve only seen it drop down 19, at redline not any lower than that tho, I’ll go ahead and re gap the plugs so check that as well


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Getting a new map sensor will help reduce the likelihood if it over boosts but you'll need to have the tune adjusted for it immediately after install. The scale is different compared to the stock one and it won't read right unless the sensor calibration table in your tune is changed to match the new one.
 
You might also want to do a little more research about spark plug gap, or someone can chime in about that.
 
L337TurboZ said:
Getting a new map sensor will help reduce the likelihood if it over boosts but you'll need to have the tune adjusted for it immediately after install. The scale is different compared to the stock one and it won't read right unless the sensor calibration table in your tune is changed to match the new one.
Click to expand...

Got new ngks and gapped them to 0.027, the cut out is completely gone y’all are the real mvps


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