Engine Cut out at high RPM
03-12-2013 | 01:05 PM
#1
Thread Starter
JK Newbie
Joined: Dec 2012
Posts: 59
Likes: 0
From: Abilene, TX
Engine Cut out at high RPM
Has this happened to anyone else? Any ideas as to what's up or a solution?
Driving the other day, here's what happened:
Driving 45 or 50 mph, floored it
Engine revs high
Then cuts out completely for a fraction of a second
Then roars back for a fraction of a second
Then cuts out completely for a fraction of a second
Then roars back for a fraction of a second
Then cuts out completely for a fraction of a second
I remove foot from the accelerator.
In another fraction of a second engine comes back to life, and I ease onto the accelerator and life is good.
A couple hundred miles later I'm showing the P0456 Evaporative Emission System Leak Detected (very small). Code cleared using Diablo Predator. Note I have the gascap code, and have forever.
07 Unlimited, 3.8, Ripp Supercharged, Intercooled, Ripp headers.
Thanks to everyone!
Driving the other day, here's what happened:
Driving 45 or 50 mph, floored it
Engine revs high
Then cuts out completely for a fraction of a second
Then roars back for a fraction of a second
Then cuts out completely for a fraction of a second
Then roars back for a fraction of a second
Then cuts out completely for a fraction of a second
I remove foot from the accelerator.
In another fraction of a second engine comes back to life, and I ease onto the accelerator and life is good.
A couple hundred miles later I'm showing the P0456 Evaporative Emission System Leak Detected (very small). Code cleared using Diablo Predator. Note I have the gascap code, and have forever.
07 Unlimited, 3.8, Ripp Supercharged, Intercooled, Ripp headers.
Thanks to everyone!
03-12-2013 | 01:44 PM
#3
Sponsoring Manufacturer
Joined: Jul 2007
Posts: 1,189
Likes: 2
From: New York
This is a quote from our tuner/calibrators last email on 3/7 regarding your specific vehicle.
"If the gas cap code keeps popping up - its not in the tune - its a hard part failure or vacuum leak. There is nothing in the tune that modifies the Gas Cap Code. The calibrations we provide correct the ECU for the added air and fuel the compressor brings and does not over ride the safety systems in any way.
When you re-write the ECU you do erase the standing codes until it goes through its drive cycle. You must be pressurizing the system some where we would again suggest going over the EGR and PCV system to confirm the pressure is not leaking.
RIPP Tuning & Calibrations
718-815-1313 x17
RIPP Superchargers"
03-12-2013 | 03:04 PM
#4
JK Enthusiast
Joined: Dec 2012
Posts: 194
Likes: 0
From: Abilene
Almost sounds like a TPS. Throttle position sensor. The TPS should throw a code I believe. I don't have the equipment or the know how to check this though. Also may be the mass airflow sensor. Which controls the air fuel mixture.
03-12-2013 | 03:14 PM
#6
JK Freak
Joined: Sep 2012
Posts: 847
Likes: 1
From: Dunnellon, FL
You need to repair the issue with the EGR/PCV system. There is a leak, or a backwards vacuum line somewhere in your vehicle. Before we can procede any further, you need to address the mechanical problems that are present with your vehicle.
This is a quote from our tuner/calibrators last email on 3/7 regarding your specific vehicle.
"If the gas cap code keeps popping up - its not in the tune - its a hard part failure or vacuum leak. There is nothing in the tune that modifies the Gas Cap Code. The calibrations we provide correct the ECU for the added air and fuel the compressor brings and does not over ride the safety systems in any way.
When you re-write the ECU you do erase the standing codes until it goes through its drive cycle. You must be pressurizing the system some where we would again suggest going over the EGR and PCV system to confirm the pressure is not leaking.
RIPP Tuning & Calibrations
718-815-1313 x17
RIPP Superchargers"
This is a quote from our tuner/calibrators last email on 3/7 regarding your specific vehicle.
"If the gas cap code keeps popping up - its not in the tune - its a hard part failure or vacuum leak. There is nothing in the tune that modifies the Gas Cap Code. The calibrations we provide correct the ECU for the added air and fuel the compressor brings and does not over ride the safety systems in any way.
When you re-write the ECU you do erase the standing codes until it goes through its drive cycle. You must be pressurizing the system some where we would again suggest going over the EGR and PCV system to confirm the pressure is not leaking.
RIPP Tuning & Calibrations
718-815-1313 x17
RIPP Superchargers"
Examples of Settings/Changes to the JK:
Download Features: features only available by downloading.
· Speed Limiter: Adjust from 45mph to 200mph.
· Rev Limiter in Drive: Adjust from 5000 rpm to 6500 rpm.
· Rev Limiter in Neutral: Adjust from 5000 rpm to 5700 rpm.
· Transmission shift point: Modify shift points at Wide Open Throttle on an automatic.
· Calibrate Speedometer: Adjust from a tire size of 23.2" up to 45.5".
Last edited by AtlJeepsTer; 03-12-2013 at 03:30 PM.
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03-12-2013 | 10:00 PM
#9
JK Freak
Joined: Sep 2012
Posts: 847
Likes: 1
From: Dunnellon, FL
Has this happened to anyone else? Any ideas as to what's up or a solution?
Driving the other day, here's what happened:
Driving 45 or 50 mph, floored it
Engine revs high
Then cuts out completely for a fraction of a second
Then roars back for a fraction of a second
Then cuts out completely for a fraction of a second
Then roars back for a fraction of a second
Then cuts out completely for a fraction of a second
I remove foot from the accelerator.
In another fraction of a second engine comes back to life, and I ease onto the accelerator and life is good.
A couple hundred miles later I'm showing the P0456 Evaporative Emission System Leak Detected (very small). Code cleared using Diablo Predator. Note I have the gascap code, and have forever.
07 Unlimited, 3.8, Ripp Supercharged, Intercooled, Ripp headers.
Thanks to everyone!
Driving the other day, here's what happened:
Driving 45 or 50 mph, floored it
Engine revs high
Then cuts out completely for a fraction of a second
Then roars back for a fraction of a second
Then cuts out completely for a fraction of a second
Then roars back for a fraction of a second
Then cuts out completely for a fraction of a second
I remove foot from the accelerator.
In another fraction of a second engine comes back to life, and I ease onto the accelerator and life is good.
A couple hundred miles later I'm showing the P0456 Evaporative Emission System Leak Detected (very small). Code cleared using Diablo Predator. Note I have the gascap code, and have forever.
07 Unlimited, 3.8, Ripp Supercharged, Intercooled, Ripp headers.
Thanks to everyone!
[h=2]P0456 Code, Small Evap Leak FIXED[/h]
So for the past few months I've been battling the dang check engine light coming on even after a reset. Got the 0456 code and found out that it was the emission/ evap system "small leak." Most folks, including my mechanic suggested starting at the gas cap.
Big surprise, it came back on after a few hundred miles. I checked all of the evap/vacuum lines (or so I thought) and couldn't find the source. I read somewhere that the battery sometimes corrodes a vacuum line which is right next to it. I checked it and sure as hell, small hole from the battery acid or heat. I did a quick cheap and temporary fix in order to diagnose if that was the source of the code popping. I taped the line up with some electrical tape, and 500 miles later, still no codes popping! Thought I'd share this for anyone else who may be dealing with this frustrating code popping and likes to DIY. I'll be replacing the line soon, and figuring out a way to reroute it or shield it from the battery acid.
Once you see where this darn thing is you'll wonder what they were thinking putting it there in the first place. Anyhow, hope this helps someone.
Stay dirty my friends.
https://www.jk-forum.com/forums/stoc...-fixed-237480/
Big surprise, it came back on after a few hundred miles. I checked all of the evap/vacuum lines (or so I thought) and couldn't find the source. I read somewhere that the battery sometimes corrodes a vacuum line which is right next to it. I checked it and sure as hell, small hole from the battery acid or heat. I did a quick cheap and temporary fix in order to diagnose if that was the source of the code popping. I taped the line up with some electrical tape, and 500 miles later, still no codes popping! Thought I'd share this for anyone else who may be dealing with this frustrating code popping and likes to DIY. I'll be replacing the line soon, and figuring out a way to reroute it or shield it from the battery acid.
Once you see where this darn thing is you'll wonder what they were thinking putting it there in the first place. Anyhow, hope this helps someone.
Stay dirty my friends.
https://www.jk-forum.com/forums/stoc...-fixed-237480/
03-13-2013 | 01:11 PM
#10
Thread Starter
JK Newbie
Joined: Dec 2012
Posts: 59
Likes: 0
From: Abilene, TX
Thanks everyone, looks like a trip to the mechanic. I cannot find the leak, but nor do I have much experience looking for such things. I'll post back up with a SC update when we get that back on track.