Reduced Engine Power - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

j.curt · 09-15-2016, 09:48 PM

I know this is a hard question to answer without seeing a data log but is there a possibility this could be a mechanical issue and not a tuning issue? All the feedback I have received says it not likely a mechanical issue. The research I have done shows a couple people were getting this because of the throttle body. The tuner I used is 2 hours away so I am not able to make it out there for them to take a look at it.

I brought my car to the track last month and last night. Car seems to run fine until I bring it down the track. 1st pass last night it went into reduced engine power mode switching from 3rd to 4th at 116MPH. I thought maybe the car didn't like the 6,000RPM I was switching at so the next pass I went real easy and switched from 2nd to 4th and same thing happened at 116MPH. Temperature outside ranged from 85-70 degrees so it wasn't really hot outside.

Let the car cool down for a good hour and a half and gave it another try and this time switching from 2nd to 3rd it went into reduced engine power mode.

The codes coming up are P2138 (Throttle/Pedal Position Sensor/Switch "D"/"E" Voltage Correlation. C0242(No DTC definition found) and P0443(Evaporative Emission System Purge Control Valve Circuit)

I don't have anything to data log the car.

Car mods include AGP TT Kit, BTR N/A Stage II Cam, Vmax ported TB.

Has anyone ever ran into this issue or have a guess what's causing the issue? Is there something I can buy to datalog that is cheap?

ttshovel · 09-15-2016, 09:54 PM

Quote:

Originally Posted by j.curt

I know this is a hard question to answer without seeing a data log but is there a possibility this could be a mechanical issue and not a tuning issue? All the feedback I have received says it not likely a mechanical issue. The research I have done shows a couple people were getting this because of the throttle body. The tuner I used is 2 hours away so I am not able to make it out there for them to take a look at it.

I brought my car to the track last month and last night. Car seems to run fine until I bring it down the track. 1st pass last night it went into reduced engine power mode switching from 3rd to 4th at 116MPH. I thought maybe the car didn't like the 6,000RPM I was switching at so the next pass I went real easy and switched from 2nd to 4th and same thing happened at 116MPH. Temperature outside ranged from 85-70 degrees so it wasn't really hot outside.

Let the car cool down for a good hour and a half and gave it another try and this time switching from 2nd to 3rd it went into reduced engine power mode.

The codes coming up are P2138 (Throttle/Pedal Position Sensor/Switch "D"/"E" Voltage Correlation. C0242(No DTC definition found) and P0443(Evaporative Emission System Purge Control Valve Circuit)

I don't have anything to data log the car.

Car mods include AGP TT Kit, BTR N/A Stage II Cam, Vmax ported TB.

Has anyone ever ran into this issue or have a guess what's causing the issue? Is there something I can buy to datalog that is cheap?

sounds like you might have some burnt or pinched wiring.

j.curt · 09-15-2016, 10:00 PM

Is there specific wires I should check first or just start inspecting wires near everything that gets hot?

RealQuick · 09-15-2016, 10:33 PM

Quote:

Originally Posted by j.curt

Is there specific wires I should check first or just start inspecting wires near everything that gets hot?

If your tuner modified the throttle position table, have him put it back to stock. I modified that table on the dyno and I believe it was the primary cause of me going into reduced power mode on the dyno.

AGP Turbo · 09-15-2016, 11:18 PM

Tune 99% likely

Glushenij · 09-15-2016, 11:57 PM

My did 3 times ( AGP kit) in 2 weeks all same down shift to try pass car but my code was Ecm fail( I think code po606 or something) I was thinking get new ecu but it's just quit doing that- not single time in past 2 months! So maybe u get lucky like me and it will stops

j.curt · 09-16-2016, 12:25 AM

Quote:

Originally Posted by Glushenij

My did 3 times ( AGP kit) in 2 weeks all same down shift to try pass car but my code was Ecm fail( I think code po606 or something) I was thinking get new ecu but it's just quit doing that- not single time in past 2 months! So maybe u get lucky like me and it will stops

That is weird. I don't think I am going to be as lucky as you being it has been happening for over a month. Glad to hear yours fixed itself though.

AGP Turbo · 09-16-2016, 02:23 AM

REP mode is usually a maximum airflow per throttle position setting in the ecu. Increase the whole table by 50% to get away from it.

ants-gts · 09-16-2016, 06:28 AM

sounds like the throttle blade is closing under boost common issue some servo motors
are not strong enough to hold the blade open

Elite Engineering · 09-16-2016, 10:30 AM

Check your MAF for any oil getting on the MAF wires....the combination of maxing air flow out and any contaminates on the wires will trigger reduced power mode. What are you doing for proper crankcase evacuation and air/oil separation? Can you post pictures of how your PCV hoses are run?

j.curt · 09-16-2016, 04:20 PM

Catch can is from Mighty Mouse

RealQuick · 09-16-2016, 04:45 PM

I'll take a look at your tune again tonight.

j.curt · 09-16-2016, 04:47 PM

Different tune in the car now. The tune I sent you was from the very first person I went to. That tune is no good.

jose1003 · 09-16-2016, 05:31 PM

had an lsa conversion, and normal driving car worked good, but after stepping on peddle and reaching high speeds car went into reduced engine mode. cant remember the codes, double checked wires and it was a no go.
at the end it was the tune
andy from adm really helped in fixing the issue

hope you get your car running,

09-15-2016, 09:48 PM	#1
j.curt Drives: 2017 Camaro 1SS Join Date: Jun 2014 Location: California Posts: 952 View My Garage	Reduced Engine Power I know this is a hard question to answer without seeing a data log but is there a possibility this could be a mechanical issue and not a tuning issue? All the feedback I have received says it not likely a mechanical issue. The research I have done shows a couple people were getting this because of the throttle body. The tuner I used is 2 hours away so I am not able to make it out there for them to take a look at it. I brought my car to the track last month and last night. Car seems to run fine until I bring it down the track. 1st pass last night it went into reduced engine power mode switching from 3rd to 4th at 116MPH. I thought maybe the car didn't like the 6,000RPM I was switching at so the next pass I went real easy and switched from 2nd to 4th and same thing happened at 116MPH. Temperature outside ranged from 85-70 degrees so it wasn't really hot outside. Let the car cool down for a good hour and a half and gave it another try and this time switching from 2nd to 3rd it went into reduced engine power mode. The codes coming up are P2138 (Throttle/Pedal Position Sensor/Switch "D"/"E" Voltage Correlation. C0242(No DTC definition found) and P0443(Evaporative Emission System Purge Control Valve Circuit) I don't have anything to data log the car. Car mods include AGP TT Kit, BTR N/A Stage II Cam, Vmax ported TB. Has anyone ever ran into this issue or have a guess what's causing the issue? Is there something I can buy to datalog that is cheap?

09-15-2016, 11:57 PM	#6
Glushenij Drives: 2014 Camaro 2SS 1LE Join Date: Jul 2015 Location: Lima Ohio Posts: 167	My did 3 times ( AGP kit) in 2 weeks all same down shift to try pass car but my code was Ecm fail( I think code po606 or something) I was thinking get new ecu but it's just quit doing that- not single time in past 2 months! So maybe u get lucky like me and it will stops __________________ AGP TT 807whp 811wtq 13.46psi E85+methanol

09-16-2016, 04:20 PM	#11
j.curt Drives: 2017 Camaro 1SS Join Date: Jun 2014 Location: California Posts: 952 View My Garage	Catch can is from Mighty Mouse Attached Images

09-16-2016, 05:31 PM	#14
jose1003 Drives: 2010 Camaro 2SS Cyber Gray Join Date: Jul 2009 Location: El Paso, Texas Posts: 1,132	had an lsa conversion, and normal driving car worked good, but after stepping on peddle and reaching high speeds car went into reduced engine mode. cant remember the codes, double checked wires and it was a no go. at the end it was the tune andy from adm really helped in fixing the issue hope you get your car running, __________________

09-15-2016, 10:00 PM	#3
j.curt Drives: 2017 Camaro 1SS Join Date: Jun 2014 Location: California Posts: 952 View My Garage	Is there specific wires I should check first or just start inspecting wires near everything that gets hot?

09-15-2016, 11:18 PM	#5
AGP Turbo Drives: All things Turbocharged Join Date: Dec 2010 Location: AZ Posts: 1,199	Tune 99% likely

09-16-2016, 02:23 AM	#8
AGP Turbo Drives: All things Turbocharged Join Date: Dec 2010 Location: AZ Posts: 1,199	REP mode is usually a maximum airflow per throttle position setting in the ecu. Increase the whole table by 50% to get away from it.

09-16-2016, 06:28 AM	#9
ants-gts Drives: gen f gts Join Date: Jan 2016 Location: australia Posts: 2	sounds like the throttle blade is closing under boost common issue some servo motors are not strong enough to hold the blade open

09-16-2016, 10:30 AM	#10
Elite Engineering Drives: 2010 Camaro Join Date: Nov 2009 Location: Denver Posts: 1,382	Check your MAF for any oil getting on the MAF wires....the combination of maxing air flow out and any contaminates on the wires will trigger reduced power mode. What are you doing for proper crankcase evacuation and air/oil separation? Can you post pictures of how your PCV hoses are run?

09-16-2016, 04:45 PM	#12
RealQuick Drives: 2010 Camaro 2SS M6 - Intake/Exhaust Join Date: Sep 2014 Location: Bridgewater Posts: 693	I'll take a look at your tune again tonight.

09-16-2016, 04:47 PM	#13
j.curt Drives: 2017 Camaro 1SS Join Date: Jun 2014 Location: California Posts: 952 View My Garage	Different tune in the car now. The tune I sent you was from the very first person I went to. That tune is no good.