Reduced engine power problem
Thread Starter
Instructor
Joined: May 2013
Posts: 110
Likes: 13
From: Dixon Il
Reduced engine power problem
I have a 2002 Z06 with an LSX 427, I have installed a Procharger F1X. Since the installation I constantly get a reduced engine power light and the engine goes to 2000 rpm and the throttle has no affect until I reset the computer. I understand the purpose of the reduced engine power light and this system. What I do not understand is why I keep getting this light?
The car goes to REP anytime I try to drive attempt to tromp on the throttle and the rear wheels spin, it immediately goes to REP and I have to go thru the reset on the computer. I have a Nick Williams throttle body on it now that is supposed to be made for supercharged motors. I have tried numerous throttle bodies and still get the same results. I have the car at the shop that built the motor but they have not been able to figure this problem out?
I have invested tons of money in this car and not able to enjoy all of this power due to this issue
Does anyone have any ideas on what to do?
The car goes to REP anytime I try to drive attempt to tromp on the throttle and the rear wheels spin, it immediately goes to REP and I have to go thru the reset on the computer. I have a Nick Williams throttle body on it now that is supposed to be made for supercharged motors. I have tried numerous throttle bodies and still get the same results. I have the car at the shop that built the motor but they have not been able to figure this problem out?
I have invested tons of money in this car and not able to enjoy all of this power due to this issue
Does anyone have any ideas on what to do?
Instructor
Joined: Jul 2009
Posts: 164
Likes: 10
Burning Brakes
Joined: Oct 2005
Posts: 1,089
Likes: 82
From: Kauhava, Finland
https://www.mrk-motorsports.com/gm-iac-pcms/
Burning Brakes
Joined: Oct 2005
Posts: 1,089
Likes: 82
From: Kauhava, Finland
Now, if you do have a problem with ETC TB and so called TAC module, at the moment the only way to fix it is to go with cable TB.
Trying that should be not too expensive, but you'll lose traction control in your 'Vette. If it matters..
Melting Slicks
Joined: Jul 2008
Posts: 3,002
Likes: 216
From: Houston Texas
2018 Corvette of Year Finalist
2017 C5 of Year Finalist
Check out the corvette forum thread that Pekka linked. I have a listing of everything that I have changed and it still didn't fix the problem.
Also, post up in this thread if you are a member to let HPTuners know that this problem still exists. It's actually been an issue since 2007.
https://www.hptuners.com/forum/showt...o-427-Corvette
Pekka have you switched any C5s or other cars from DBW to cable?
The only time I've needed traction control or more importantly active handling, is in the rain. I got caught in a downpour one time and the car hydroplaned even though I was at 45 mph on the highway. If it weren't for AH, the car would most likely have crashed.
Also, post up in this thread if you are a member to let HPTuners know that this problem still exists. It's actually been an issue since 2007.
https://www.hptuners.com/forum/showt...o-427-Corvette
Pekka have you switched any C5s or other cars from DBW to cable?
The only time I've needed traction control or more importantly active handling, is in the rain. I got caught in a downpour one time and the car hydroplaned even though I was at 45 mph on the highway. If it weren't for AH, the car would most likely have crashed.
Last edited by Turbo-Geist; Mar 29, 2017 at 12:23 PM.
Tech Contributor
Joined: Apr 2007
Posts: 10,924
Likes: 78
From: Forney Texas
I have a 2002 Z06 with an LSX 427, I have installed a Procharger F1X. Since the installation I constantly get a reduced engine power light and the engine goes to 2000 rpm and the throttle has no affect until I reset the computer. I understand the purpose of the reduced engine power light and this system. What I do not understand is why I keep getting this light?
The car goes to REP anytime I try to drive attempt to tromp on the throttle and the rear wheels spin, it immediately goes to REP and I have to go thru the reset on the computer. I have a Nick Williams throttle body on it now that is supposed to be made for supercharged motors. I have tried numerous throttle bodies and still get the same results. I have the car at the shop that built the motor but they have not been able to figure this problem out?
I have invested tons of money in this car and not able to enjoy all of this power due to this issue Does anyone have any ideas on what to do?
The car goes to REP anytime I try to drive attempt to tromp on the throttle and the rear wheels spin, it immediately goes to REP and I have to go thru the reset on the computer. I have a Nick Williams throttle body on it now that is supposed to be made for supercharged motors. I have tried numerous throttle bodies and still get the same results. I have the car at the shop that built the motor but they have not been able to figure this problem out?
I have invested tons of money in this car and not able to enjoy all of this power due to this issue
Does anyone have any ideas on what to do?You two guys send me your tunes if you, have HPT. PM me for my email.
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Burning Brakes
Joined: Oct 2005
Posts: 1,089
Likes: 82
From: Kauhava, Finland
Le Mans Master
Joined: Jul 2010
Posts: 5,982
Likes: 719
Thread Starter
Instructor
Joined: May 2013
Posts: 110
Likes: 13
From: Dixon Il
Ls2
Well after I switched to the LS2 throttle body all of my REP problems disappeared
I am running an F1X pro charger with 15 lbs of boost It made 1025 RWHP on 93 with a big pulley on the F1X. My tuner said I should try E85 and would gain a lot more RWHP! I can barely keep it between the white lines now, don't think I could use any more HP!
I am running an F1X pro charger with 15 lbs of boost It made 1025 RWHP on 93 with a big pulley on the F1X. My tuner said I should try E85 and would gain a lot more RWHP! I can barely keep it between the white lines now, don't think I could use any more HP!
Le Mans Master
Joined: Dec 2007
Posts: 8,375
Likes: 97
From: Somewhere in the Mid 9's TX
Nice! Saw the video online today.
This seems to be a common issue. When I bought my last C5 that I just sold, it did this every pull, even with the owner picking me up from the airport. 900 mile drive home, it kept doing it in the 875rwhp range. Raced buddies the 2 days the engine lived after I bought it, and it did the same thing.
My first new motor, same thing. That let go too.
Explained that to my last tuner before I sold it last month with a solid motor. Beat on the car after tuned to make sure it was good, and sure enough it was gone. Whatever Bret knows above seems my tuner does too because this is a common issue.
This seems to be a common issue. When I bought my last C5 that I just sold, it did this every pull, even with the owner picking me up from the airport. 900 mile drive home, it kept doing it in the 875rwhp range. Raced buddies the 2 days the engine lived after I bought it, and it did the same thing.
My first new motor, same thing. That let go too.
Explained that to my last tuner before I sold it last month with a solid motor. Beat on the car after tuned to make sure it was good, and sure enough it was gone. Whatever Bret knows above seems my tuner does too because this is a common issue.
Le Mans Master
Joined: Jul 2010
Posts: 5,982
Likes: 719
Nice! Saw the video online today.
This seems to be a common issue. When I bought my last C5 that I just sold, it did this every pull, even with the owner picking me up from the airport. 900 mile drive home, it kept doing it in the 875rwhp range. Raced buddies the 2 days the engine lived after I bought it, and it did the same thing.
My first new motor, same thing. That let go too.
Explained that to my last tuner before I sold it last month with a solid motor. Beat on the car after tuned to make sure it was good, and sure enough it was gone. Whatever Bret knows above seems my tuner does too because this is a common issue.
This seems to be a common issue. When I bought my last C5 that I just sold, it did this every pull, even with the owner picking me up from the airport. 900 mile drive home, it kept doing it in the 875rwhp range. Raced buddies the 2 days the engine lived after I bought it, and it did the same thing.
My first new motor, same thing. That let go too.
Explained that to my last tuner before I sold it last month with a solid motor. Beat on the car after tuned to make sure it was good, and sure enough it was gone. Whatever Bret knows above seems my tuner does too because this is a common issue.
Le Mans Master
Joined: Dec 2007
Posts: 8,375
Likes: 97
From: Somewhere in the Mid 9's TX
The amount of cars I've seen blow up on pump plus meth is staggering over 17 years. Personally, I think 900+ is too much with pump + meth. I stopped at 850 in my C6. Just not a lot of room for error. 700-800 is it for me.
OP, I'd leave the car at its power level if you're on a 4 bolt block. Maybe 1100, but definitely use Chuck's advise and go E. All those F1x cars that made 1200+ from our Houston shops.... Where are all of them now? All gone, blew up soon from multiple tuners. Leave it at a 1000-1100 on E and meth and call it a day. Badass car btw.
OP, I'd leave the car at its power level if you're on a 4 bolt block. Maybe 1100, but definitely use Chuck's advise and go E. All those F1x cars that made 1200+ from our Houston shops.... Where are all of them now? All gone, blew up soon from multiple tuners. Leave it at a 1000-1100 on E and meth and call it a day. Badass car btw.
Le Mans Master
Joined: Jul 2010
Posts: 5,982
Likes: 719
The amount of cars I've seen blow up on pump plus meth is staggering over 17 years. Personally, I think 900+ is too much with pump + meth. I stopped at 850 in my C6. Just not a lot of room for error. 700-800 is it for me.
OP, I'd leave the car at its power level if you're on a 4 bolt block. Maybe 1100, but definitely use Chuck's advise and go E. All those F1x cars that made 1200+ from our Houston shops.... Where are all of them now? All gone, blew up soon from multiple tuners. Leave it at a 1000-1100 on E and meth and call it a day. Badass car btw.
OP, I'd leave the car at its power level if you're on a 4 bolt block. Maybe 1100, but definitely use Chuck's advise and go E. All those F1x cars that made 1200+ from our Houston shops.... Where are all of them now? All gone, blew up soon from multiple tuners. Leave it at a 1000-1100 on E and meth and call it a day. Badass car btw.
