Electric Throttle will not open if I press on the brakes.

[nycblazer]

Hello guys.
The scenario is this, got a 2008 Corvette LS3 engine mated to a T56 using a TBSS harness with 12618164 OS. Switched over all the LS3 tune into the TBSS OS. Now I can't step or floor the throttle because it won't respond, I kinda have to slowly press and feather the pedal to get a response. Also if I'm pressing the brakes at the same time I give it gas the throttle won't do anything what can this be?
The throttle response is also very slow. I am able to drive it around like this but it's very slow, and it wastes alot of gas.
The pedal on the VCM Scanner shows it opening to 40% only.

Any help will be greatly appreciated, thanks.

The ECM is from a 2008 TBSS / 12618164 OS
The Electronic Throttle is off the 2008 Vette
The Electronic Gas pedal is off a 2008 Corvette C6.

Could it be the Vette Electronic Gas pedal is having conflict with the TBSS OS??

[Redline MS]

One thing to check is under the TCS parameters for disabling BTM with traction control off.

I'm not sure where HPT puts it but find it..

HT

[Sparkman]

One thing to check is under the TCS parameters for disabling BTM with traction control off.

I'm not sure where HPT puts it but find it..

HT

That's the first thing I would check. You should be able to find this in: Engine -> Torque Management -> General Tab

Spark

[nycblazer]

I tried a few thing and I'm still not being able to rev when i press the brakes. its weird. Even when I dont press the brakes the Electric throttle is not reving all the way, it dies out.

Here's a copy of the current tune. Can someone take a look at it to see what am i doing wrong. My eyes are burning and I'm going Cross eyed from looking and searching for hours.

thanks in advance.

[nycblazer]

I tried a few other things today like switching it from auto to manual, turned off torque managment and it is still the same. eeeh

[Chris@HPTuners]

you still have a lot of torque management enabled.

max out the Brake Torque Management Table, ETC Tip in limiting is still enabled. You might need to change the default trans limit to something higher if this was an auto.

[nycblazer]

you still have a lot of torque management enabled.

max out the Brake Torque Management Table, ETC Tip in limiting is still enabled. You might need to change the default trans limit to something higher if this was an auto.

Okay I maxed out the BTM table all to 366.7 and dissabled ETC, I also switch the trany from Auto to Manual. Gonna give this one a try when i get out of work later on this afternoon.
Do I write calibration only or do a write entire?

I''ll keep it posted. thanks.

[nycblazer]

OKAY I loaded this current file, and it still does the same. I give it gas and it accelerates a little in the begginiing of the throttle, if I floor throttle it decelarates and it just idles normal with the throttle to the floor.
it has a bunch of DTC codes and I also don't the Cats installed yet. whaT can it be.

[vette_c6]

use this file that i gave u ,,,
but i need you to SEND me your ORIGINAL FILE

i havent tocuhed TB Car before ,, because V8 doesnt come to my country
i need your STOCK one

the other thing ,,, Tell me what mods are in your Car


so i need 3 things from u
1- shot me with your STOCK FILE ( ORIGINAL ONE )
2- tell me exactly what mods are in your Car
3- Try to upload the STOCK Original file and test your car ,, then upload my file and test your car

waiting for your replay

cheers

[Chris@HPTuners]

OKAY I loaded this current file, and it still does the same. I give it gas and it accelerates a little in the begginiing of the throttle, if I floor throttle it decelarates and it just idles normal with the throttle to the floor.
it has a bunch of DTC codes and I also don't the Cats installed yet. whaT can it be.

well if it has a bunch of DTC's you could start by listing them

[nycblazer]

use this file that i gave u ,,,
but i need you to SEND me your ORIGINAL FILE

i havent tocuhed TB Car before ,, because V8 doesnt come to my country
i need your STOCK one

the other thing ,,, Tell me what mods are in your Car


so i need 3 things from u
1- shot me with your STOCK FILE ( ORIGINAL ONE )
2- tell me exactly what mods are in your Car
3- Try to upload the STOCK Original file and test your car ,, then upload my file and test your car

waiting for your replay

cheers

Coool vette_c6 and Chris
Okay the stock file since this is an E67 ECM, I used a 2008 Trailblazer SS OS. That OS system and Stock TBSS file is for the 6.0L engine with an automatic. This file I needed to swap all the 6.2L settings and the tranny settings to manual.

Mods are 6.2L 2008 Corvette LS3 Engine Stock with only headers, and for now no cats, mated to a T56 manual transmission, 3.42 Gears, 27 inch tall tires.

The speedometer is also off by a bunch, in the scanner it shows 158 MPH I wish on the dash it only goes up to 10-20 MPH, even if I'm doing 70 MPH

I installed your file and it sounds better the acceleration. I didnt get totest drive it, and also the Electronic Pedal is still doing the same thing. when I press the brake and gas at the same time it wont accelerat at all, if i dont hit the brake and give it gas, it accelerates but very little, if i step on the gas half way or more it just idles.

well if it has a bunch of DTC's you could start by listing them

I'm also attaching the DTC codes Chris

In the scan you can see where the throttle opens up to 38%

[Chris@HPTuners]

the problem is P2138, it is likely giving you REP.

You can log ETC Source and ETC TqMgt Type in the scanner to confirm.

[vette_c6]

i am really confuesd now
i change the Map sensor offsetts back to stock
removed some codes
runned the car in open lope
check ur MAF
check your MAP sensor

in the scanner o relized that your speed in kept in 150 miles this range

this is open lope file just for checking if some if this setting would help u
its not a tune
i have tuned many swaped engine cars ,, many problems with sensors ,and they get Tune in open lope most time
try this file and shot us with update ,,
not in your next log
start the scanner for few seconds before you run the car
i would like to look at the map numbers in the scanner
also log your maf with HZ
add it in your primary table
if possible log wideband
you will notice that the car smells fuel

before you run the car
remove the maff and reinstall it
remove the throttle Connectors and reinstall them ,, check that everything is placed

the otherthing is if you have one of your friends have the same TB
hire it ,, swaps yours with his ,, this might be from the throttle ,,
do that just for test

keep me updated ,, im very intrested in that
good luck

[nycblazer]

Ok I started the scanner before starting the engine, I then took the car for a quick spin. I'm smelling gas now. I also removed and reinstalled the MAF and throttle connector.

Here's the scan.


Let me know what you think.
Thanks

[vectorbundle]

have you tried switching to a manual OS? say 07 CTSV. or 09 ZR1 (which would require a different E67). plus you are using vette throttle and pedal. is there particular reason you are staying with TBSS automatic base tune?

[vette_c6]

true ,, the car smells fuel because its in open lope
the reson i asked u to log your car before you start the car is to check your map sensor

you should be in 80 KPA with the key off
your speed sensor is not working by the way

to be honest with u ,, i dont know how to help u ,, its better to take it to proffessional shop to help u

[BigDaddyCool]

You need alot more scanner data, I read through the tread and looked through your files and they look fine......

You need to log alot more stuff, check for DTC's and so on..... Cant really suggest anything without a better log really.

See my attached log to give you an idea of what I log as a generic run....... ignore my histograms.

[Nodnarb]

You need to change your injector data over to 08 Vette data. Your trims are pulling 25%.

Your MAF appears to be non functional.

I'd load the VE coefficients from an 08 Vette also.

[vette_c6]

i guess i was wrong
in your scanner ,, scan2 file
you logged before start and you map sensor is 81 ,,, it should be 100


sorry for my mistake in the older post

[gn2beatu]

Not sure if this will help your speedo issue, but the TBSS uses a 4L70 trans. That trans has two speed sensors. So your speedo for it to work will need some kind of TCM patch if what I remember correctly reading on the tbssowners.com site. Maybe someone here can give some more info. G/L in fixing your isssues.