C5 Tech Corvette Tech/Performance: LS1 Corvette Technical Info, Internal Engine, External Engine, Tech Topics, Basic Tech, Maintenance, How to Remove & Replace
Sponsored by:
Sponsored by:

HELP!! No throttle response after FAST install

Thread Tools
 
Search this Thread
 
Old Mar 3, 2010 | 10:29 PM
  #1  
0331MARINE's Avatar
0331MARINE
Thread Starter
Safety Car
Supporting Member
10 Year Member
 
Joined: Oct 2007
Posts: 3,903
Likes: 1
From: You know your drunk when you swerve to miss the tree then you realize its your air freshener! Covington Ga
Default HELP!! No throttle response after FAST install

Ok car starts rev to 2000rpms( by it self) and no throttle response. Here are the codes
P1120 TPS 1 Circuit
P1220 TPS 2 Circuit
P1516 TAC Position Performmance
Is it because it doesnt know what to do with the FAST and 90mm tb on it or what?
What can I do if anything?

Last edited by 0331MARINE; Mar 3, 2010 at 10:33 PM.
Reply
Old Mar 3, 2010 | 10:39 PM
  #2  
lucky131969's Avatar
lucky131969
Tech Contributor
15 Year Member
Active Streak: 30 Days
Community Builder
Liked
 
Joined: Jan 2007
Posts: 19,422
Likes: 1,146
From: Dyer, IN
Default

Originally Posted by 0331MARINE
Ok car starts rev to 2000rpms( by it self) and no throttle response. Here are the codes
P1120 TPS 1 Circuit
P1220 TPS 2 Circuit
P1516 TAC Position Performmance
Is it because it doesnt know what to do with the FAST and 90mm tb on it or what?
What can I do if anything?
Are you using an adapter for the factory wiring to the 90mm TB? If so, the adapters have been known to be wired wrong.
Reply
Old Mar 3, 2010 | 10:42 PM
  #3  
Y2Kvert4me's Avatar
Y2Kvert4me
Race Director
 
Joined: Oct 2002
Posts: 16,477
Likes: 26
From: Gone
CI 6-7-8-9-10 Veteran
St. Jude Donor '03
Default

You have no throttle response because the car goes into Reduced Power mode when the P1516 is set.

I'd say you have some connection issues with the new TB. The TPS (throttle position sensor on the TB) errors seem to confirm that. What TB are you using and harness adapter (if not using a billet TB)?
Reply
Old Mar 3, 2010 | 10:45 PM
  #4  
0331MARINE's Avatar
0331MARINE
Thread Starter
Safety Car
Supporting Member
10 Year Member
 
Joined: Oct 2007
Posts: 3,903
Likes: 1
From: You know your drunk when you swerve to miss the tree then you realize its your air freshener! Covington Ga
Default

Im using a TPIS 90mm TB so no adapter. The TPS sensor is brand new. It revs to 2k by itself. I can push the gas and I get nothing.
Reply
Old Mar 3, 2010 | 11:00 PM
  #5  
lucky131969's Avatar
lucky131969
Tech Contributor
15 Year Member
Active Streak: 30 Days
Community Builder
Liked
 
Joined: Jan 2007
Posts: 19,422
Likes: 1,146
From: Dyer, IN
Default

Originally Posted by 0331MARINE
Im using a TPIS 90mm TB so no adapter. The TPS sensor is brand new. It revs to 2k by itself. I can push the gas and I get nothing.
Sorry for asking, but did you follow the instructions for transferring the motor and TPS to the new TB?
Reply
Old Mar 3, 2010 | 11:01 PM
  #6  
0331MARINE's Avatar
0331MARINE
Thread Starter
Safety Car
Supporting Member
10 Year Member
 
Joined: Oct 2007
Posts: 3,903
Likes: 1
From: You know your drunk when you swerve to miss the tree then you realize its your air freshener! Covington Ga
Default

Originally Posted by lucky131969
Sorry for asking, but did you follow the instructions for transferring the motor and TPS to the new TB?
It was already put on when I got it. But then again it is a used TB
Reply
Old Mar 3, 2010 | 11:07 PM
  #7  
lucky131969's Avatar
lucky131969
Tech Contributor
15 Year Member
Active Streak: 30 Days
Community Builder
Liked
 
Joined: Jan 2007
Posts: 19,422
Likes: 1,146
From: Dyer, IN
Default

Originally Posted by 0331MARINE
It was already put on when I got it. But then again it is a used TB
Ok, just in case:

Reply
Old Mar 3, 2010 | 11:10 PM
  #8  
lucky131969's Avatar
lucky131969
Tech Contributor
15 Year Member
Active Streak: 30 Days
Community Builder
Liked
 
Joined: Jan 2007
Posts: 19,422
Likes: 1,146
From: Dyer, IN
Default

Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

 Joe Kucinski
story-1

How Much Horsepower Every Corvette Engine "LOST" in 1972

 Joe Kucinski
story-2

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

 Michael S. Palmer
story-3

Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

 Joe Kucinski
story-4

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

 Joe Kucinski
story-5

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo
story-6

Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

 Joe Kucinski
story-7

Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

 Verdad Gallardo
story-8

Top 10 Corvettes Coming to Mecum Indy 2026!

 Brett Foote
story-9

Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

 Michael S. Palmer
Old Mar 3, 2010 | 11:10 PM
  #9  
0331MARINE's Avatar
0331MARINE
Thread Starter
Safety Car
Supporting Member
10 Year Member
 
Joined: Oct 2007
Posts: 3,903
Likes: 1
From: You know your drunk when you swerve to miss the tree then you realize its your air freshener! Covington Ga
Default

Ill be right back. Im going to go take it off and check it.
Reply
Old Mar 3, 2010 | 11:34 PM
  #10  
0331MARINE's Avatar
0331MARINE
Thread Starter
Safety Car
Supporting Member
10 Year Member
 
Joined: Oct 2007
Posts: 3,903
Likes: 1
From: You know your drunk when you swerve to miss the tree then you realize its your air freshener! Covington Ga
Default

Took it off. It all looks good. Put it back together and still does it......
Reply
Old Mar 3, 2010 | 11:42 PM
  #11  
lucky131969's Avatar
lucky131969
Tech Contributor
15 Year Member
Active Streak: 30 Days
Community Builder
Liked
 
Joined: Jan 2007
Posts: 19,422
Likes: 1,146
From: Dyer, IN
Default

Originally Posted by 0331MARINE
Took it off. It all looks good. Put it back together and still does it......
PM sent.
Reply
Old Mar 4, 2010 | 11:32 AM
  #12  
zeevette's Avatar
zeevette
Race Director
 
Joined: Sep 2005
Posts: 11,060
Likes: 291
From: Pasco WA
Default

Could you have cracked the bottom part of the manifold, installing it over factory valley cover bolts?
Reply
Old Mar 4, 2010 | 01:30 PM
  #13  
WKMCD's Avatar
WKMCD
Race Director
15 Year Member
 
Joined: Dec 2004
Posts: 13,760
Likes: 75
From: Haymarket VA
Default

Sounds like you have an air leak for a start. The car shouldn't idle at 2k - obviously.
Reply
Old Mar 4, 2010 | 03:41 PM
  #14  
Y2Kvert4me's Avatar
Y2Kvert4me
Race Director
 
Joined: Oct 2002
Posts: 16,477
Likes: 26
From: Gone
CI 6-7-8-9-10 Veteran
St. Jude Donor '03
Default

Originally Posted by WKMCD
Sounds like you have an air leak for a start. The car shouldn't idle at 2k obviously.
That high of idle flare at startup is a very typical result when bolting on a FAST and 90mm TB without tuning for it.

And he won't be able to even get to the tuning until he solves his throttle position sensor issue and stays out of REP mode.

An air leak doesn't cause failure of two separate TPS circuits.
Reply
Old Mar 4, 2010 | 06:36 PM
  #15  
0331MARINE's Avatar
0331MARINE
Thread Starter
Safety Car
Supporting Member
10 Year Member
 
Joined: Oct 2007
Posts: 3,903
Likes: 1
From: You know your drunk when you swerve to miss the tree then you realize its your air freshener! Covington Ga
Default

Originally Posted by zeevette
Could you have cracked the bottom part of the manifold, installing it over factory valley cover bolts?
Not over stock bolts.

Originally Posted by Y2Kvert4me
That high of idle flare at startup is a very typical result when bolting on a FAST and 90mm TB without tuning for it.

And he won't be able to even get to the tuning until he solves his throttle position sensor issue and stays out of REP mode.

An air leak doesn't cause failure of two separate TPS circuits.
Im going to put the old TPS on and see what happens.
Reply
Old Mar 4, 2010 | 07:03 PM
  #16  
0331MARINE's Avatar
0331MARINE
Thread Starter
Safety Car
Supporting Member
10 Year Member
 
Joined: Oct 2007
Posts: 3,903
Likes: 1
From: You know your drunk when you swerve to miss the tree then you realize its your air freshener! Covington Ga
Default

Could the motor be bad on the TB?
Reply
Old Mar 4, 2010 | 07:42 PM
  #17  
lucky131969's Avatar
lucky131969
Tech Contributor
15 Year Member
Active Streak: 30 Days
Community Builder
Liked
 
Joined: Jan 2007
Posts: 19,422
Likes: 1,146
From: Dyer, IN
Default

Originally Posted by 0331MARINE
Could the motor be bad on the TB?
Aren't you just transferring your old motor to the new TB? Also, did you check the index of the TPS per the instructions?
Reply

Get notified of new replies

To HELP!! No throttle response after FAST install

Old Mar 4, 2010 | 07:47 PM
  #18  
phils C5 vette's Avatar
phils C5 vette
Le Mans Master
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Nov 2003
Posts: 8,004
Likes: 250
From: Tampa Fl
St. Jude Donor '12-'13-'14
Default

pull each of your electrical connection you undid installing your fast specificall to your throttle body. Take a long, slow look at your male and female connections, and look at a bend male end going into a female, or a bend in female.

Striaghten out the male connection, slowly and gentlly reconnection the electrical connection and clear codes.

You'll be good to go
Reply
Old Mar 4, 2010 | 08:10 PM
  #19  
0331MARINE's Avatar
0331MARINE
Thread Starter
Safety Car
Supporting Member
10 Year Member
 
Joined: Oct 2007
Posts: 3,903
Likes: 1
From: You know your drunk when you swerve to miss the tree then you realize its your air freshener! Covington Ga
Default

Originally Posted by lucky131969
Aren't you just transferring your old motor to the new TB? Also, did you check the index of the TPS per the instructions?
No the TB cam with the motor and a TPS
Reply
Old Mar 4, 2010 | 08:11 PM
  #20  
lucky131969's Avatar
lucky131969
Tech Contributor
15 Year Member
Active Streak: 30 Days
Community Builder
Liked
 
Joined: Jan 2007
Posts: 19,422
Likes: 1,146
From: Dyer, IN
Default

Originally Posted by 0331MARINE
No the TB cam with the motor and a TPS
I see.....well that changes things a bit.....condition unknown....
Reply



All times are GMT -4. The time now is 12:14 PM.

story-0
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-1
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-2
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-3
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-4
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-5
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE
story-6
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

Slideshow: Ranking the top 10 Corvette engines by torque output.

By Joe Kucinski | 2026-05-05 11:58:09


VIEW MORE
story-7
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

Slideshow: A Corvette pace car nearly matching IndyCar speeds sounds exaggerated, until you look at the numbers.

By Verdad Gallardo | 2026-05-04 20:03:36


VIEW MORE
story-8
Top 10 Corvettes Coming to Mecum Indy 2026!

Among a rather large group of them.

By Brett Foote | 2026-05-04 13:56:44


VIEW MORE
story-9
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Slideshow: the top 10 things Corvette owners want in the C9 Corvette

By Michael S. Palmer | 2026-04-30 12:41:15


VIEW MORE