LT1 Throttle Cable
Le Mans Master
Joined: Aug 2004
Posts: 5,141
Likes: 7
From: Metairie Louisiana
Hey Doug/Case which cable in the below pic is for the cruise control or am I looking at the wrong thing? I had the ASR cover off last weekend tightening my plugs but I didn't see a way to remove these cables. I still havn't been able to resolve the cable issue. At the track yesterday on my first run it was way low and again no nitrous. As I was sitting in the lanes waiting I used my method from before. I pushed the button in, pulled the cable all the way to the windshield, then got in and floored it to fix the high idle. On that run I gained 12mph on the top end and ran a second faster. 
Obviously the nitrous worked well and was reading WOT. I got back in line for the next run and ran again. This time low throttle again and the performance was back to where it was. Also nitrous not working again. 
Why does it keep going back to less than full throttle? What am I doing wrong here?
Thanks
Obviously the nitrous worked well and was reading WOT. I got back in line for the next run and ran again. This time low throttle again and the performance was back to where it was. Also nitrous not working again. Why does it keep going back to less than full throttle? What am I doing wrong here?Thanks
Le Mans Master
Joined: Aug 2005
Posts: 5,002
Likes: 5
From: No Opti Here Tn
St. Jude Donor '06
Hey Doug/Case which cable in the below pic is for the cruise control or am I looking at the wrong thing? I had the ASR cover off last weekend tightening my plugs but I didn't see a way to remove these cables. I still havn't been able to resolve the cable issue. At the track yesterday on my first run it was way low and again no nitrous. As I was sitting in the lanes waiting I used my method from before. I pushed the button in, pulled the cable all the way to the windshield, then got in and floored it to fix the high idle. On that run I gained 12mph on the top end and ran a second faster. Obviously the nitrous worked well and was reading WOT. I got back in line for the next run and ran again. This time low throttle again and the performance was back to where it was. Also nitrous not working again. Why does it keep going back to less than full throttle? What am I doing wrong here?
Thanks
Obviously the nitrous worked well and was reading WOT. I got back in line for the next run and ran again. This time low throttle again and the performance was back to where it was. Also nitrous not working again. Why does it keep going back to less than full throttle? What am I doing wrong here?Thanks
BTW the ZR1 has this adjustment also
Instructor
Joined: Sep 2004
Posts: 146
Likes: 1
From: Rancho Mirage California
"Hi All,
I read some other thread on here about how to adjust your throttle cable.
If you have no idea what this is, GO DO IT NOW!!! NOW!!!..........driving around town, I could definitely feel the extra throttle.
So, if you want one of the fastest, easiest, and cheapest mods to your car for performance gain, go check your throttle!! 
John
I read some other thread on here about how to adjust your throttle cable.
If you have no idea what this is, GO DO IT NOW!!! NOW!!!..........driving around town, I could definitely feel the extra throttle.
So, if you want one of the fastest, easiest, and cheapest mods to your car for performance gain, go check your throttle!!
John
With the car off, I simply depressed the 'THROTTLE CABLE ADJUSTMENT BUTTON' on the 'THROTTLE CABLE (ASR MODULE TO BUTTERFLY)', and slid the housing (indicated by the two asterisks) TOWARD the ASR module until it stopped moving (noting the tension increase on the 'THROTTLE CABLE AT BUTTERFLY'). After doing this, I depressed the gas pedal (with the car off), and noted that the throttle now opened up all the way, and hit the stop (heard the previously mentioned "Clink" as it hit the stop). Great! Now I shut the hood, and took her for a test drive....WOW!
Power which I never knew was there was suddenly unleashed....Great thread, everyone with an LT1 should check their throttle, and perform adjustment as necessary! 
Thread Starter
Burning Brakes
Joined: May 2006
Posts: 904
Likes: 0
From: Boynton Beach FL
I just performed this adjustment on my '92, and OMG WHAT A DIFFERENCE!!! Pictured below is the throttle cable/ASR assembly on my Vette....
With the car off, I simply depressed the 'THROTTLE CABLE ADJUSTMENT BUTTON' on the 'THROTTLE CABLE (ASR MODULE TO BUTTERFLY)', and slid the housing (indicated by the two asterisks) TOWARD the ASR module until it stopped moving (noting the tension increase on the 'THROTTLE CABLE AT BUTTERFLY'). After doing this, I depressed the gas pedal (with the car off), and noted that the throttle now opened up all the way, and hit the stop (heard the previously mentioned "Clink" as it hit the stop). Great! Now I shut the hood, and took her for a test drive....WOW! Power which I never knew was there was suddenly unleashed....Great thread, everyone with an LT1 should check their throttle, and perform adjustment as necessary!
With the car off, I simply depressed the 'THROTTLE CABLE ADJUSTMENT BUTTON' on the 'THROTTLE CABLE (ASR MODULE TO BUTTERFLY)', and slid the housing (indicated by the two asterisks) TOWARD the ASR module until it stopped moving (noting the tension increase on the 'THROTTLE CABLE AT BUTTERFLY'). After doing this, I depressed the gas pedal (with the car off), and noted that the throttle now opened up all the way, and hit the stop (heard the previously mentioned "Clink" as it hit the stop). Great! Now I shut the hood, and took her for a test drive....WOW!
Power which I never knew was there was suddenly unleashed....Great thread, everyone with an LT1 should check their throttle, and perform adjustment as necessary! Cool, huh?
Le Mans Master
Joined: Aug 2004
Posts: 5,141
Likes: 7
From: Metairie Louisiana
I just finished adjusting it again. This time I removed the clip on the ASR servo box. There was about a quarter inch to half inch slack here at the end of the cable. I tried moving it to a further hole but it would not reach. I had to push the button in on the throttle cable and move it just a bit. It reached the next hole at the servo box and took the slack out. The FSM says not to move the throttle cable because it may not go back to the correct idle, but being frustrated I tried it. It seems to have fixed the not reaching WOT issue but I don't know if it will stay fixed. It is idling just a bit higher. It now idles around 800 rmp but if I push in on the throttle lever it quiets down to about 700. I believe stock idel is around 600rpm. Is there any thing I should do to re-adjust the idle now? I think the WOT will keep working but I don't know if the higher idle will be a problem. Suggestions?
Thanks
Thanks
Last edited by rickneworleansla; May 20, 2007 at 02:16 PM.
Melting Slicks
Joined: Nov 2003
Posts: 2,679
Likes: 1
From: South Amboy NJ
Okay guys, here is the be all end all answer for 93 models from the FSM. It probably works for other years, but I do not guarantee anything. It would be helpful if someone could make a sticky out of these images for future reference. All of the previous posts reflect a variation to this procedure but each misses the first part which seems like an important point.
Enjoy,
Dave
If anyone wants higher resolution pictures, shoot me a PM with your email address and I will be happy to send them to you.
Enjoy,
Dave
If anyone wants higher resolution pictures, shoot me a PM with your email address and I will be happy to send them to you.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
Instructor
Joined: Apr 2006
Posts: 108
Likes: 0
From: Green Cove Springs Florida
I had checked the throttle cable on my 95 last week and found out that is was only opening about 80% of the way open. Pushed on thebutton on the assy where all the cables come into and the slack in the cable disappeared and violla I had wide open throttle again. What a difference in performance.
Cmanhome
Cmanhome
Le Mans Master
Joined: Aug 2004
Posts: 5,141
Likes: 7
From: Metairie Louisiana
I had checked the throttle cable on my 95 last week and found out that is was only opening about 80% of the way open. Pushed on thebutton on the assy where all the cables come into and the slack in the cable disappeared and violla I had wide open throttle again. What a difference in performance.
Cmanhome
Cmanhome
Le Mans Master
Joined: Aug 2004
Posts: 5,141
Likes: 7
From: Metairie Louisiana
Racer
Joined: Nov 2006
Posts: 297
Likes: 0
From: Wilmington NC
Melting Slicks
Joined: Jul 2004
Posts: 3,277
Likes: 32
From: Mission Viejo California
My throttle position cable is out of wack. I also noticed that the shifting is taking way to long to do at part throttle. Are the two interrelated? Will fixing my throttle body not going 100% affect my trans? My car is a 92. Or do I need to adjust the tv cable per the photos that blackrose posted?
Melting Slicks
Joined: Jul 2004
Posts: 3,277
Likes: 32
From: Mission Viejo California
adjusted both the trans and throttle cable per the thread. It works much better now. Thanks guys!
Also, my throttle cable adjusted to the left of the button on my 92. I mean to the asr box side of the button you push.
Also, my throttle cable adjusted to the left of the button on my 92. I mean to the asr box side of the button you push.
Melting Slicks
Joined: Feb 2005
Posts: 2,135
Likes: 0
From: Sebastian Florida
St. Jude Donor '06
Okay, think I know the answer BUT. I adjusted mine all the out on my 93 and I still am at only 90% with the pedal down.
a) does this mean I need new cables?
b) Do I have to adjust the cable from the pedal to the ASR?
a) does this mean I need new cables?
b) Do I have to adjust the cable from the pedal to the ASR?
Burning Brakes
Joined: Apr 2006
Posts: 765
Likes: 0
From: Houston Texas
I have a '94 and would like to know where the 'early-late' begins and ends. My VIN# ends with 1000338 and was built in August, 1993 - I'm assuming it is an early version.
My '94 FSM does show early-late pictures of the T/B accelerator cable adjustment as Casethecorvetteman stated, and the proceedure is different on early-late. There is no trans. cable adjustment. Is '94 when the A4 electronic trans. came in the picture?
I can't check my car because it is in the shop getting a HP lift but is supposed to be ready tomorow (Monday). Can't wait!
When ordering the MSD ProBillet distributor, they showed early-late '94's, but all '92-'94's are the same for the opti and changed in '95. So the early-late opti thing IS a screw-up.
Oh, Case, do you have to read your FSM looking in a mirror since it is right-hand drive?
My '94 FSM does show early-late pictures of the T/B accelerator cable adjustment as Casethecorvetteman stated, and the proceedure is different on early-late. There is no trans. cable adjustment. Is '94 when the A4 electronic trans. came in the picture?
I can't check my car because it is in the shop getting a HP lift but is supposed to be ready tomorow (Monday). Can't wait!
When ordering the MSD ProBillet distributor, they showed early-late '94's, but all '92-'94's are the same for the opti and changed in '95. So the early-late opti thing IS a screw-up.
Oh, Case, do you have to read your FSM looking in a mirror since it is right-hand drive?
Burning Brakes
Joined: Apr 2006
Posts: 765
Likes: 0
From: Houston Texas
So, question b) is automatically adjusted by pushing the accelerator all the way down to WOT after you adjust the T/B accelerator cable. It ratchets for correct adjustment, but don't remove the 1/8" drill bit until after the accelerator WOT adjustment is made.