T V Cable fighting throttle - can't accelerate - help !
Thread Starter
Burning Brakes
Joined: Dec 2002
Posts: 1,199
Likes: 4
From: Cairns Australia
T V Cable fighting throttle - can't accelerate - help !
My vette is a 1988, everything stock standard - I fitted a new throttle cable 2 days ago and suddenly I can't press the throttle - I discovered that the tv cable is fighting the throttle cable - no problem with engine off -but once in gear it's almost impossible to accelerate.
I had a bad experience last week, these two things may be related - I posted about my scary experience but in case it helps point to the problem here it is - " I was accelerating at WOT from a rolling start and there was an enormous BANG, at high revs, probably at the 1 -2 shift - I thought I'd broken something really serious and was amazed to find I still had drive. This also happened 8 months ago and they are the only two times I've really given it maximum throttle like that. It almost seems as if instead of changing to 2nd, the revs go ballistic for a split second, as if there's no drive, then Crunch the car feels like it's been hit by a scud missile. I can't believe it's still driving around as if there's nothing wrong."
Hope someone tell me what the heck's going on
S'nut
[Modified by Stingraynut, 8:02 PM 2/14/2004]
I had a bad experience last week, these two things may be related - I posted about my scary experience but in case it helps point to the problem here it is - " I was accelerating at WOT from a rolling start and there was an enormous BANG, at high revs, probably at the 1 -2 shift - I thought I'd broken something really serious and was amazed to find I still had drive. This also happened 8 months ago and they are the only two times I've really given it maximum throttle like that. It almost seems as if instead of changing to 2nd, the revs go ballistic for a split second, as if there's no drive, then Crunch the car feels like it's been hit by a scud missile. I can't believe it's still driving around as if there's nothing wrong."
Hope someone tell me what the heck's going on
S'nut
[Modified by Stingraynut, 8:02 PM 2/14/2004]
Thread Starter
Burning Brakes
Joined: Dec 2002
Posts: 1,199
Likes: 4
From: Cairns Australia
Re: T V Cable fighting throttle - can't accelerate - help ! (Stingraynut)
Should I adjust the TV cable as per the manual ?
Could it have slipped when I installed the new Throttle cable ? (I don't think so)
When I installed the new cable, I took the car for a run round the block and it seemed OK but a bit stiff, I was disappointed to spend so much effort on a new cable and not get a smooth throttle, but I now think that my problems of starting off without lurching the throttle were early signs of this current problem.
To get any throttle now I have to jab the pedal hard, I can actually feel it bending at the pivot point through my shoes - this is serious.
The TV is on the opposite end of the fulcrum so when the throttle cable pulls, it pulls against the TV cable
anyone got any clues
thanks
S'nut
Could it have slipped when I installed the new Throttle cable ? (I don't think so)
When I installed the new cable, I took the car for a run round the block and it seemed OK but a bit stiff, I was disappointed to spend so much effort on a new cable and not get a smooth throttle, but I now think that my problems of starting off without lurching the throttle were early signs of this current problem.
To get any throttle now I have to jab the pedal hard, I can actually feel it bending at the pivot point through my shoes - this is serious.
The TV is on the opposite end of the fulcrum so when the throttle cable pulls, it pulls against the TV cable
anyone got any clues
thanks
S'nut
Drifting
Joined: Oct 2003
Posts: 1,594
Likes: 0
From: CALGARY ab
Re: T V Cable fighting throttle - can't accelerate - help ! (Stingraynut)
adjust the tv cable by the manual:
first push in the adjustment tab, then push the cable towards the transmission, and final while you have a friend depressing the gas pedal, push in the adjustment tab and move the cable out as so to make for no slack while in open throttle postiton. release adjustment tab. you may now test drive to see if it operates properly. small adjustments may be required after set up...
first push in the adjustment tab, then push the cable towards the transmission, and final while you have a friend depressing the gas pedal, push in the adjustment tab and move the cable out as so to make for no slack while in open throttle postiton. release adjustment tab. you may now test drive to see if it operates properly. small adjustments may be required after set up...
Thread Starter
Burning Brakes
Joined: Dec 2002
Posts: 1,199
Likes: 4
From: Cairns Australia
Re: T V Cable fighting throttle - can't accelerate - help ! (korvette4u)
My throttle set up is stock standard, why would you need a picture ?
The TV cable goes to the top of the TB lever and the Throttle and Cruise cables goes to the bottom
When the engine is OFF the throttle is easy and smooth.
With the engine on and in gear, I can't accelerate without jabbing the pedal hard, I can feel the pivot point through my shoes - the pedal is bending !!!!
The TV cable is holding the pedal back - (as they are either side of the fulcrum of the TB lever.)
korvette4u - thanks for adjusting tv cable info - I'm reluctant to touch anything until I know what's happening - smacko adjusted his and 2 hrs later his tranny broke!
I can't see how I changed anything when I fitted the new throttle cable, of course anything's possible but I test drove the car afterwards and everything was OK although I was disappointed that the new throttle hadn't made everything smooth as.
I now realise that this problem began a few months ago and it was making my throttle slightly stiff when driving off from stop - I got a new throttle cable because I thought it was the problem. This new really hard stiffness started suddenly yesterday.
I'm wondering if the Transmission valve is jammed or has gone past it's travel opr something like that - any transmission experts out there ?
S'nut
The TV cable goes to the top of the TB lever and the Throttle and Cruise cables goes to the bottom
When the engine is OFF the throttle is easy and smooth.
With the engine on and in gear, I can't accelerate without jabbing the pedal hard, I can feel the pivot point through my shoes - the pedal is bending !!!!
The TV cable is holding the pedal back - (as they are either side of the fulcrum of the TB lever.)
korvette4u - thanks for adjusting tv cable info - I'm reluctant to touch anything until I know what's happening - smacko adjusted his and 2 hrs later his tranny broke!
I can't see how I changed anything when I fitted the new throttle cable, of course anything's possible but I test drove the car afterwards and everything was OK although I was disappointed that the new throttle hadn't made everything smooth as.
I now realise that this problem began a few months ago and it was making my throttle slightly stiff when driving off from stop - I got a new throttle cable because I thought it was the problem. This new really hard stiffness started suddenly yesterday.
I'm wondering if the Transmission valve is jammed or has gone past it's travel opr something like that - any transmission experts out there ?
S'nut
Drifting
Joined: Oct 2003
Posts: 1,594
Likes: 0
From: CALGARY ab
Re: T V Cable fighting throttle - can't accelerate - help ! (Stingraynut)
korvette4u - thanks for adjusting tv cable info - I'm reluctant to touch anything until I know what's happening - smacko adjusted his and 2 hrs later his tranny broke!
I can't see how I changed anything when I fitted the new throttle cable, of course anything's possible but I test drove the car afterwards and everything was OK although I was disappointed that the new throttle hadn't made everything smooth as.
S'nut
Thread Starter
Burning Brakes
Joined: Dec 2002
Posts: 1,199
Likes: 4
From: Cairns Australia
Re: T V Cable fighting throttle - can't accelerate - help ! (korvette4u)
THANK YOU korvette4u - this is the link I've been searching for - I found it early last year and thought it very good, couldn't find it again.
I'm fully into research mode, as you can imagine. Found a lot of stuff, hard to sort out the good from the bad. Seems the 700R4 is expected to die after 80,000 miles (I've done 100,000) - not good news. A valve body recon with improved parts seems the go, if the bands hold up. But I don't really know what I'm talking about - yet.
I'm booked in for a tranny service and inspection on Tuesday.
I'll adjust the TV cable and see what happens. If the cable hasn't moved then a stuck Transmission valve looks like a possible culprit.From my research it could
thanks again
S'nut
I'm fully into research mode, as you can imagine. Found a lot of stuff, hard to sort out the good from the bad. Seems the 700R4 is expected to die after 80,000 miles (I've done 100,000) - not good news. A valve body recon with improved parts seems the go, if the bands hold up. But I don't really know what I'm talking about - yet.
I'm booked in for a tranny service and inspection on Tuesday.
I'll adjust the TV cable and see what happens. If the cable hasn't moved then a stuck Transmission valve looks like a possible culprit.From my research it could
thanks again
S'nut
Drifting
Joined: Oct 2003
Posts: 1,594
Likes: 0
From: CALGARY ab
Re: T V Cable fighting throttle - can't accelerate - help ! (Stingraynut)
LOOK careful at the pics of that link,, if your tv cable is close to rite it will look like those pics.
Now i have about 9/16" adjustment on one(87) and zero on the other(89)
Now i have about 9/16" adjustment on one(87) and zero on the other(89)
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Thread Starter
Burning Brakes
Joined: Dec 2002
Posts: 1,199
Likes: 4
From: Cairns Australia
Re: T V Cable fighting throttle - can't accelerate - help ! (korvette4u)
I'm planning to test a few things tomorrow morning after reading up here and everywhere as much as I can.
One thing I didn't mentioned is that the tranny is shifting fine, just like always, but you have to bang the throttle to break it free then although it's very stiff, it's possible to get some throttle - I drove for 30 mins like this then a 3 hr stop then 30 mins again. All shifts normal.
To prove it's the TV cable, can I unhook it and drive gently for a few minutes or will that break something ?
S'nut
One thing I didn't mentioned is that the tranny is shifting fine, just like always, but you have to bang the throttle to break it free then although it's very stiff, it's possible to get some throttle - I drove for 30 mins like this then a 3 hr stop then 30 mins again. All shifts normal.
To prove it's the TV cable, can I unhook it and drive gently for a few minutes or will that break something ?
S'nut
Burning Brakes
Joined: Jul 2003
Posts: 922
Likes: 1
From: Brisbane Queensland, Australia
Re: T V Cable fighting throttle - can't accelerate - help ! (Stingraynut)
Sounds TO ME like maybe what your whole problem is/was is a stuck throttle valve body(?) in the transmission. If this is the case it may be just a matter of removing it (Needs pan pulled off I think) and cleaning it up well...
Heres a copy of my posting last year - has worked magically for me:
After posting my question of correct TVS cable adjustment (For TH700 transmission) I went to see the specialist who rebuilt my box recently;
He says correct proceedure to adjust TVS cable to a reference point is thus;
1. disconnect TVS cable
2. Have someone keep accelorator pedal floored
3. reconnect cable
4. depress release button and pull outer cable as hard as possible back towards adjuster then release button
5. release accelorator then bring outter cable 1/8" back towards throttle body
At 75kph auto MUST kickdown to 2nd from 3rd
Heres a copy of my posting last year - has worked magically for me:
After posting my question of correct TVS cable adjustment (For TH700 transmission) I went to see the specialist who rebuilt my box recently;
He says correct proceedure to adjust TVS cable to a reference point is thus;
1. disconnect TVS cable
2. Have someone keep accelorator pedal floored
3. reconnect cable
4. depress release button and pull outer cable as hard as possible back towards adjuster then release button
5. release accelorator then bring outter cable 1/8" back towards throttle body
At 75kph auto MUST kickdown to 2nd from 3rd
Burning Brakes
Joined: Jul 2003
Posts: 922
Likes: 1
From: Brisbane Queensland, Australia
Re: T V Cable fighting throttle - can't accelerate - help ! (korvette4u)
PLEASE NOTE Your tranny guy is the only guy to properly set this up!!!
:iagree: Well, with the tranny guy setting it up. As for that link; it looks wonderful. It's also the way I set mine up and as S'nut said; two hrs later my 1-2 clutch was fried!! It changed far too early; was great as a hoon machine, but for only two hrs, I'll give it a miss in future
Burning Brakes
Joined: Jul 2003
Posts: 922
Likes: 1
From: Brisbane Queensland, Australia
Re: T V Cable fighting throttle - can't accelerate - help ! (Stingraynut)
I'll adjust the TV cable and see what happens. S'nut
If the TV IS stuck, adjusting the cable won't do diddly. :skep:
Thread Starter
Burning Brakes
Joined: Dec 2002
Posts: 1,199
Likes: 4
From: Cairns Australia
Re: T V Cable fighting throttle - can't accelerate - help ! (smacko)
Thanks smacko for your advice and support - most appreciated - remember last time when you advised me to get JOH engineering to 'engineer my Air Pump and the pulley fell off !!!!! (BTW - Damm you Smacko) - and yours fell off then mine fell off then yours fell off etc
Seriously though, I'm hoping it is the Tv and can be fixed , I'm going to ask the tranny people to take the valve body off and clean and inspect - apparently it's only about another 10 bolts. I hope that is what it is.
I'm very tempted to disconnect the TV and see if the throttle is smooth - just to guarantee it's the Tv - can I do this without harm ?
Anyone?
S'nut
Seriously though, I'm hoping it is the Tv and can be fixed , I'm going to ask the tranny people to take the valve body off and clean and inspect - apparently it's only about another 10 bolts. I hope that is what it is.
I'm very tempted to disconnect the TV and see if the throttle is smooth - just to guarantee it's the Tv - can I do this without harm ?
Anyone?
S'nut
Drifting
Joined: Nov 2001
Posts: 1,783
Likes: 2
From: Latham NY
Re: T V Cable fighting throttle - can't accelerate - help ! (Stingraynut)
I have read that it is bad to drive with the TV cable disconnected. Drop the pan and check the movement of the valve. It's easy to see and you'll know right away if it is stuck.
Burning Brakes
Joined: Jul 2003
Posts: 922
Likes: 1
From: Brisbane Queensland, Australia
Re: T V Cable fighting throttle - can't accelerate - help ! (Stingraynut)
I'm very tempted to disconnect the TV and see if the throttle is smooth - just to guarantee it's the Tv - can I do this without harm ?
S'nut
S'nut
Burning Brakes
Joined: Jul 2003
Posts: 922
Likes: 1
From: Brisbane Queensland, Australia
Re: T V Cable fighting throttle - can't accelerate - help ! (Bluevette85)
I have read that it is bad to drive with the TV cable disconnected. Drop the pan and check the movement of the valve. It's easy to see and you'll know right away if it is stuck.
Don't drive with it disconnected!
Will overheat box really quickly
Thread Starter
Burning Brakes
Joined: Dec 2002
Posts: 1,199
Likes: 4
From: Cairns Australia
Re: T V Cable fighting throttle - can't accelerate - help ! (smacko)
OK - PROBLEM DISCOVERED - and I'm feeling dumb. I have some other transmission problems weighing on me and I suppose I automatically suspected the tranny for this one too.
it wasn't the Tv cable holding the throttle back, it's a combination of the new cable not being very good and a worn Throttle body spindle, it's sloppy - I can turn the part by hand OK but the cable seems to bind and then come with a lurch - I'm off to buy some aerosol lithium grease to put on the spindle and in the cable. So now I find out that my old throttle cable was OK, even with the join.
Thanks for all the help, I'm learning heaps about the transmission - and looks like I'm about to learn more about the TBody - I'm wondering if the local engineering firm can insert a brass bush there, I'll have to find out what's the go.
S'nut
it wasn't the Tv cable holding the throttle back, it's a combination of the new cable not being very good and a worn Throttle body spindle, it's sloppy - I can turn the part by hand OK but the cable seems to bind and then come with a lurch - I'm off to buy some aerosol lithium grease to put on the spindle and in the cable. So now I find out that my old throttle cable was OK, even with the join.
Thanks for all the help, I'm learning heaps about the transmission - and looks like I'm about to learn more about the TBody - I'm wondering if the local engineering firm can insert a brass bush there, I'll have to find out what's the go.
S'nut
