Read this one also.

http://forums.corvetteforum.com/show...throttle+cable

 

Rick--that link sounds like the best and most complete description yet of what is happening with this adjustment. So when you "pull" the cable out all the way, the final "correct" position is automatically set by opening the throttle all the way (via some ratcheting mechanism that resets the cable to its proper position). I guess the only difference between the 94 and 95/96 cable is that the lever that locks the cable has been replaced by the button that we have--otherwise no difference.

Doug

 

Well, I was playing around with this adjustment on my 95 auto and, based on what I saw along with looking at the FSM, certain things now make sense. When I first tried adjusting (by pushing button, pulling cable out towards windshield, pushing accelerator to floor) I found that the throttle would not entirely close (the throttle bracket did not come back all the way to the idle stop). It turns out the cable to the cruise control is what kept the throttle body from closing back to idle all the way. Then I re-read the FSM and things started making sense. The cable adjustment to the throttle body must be made while the cable to the cruise control is UNCONNECTED. After the cable to the throttle body is adjusted, then the cable to the cruise control is reconnected. In fact according to the FSM, both these adjustments need to be made together.

Also, according to the FSM, the adjustment to the throttle cable is NOT made by pulling the cable all the way out. Rather, the throttle must be at its idle stop and then you pull the cable out just enough (while pushing the button) to take up the slack but not so much that the throttle position comes off idle stop. When this is done correctly, the throttle will open to 100% when the pedal is floored. If not, the problem is not with the cable but with something else since apparently the length of the cable (when the slack is removed) and the travel of the pedal is predetermined to open the throttle blades to 100%. After the throttle cable is adjusted, then you need to reconnect the cruise control cable to one of the holes on the servo such that it does not pull the throttle open--there are at least 5 holes on the servo so one of these should work.

Doug

 

This isnt a mod, its a maintainence item.

 

True but not an item that is explained very well in the FSM. In fact much of the writing in the FSM is not well written and sometimes does not even apply (e.g., illustrations or descriptions that apply to the wrong model year).

 

Yeah, and I'm finding that to be quite irritating... that was the reason I spent > $100 on the FSM, so it would be correct.

Seems like the knowledge here on the forum is better... and FREE.

 

I think it would be a good idea not to do any further work on your vehicles til you understand the information presented to you in the GM service manual.

 

I've barely used the FSM since I bought it. I usually use it as a last option. The info and illustrations are not always up to date.

 

Yeah--I guess anyone who has ever tinkered with a car without religiously following and understanding (or even having) the manual should walk away in the sunset in shame with their head down.

 

Read pages 5E2-137 through to 5E2-139 (for all those with a 94 FSM) If you have trouble understanding that, you should not be touching it. Its very straight forward.

 

I'm not sure what the 94 manual shows. The 1995 FSM I have shows illustrations and procedures, for certain reapirs, for a 1994 corvette which appear to be completely different then the 95 model. For example the throttle adjustment does not appear to be the same for a 94 and 95 but the 95 FSM shows the 94 procedure and pictures.

 

There is 2 different setups on a 94, there is early and there is late. The 95s ive seen had the same setup (or very simular) to the late 94s.

 

Figure 25 in my 1995 FSM says 5-26-94 as the date of the illustration and accompanying procedure. It must be the early cable adjustment that they are describing and showing. I have seen this in other reapairs thoughout the manual also. I think mine has been fixed for some time now anyway. I won't know for sure until I hook it up to the laptop. It would be nice to have had the exact procedure. I wonder if GM sends updates to the factory to update the FSM during the year.

Can someone with a 96 FSM check the procedure? I'm curious to see if it's the same as the 95.

 

If it says 26th of May, 1994, that is most certainly a very late 94, which as i said, were the same as the 95s ive seen. An early 94 would be July of 1993.

Figure 25 on page 5E2-136 in the 94 manual i have here is the cable routing diagram. It has no dates, but says MS 13637-5E1 in the bottom right hand corner of the picture.

Figures 26 and 27 have MS 11623-5E2 and MS 11624-5E1.

 

Basically, I believe that the basic description procedure describe in my (and Rick's) 95 FSM is correct (although written in a slightly confusing manner) but the main difference is in the mechanism that "locks" the cable. The 94 had some kind of latch while the 95 had the button. Otherwise no significant differences.

 

From the 1995 Red Factory Service Manual Book 1.....

"1. Unlock throttle body cable adjuster by pulling up locking tab (Figure 25).
2. Disconnect cruise control cable from cruise control servo.
3. Hold throttle body lever at stop/idle position.
4. Lock throttle body cable adjuster by pushing tab down.
5. Check that throttle body lever returns fully to the stop/idle position.
-Using a Tech 1 with a mass storage cartridge, check throttle angle percentage by depressing the accelerator pedal. When the accelerator pedal is fully depressed, throttle opening should be 100%. When the accelerator pedal is released, throttle opening should return to 0%. If proper results are not obtained, check cables for kinks or damage and repeat procedure.
6. Adjust cruise control cable. Refer to "Cruise Control Servo Linkage Adjustment" in this section."


Change this phrase to button and it works? Since the button doesn't lock and unlock, how does that work?

 

The button takes the place of locking the cable in place. Pushing the button unlocks the cable (and allows it to slide) and releasing the button locks it. So the button just takes the place of the latch/lock that was used on the previous model.

 

I see what youre saying here now, mine is the same as in that pic. And its a 94. Id also like see what is on the 96s as Rick asked, ive never taken enough notice.

Apart from that is everything else in the procedure easy to follow?

 

Pretty much although what was confusing was the order presented in the manual of adjusting one cable (throttle) then the other (cruise control). It seems like these have to be adjusted together as they seem to be interconnected and moving one will affect the other.

 

The pedal cable must be done first with the cruise servo cable unhooked, then when the pedal cable is done, you can connect the cruise servo. If you have the pedal cable set correctly, then you set the cruise cable to suit. The cruise servo doesnt have to pull to WOT (and wont even go close anyway), but it does have to allow the blades to fully close with no resistance.

What does it say before that in your 95 book about setting the ASR unit?