My friend has a 1993. Pretty standard engine area except for the Holley Throttle Body. When inside the cockpit pushing on the throttle pedal, the shaft and fittings on the side of the TB only look like they're rotating about 70-75 degrees. If you then try and rotate the TB with your fingers, you get another 15 or 20 degrees out of it.

First observation, when everything is back at idle, there is slight play in the cable leading to the TB.

We pulled both covers off the ASR box. Is that just cruise control or does that mean he has some sort of traction control? I'm not that familiar w/ C4's. Second observation is that when you look at the combination of pulleys and cables in the ASR box, and watch closely when the throttle is slowly depressed, when the cable from the pedal rotates it's pulley, the cable and pulley going to the TB also rotate, EXCEPT for the last 15-20 degrees. At that last 15-20 degrees, the cable and pulley connected to the pedal continue to move, but the cable and pulley that deal w/ the TB do not move any further.

Is this a defect w/ the ASR box? If so, what's the easiest way to fix this. Is this something a mechanically skilled person can do or is it best left to dealer or third party mechanic???

Anyone else have similar problems?

Save the wave.

Thanks in advance,


Don

 

This problem has been discussed a few times. Do a search and you’ll find that if you take the TB lever from your old TB and swap it with your new one, then it will work. The lobe of the lever is different, that’s the reason it won’t work.
Had the same problem with mine and fixed it that way.

Arnold

 

There is a procedure for adjusting the throttle cable through all of the linkage, but if you're like me, it still won't work. Being that Holley is just right up the street, I just took it to them. They stared at it for a while and ran through the whole adjustment procedure and it didn't help. They finally took the throttle body off and adjusted the spring. If you look closely the coil spring has three different places where it can engage in the side of the throttle body. Mine was set to the tightest setting, they adjusted it to the lightest setting and it works like a charm.

Apparently the tight setting works fine for an F-body that doesn't have all of the extra monkey motion of the ASR system. Toss in the ASR and you've got to adjust it.

 

Holley actually had two styles of linkage connection. The early Vettes and F-bodies used one style while the late models used a different style. If you got the proper TB from Holley, their linkage does work. The problem is that you have to know what you're looking for to realize that it's different and causes a problem. Because I knew the people at Holley I was aware enough to get the proper one. Most people don't distinguish, they just say "LT1."

 

Can you post a pic of this? I wonder if AS&M has same issue.

 

It's not the ASR, it's the nature of the Holley. I haven't done it yet, but if you notice where the TB stops, you can cut a little notch so it will open all the way. Somebody else on the forum has done it and has pics.

 

Nathon I have done this and it still didn't work!! I even drilled a fourth hole to lessen the spring pressure even more and it didn't work. Maybe I just got one of those LT1 TB that don't fit for the LT1 Corvette.

Arnold