Skip Shift Elimination!
The following is THE way IMO to eliminate the Skip Shift "feature" on 94 and 95 F-Bodies. Unfortunately, this method only works on 94 and 95 models which are the OBD-I type. This will throw an SES light if done on an OBD-II F-Body; the 96+. It is very "clean," simple, and doesn't involve resistors that can burn up or fall out. I have done this on my 95 Trans Am and 96 SS without problems. (The 96 has a 94 PCM... that's why it works on *this* particular 96 :)
The actual method to do this is taken from the FAQ at www.f-body.org but I have added pictures for easier reference.There is a lot of other excellent information in the FAQ and it's definitely worth checking out!
First, a little history behind CAGS.Q: What's CAGS (skip shift) and how does it work? A: CAGS stands for Computer Assisted Gear Selection and is on 1994 and on cars with 6 speed transmissions. It's purpose is to improve gas mileage and avoid the "gas-guzzler" new car tax. CAGS comes into play under the following conditions:
This will energize the skip-shift solenoid and force a 1st to 4th shift. What happens is you'll be moving happily along when suddenly the "Skip Shift" light goes on in the dash. At this point you will be locked out of 2nd and 3rd. You simply cannot shift into them. At this point several options are available to you:
Interestingly, 1st gear is determined by the PCM calculating from the speed sensor input and the RPM values. Disconnecting the solenoid connector disables CAGS but an error code 84 WILL be set if the PCM does not measure voltage at the solenoid connection to the computer for a period of 26 sec. This code is stored but will NOT light the Service Engine light. Apparently Chevy correctly anticipated the rush for owners to disable this function. A resistor inserted in the connector will allow voltage to the PCM input and prevent this code setting but who cares since the code is reference only.
Disabling CAGS and the Skip Shift Light
The following procedure requires a 10mm socket, extension, ratchet, and awl (or similar tool with a pointed tip):
Remove the two bolts holding the PCM to the inner
fenderwell. (The PCM is the cigar box sized unit located near the passenger side hood
Even though the procedure looks complicated and intimidating, it should only take about 15 minutes to complete. This will cause error code 91 to be set and stored in the PCM in addition to code 84 set by removing the solenoid. This is only detectable by use of a scan tool. The above codes do not cause the service engine light to illuminate.