What it does is prevent a 1-2 shift under a very narrow (but frequently touched) set of conditions - engine at temp, speed in certain range, throttle less than some %. Details are in the manual. The "benefit" is that it helped GM get better efficiency in EPA testing & avoided the gas-guzzler tax for the M6, IIRC.
I believe that this feature is known as "computer aided gear selection" or "CAGS" for short. a buddy of mine has a z06 and it is the first thing he changed with a solonoid block-off. does anybody know where to find this for a GTO or will one for a vette work?
In practice, this has become less of a nuisance than it used to be with my 96 TransAm. The speed window is narrower, and they have built in some other computer-recognized conditions that prevent you from catching 4th when you need a bit less lug in normal driving conditions.
Having said that, there are a few things you can do to eliminate it altogether without the expense of screwing with the transmission.
1) If you're not in a hurry, shift early out of 1st and 2nd will be there. I do this on a normal, flat take off in city traffic.
2) If you are pushing it just a bit (normal driving), wait for the shift light to go out before upshifting to 2nd
3) You can always eliminate the CAGS by a quick double clutch
4) You can avoid the CAGS resetting by not coming to a COMPLETE stop.
In my normal daily drive, I never engage CAGS with one exception: when turning a corner and heading up a hill, I sometimes forget the speed window and catch 4th. I've since modified my habits and hold 1st until I get straightened out and rev past the shift light.
'05 GTO Impulse Blue / Blue leather M6 (9,000 miles)
'01 GTP Midnight Blue A4 (120,000 miles)
'96 TransAm M6 (150,000 miles)
'93 GrandAm GT Quad4 H.O. M5 (210,000 miles)
'89 Olds Calais International Quad4 H.O. M5 (165,000 miles)
'82 Buick Skyhawk M4 (100,000 miles)
'75 Saab 95EMS M4 (120,000 miles)
'70 Plymouth GTX A3 (110,000 miles)
'67 Mustang A3 (220,000 miles) - wife's car
This is my first experience with CAGS, and as a newb I've actually found it somewhat helpful. So far, it has been a handy tool to keep me from running up someone's backside in traffic or lagging too far behind when accelerating from a stop. Having said that, I should also mention that I've more than doubled my HP & tripled the torque from my last vehicle so major adjustments to my driving habits have been in order. I've also found that following the shift points described in the manual eliminates it also, but its not nearly as fun.
I installed a skip shift eliminator yesterday from SLP performance since in traffic i kept hitting the 1-->4 shift thing and just would throw me off but so far no problems easy to install and havent had the skip shift thus far.
2005 6 speed GTO Phantom Black Red interior
1970 4 speed 442 Azure Blue
if the manual said engine temp higher then 196f then would the 160f thermostat fix the skip shift problem?
No. A 160 F thermostat simply opens at a lower temperature. During driving, the engine temperature is expected to be higher than 160 F.
As far as CAGS removal is concerned, if you plan on getting the car tuned in the future (highly recommended), I would have the tuner turn CAGS off. This would be in lieu of purchasing the hardware for $20-$30.
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