hard deceleration
Thread Starter
Intermediate
Joined: Dec 2006
Posts: 49
Likes: 0
From: Newtown PA
hard deceleration
I have a 1986 Z51 automatic coupe that runs excellent except for one thing. When cruising on level ground and removing my foot from the accelerator, the car feels like it downshifts hard into a lower gear, almost like as if I were downshifting with a manual shift. When I put my foot back on the gas and push it feels like it upshifts hard into a higher gear. This only happens intermittently, sometimes in the same situation the car will smoothly decelerate to the lower gear then smoothly upshift upon acceleration as I feel it should. I have been told that my problem is the IAC. I had my current IAC replaced a short time ago and the IAC descriptions I've read here don't seem to apply. Has anyone else had this type of problem?
Racer
Joined: Oct 2012
Posts: 350
Likes: 2
From: Huntsville AL
I have a 1986 Z51 automatic coupe that runs excellent except for one thing. When cruising on level ground and removing my foot from the accelerator, the car feels like it downshifts hard into a lower gear, almost like as if I were downshifting with a manual shift. When I put my foot back on the gas and push it feels like it upshifts hard into a higher gear. This only happens intermittently, sometimes in the same situation the car will smoothly decelerate to the lower gear then smoothly upshift upon acceleration as I feel it should. I have been told that my problem is the IAC. I had my current IAC replaced a short time ago and the IAC descriptions I've read here don't seem to apply. Has anyone else had this type of problem?
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,062
From: altered state
St. Jude Donor '05
Drivers side near the front of the intake. Think its the lower of the two cables if I recall. There is a process to it someone can post surely. Cant remember myself lol
