I have not yet resolved the issue. Here is what I've done since I last updated. Knowing the the engine coolant temperature effected the way the car shifted I troubleshot that area. I purchased a potentiometer that could get down the the range of resistance that the CTS operated in. I found that the CTS was around 200 ohms when car was at operating temperature and that resistance decreased and temperature increased. So I attached the potentiometer to the connector for the CTS and changed the resistance the ECM was receiving to 150 ohms. Wa-Lah! That fixed the problem! Shifted great every time no problems ever. So I figured the CTS was bad. I replaced it and it didn't fix it and I found that the CTSs are not designed to go down to 150 ohms at operating temperature. So I started to lean towards the ECM or shift solenoids again. I stumbled across another used ECM with 215k miles on it and that didn't fix it, so I swaped the AB shift solenoid pack out for another used set, and that didn't make any difference also. Another thing, I've got the other car that is doing the same thing running, the one I converted to V-TEC with non-V-TEC transmission, and it continues to also flare from 2nd to 3rd once warmed up. So I'm still searching and I'm almost positive that it's not an issue internal to the transmission. By the way, what is the purpose and what does the linear shift solenoid do on these cars?
Friday, January 27th, 2012 AT 1:48 PM