Cold start driveability question
#1
Cold start driveability question
What is the stock 2001 LS ecu doing in this condition, and how can I fix it?
Driving after a cold start until the car warms up a bit, I get hesitation and bucking between 2,000rpm and 3,500rpm and in part throttle. If I give more than ~50% throttle, or go past 3,500rpm at any throttle position, normal acceleration occurs.
Other info
-This happened even when the car was 100% stock, and had no CEL.
-This does not happen after the oem temp gauge reaches around halfway to vertical position.
-This does not happen if cold starting in 50*F or hotter weather.
-This also did not happen at all while using an MS3basic unit.
Driving after a cold start until the car warms up a bit, I get hesitation and bucking between 2,000rpm and 3,500rpm and in part throttle. If I give more than ~50% throttle, or go past 3,500rpm at any throttle position, normal acceleration occurs.
Other info
-This happened even when the car was 100% stock, and had no CEL.
-This does not happen after the oem temp gauge reaches around halfway to vertical position.
-This does not happen if cold starting in 50*F or hotter weather.
-This also did not happen at all while using an MS3basic unit.
#5
On further reflection, I'm fairly certain it has to do with the VTCS operation. I spent a long time messing around with it, even unplugged the VTCS solenoid, but that didn't fix it (made it worse actually). It was literally exactly what you describe, though, down to not happening above 50 degrees ambient. It went away after changing the battery, and was gone for over a year before I went to MS3.
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