It does not seem to bang. As soon as you shift it into drive (or reverse) it just makes a jerk and instantly kills. I guess it feels similar to letting the clutch out in gear on a manual transmission when it makes the jerk.
It is not an issue any other time of the day. Stop and go traffic is fine, and when you come to a stop sign it is fine. The only time it will do it is first thing in the morning, you can leave it sit the rest of the day and start it that afternoon/night and it starts and goes into gear just fine.
When you start it in the morning it idles a little higher (about 1,300 rpm) for the first minute or so and then drops down to normal idle (about 900-1,000). If you wait to put it into gear until that happens, nine times out of ten the engine will not shut off. That is what made me think it was a sensor issue of some sort. I took the IAC sensor off again to re-clean it. It does not look like the plunger closes fully. Not sure if it is even supposed to close tightly or if the spring in there is weak causing the small air gap and allowing the air to force past it. I will get a new IAC sensor and try it.
I was reading about possible torque converter issues on the internet so I drained and refilled the transmission a few times but it did not help. The fluid was dirty but not burnt. I did not do a flush because of the miles on the transmission.
Monday, February 20th, 2017 AT 2:21 PM