My truck has developed a new twist. When it cold starts it rolls very slightly ahead, even while it is in park. My foot is off the brake.
Any clues here?
Any clues here?
Lurch at startup?
- Thread starter smokey262
- Start date
This is a known issue as the fluid is sitting in the clutch packs and causes that clutch pack to lockup and make the truck jump as if you shifted into gear and back out within a second. No harm done by this at all. To be safe you can engage your parking brake so as to prevent stress on your parking pawl when it bucks forward when the truck is started cold.
Wooluf1952
Member
IIRC, there have been other members asking about the same thing. The consensus was, not a problem. But others will add more.
littleblazer
Member
- Jul 6, 2014
- 9,268
It only seems to happen to me when it is quite cold outside and it is the first start of the day or a cold start. And by cold I mean below 40 degrees, which isn't that cold...
Same here dude. I get it most when its cold. Only time I ever had it happen before when it was cold was when I parked on a slight incline and forgot to engage the parking brake first then put it in park. It did that slight bucking motion when starting it but did no harm. Don't worry about it. There is nothing wrong with it being like that. 
edit: I would still say put your parking brake on especially during the colder months so as to avoid jarring the parking pawl. Last thing you need to have happen is to snap that thing or ruin something in the tranny from it grabbing when it has the torque on a cold startup like that.
edit: I would still say put your parking brake on especially during the colder months so as to avoid jarring the parking pawl. Last thing you need to have happen is to snap that thing or ruin something in the tranny from it grabbing when it has the torque on a cold startup like that.
BlazingTrails
Member
- Apr 27, 2014
- 19,409
When it's cold, the initial idle RPM is set to 1200, not the normal 600. May also be a side effect of this.
Envoy_04
Member
- Jul 1, 2013
- 749
Only thing I would add is that when it is extremely cold you might want to avoid the parking brake. If you've ever had to crawl under to unstick a frozen one, you'll understand why, it's no bueno.
Thanks guys. Now that the weather has climbed back into the mid-twenties to thirties the problem has stopped. The weather wont be this nice for long though. I think I will try to start it with my foot on the brake when it gets cold again