Hi-
After a cold start, I am having an issue with RPMs "bouncing" up and down rapidly. The bouncing is so severe it causes the truck to buck really hard forward and back - you would definitely notice it if you were following in another vehicle. It happens every cold start and occurs after about the first 1/8th of a mile. The Toyota dealership said they looked at the computer and didn't see any issues. Any thoughts? Any ideas or suggestions would be MUCH appreciated.
Here is some additional info in case it helps:
After a cold start, I am having an issue with RPMs "bouncing" up and down rapidly. The bouncing is so severe it causes the truck to buck really hard forward and back - you would definitely notice it if you were following in another vehicle. It happens every cold start and occurs after about the first 1/8th of a mile. The Toyota dealership said they looked at the computer and didn't see any issues. Any thoughts? Any ideas or suggestions would be MUCH appreciated.
Here is some additional info in case it helps:
- It is a 2008 LC with 130,000 miles. I have had the LC for two months and its just been happening the past month.
- Typical RPM range when the bouncing occurs is 2,500 to 3,000 with the tachometer jumping quickly up and down by roughly 500 RPMs.
- It lasts for about 10 seconds and then does not re-occur again until a completely cold start (i.e., overnight).
- If I let off the gas, and wait a few seconds before applying the gas again it usually stops.
- A week before this started happening, I had part of the 120K service completed:
- Oil Change
- Transmission fluid change
- New Spark plugs
- New Serpentine belt
- It has occurred at all outside temps over the past month (45 – 80 deg) – located in southeast US
- Again, it is is not a minor revving up and down, it is severe with the entire vehicle lurching front and back.