AeroRamer
Active Member
- Joined
- July 17, 2008
- Messages
- 89
- Reaction score
- 4
- City, State
- Jax, FL
- Year, Model & Trim Level
- '00 Limited
Erratic/Cyclic RPM idle and Overheating problem
About a week ago I started noticing the Ex idling erratically, with the RPM’s going back and forth or cycling between normal idle of about 600 RPM to about 1200 RPM every 3 to 6 seconds, sometimes a few more seconds longer in between.
This appears to happen only when the truck is in gear and I am stopped. I have not noticed this while the Ex is in neutral or parking, or when coasting. It appears to happen only in first gear. My Ex is auto.
One interesting thing I noticed this morning when I was parking the Ex is that the jump and cycling of RPM’s is happening right after the temperature indicator needle starts moving noticeably fast to the hot range. At that time, the RPM’s jump and the temp needle immediately moves back to what it was before. It is like the engine is sensing a higher temp and increase the RPM’s trying to cool the engine. For comparison, it behaves similar to turning the A/C on and the compressor cycles from on and off and the engine RPM adjusts to it.
I have yet to check for any codes as I just noticed this last week but I wanted to check with you all and see what you think. Any comments on this issue?
About a week ago I started noticing the Ex idling erratically, with the RPM’s going back and forth or cycling between normal idle of about 600 RPM to about 1200 RPM every 3 to 6 seconds, sometimes a few more seconds longer in between.
This appears to happen only when the truck is in gear and I am stopped. I have not noticed this while the Ex is in neutral or parking, or when coasting. It appears to happen only in first gear. My Ex is auto.
One interesting thing I noticed this morning when I was parking the Ex is that the jump and cycling of RPM’s is happening right after the temperature indicator needle starts moving noticeably fast to the hot range. At that time, the RPM’s jump and the temp needle immediately moves back to what it was before. It is like the engine is sensing a higher temp and increase the RPM’s trying to cool the engine. For comparison, it behaves similar to turning the A/C on and the compressor cycles from on and off and the engine RPM adjusts to it.
I have yet to check for any codes as I just noticed this last week but I wanted to check with you all and see what you think. Any comments on this issue?