- Messages
- 468
Morning all, after some suggestions for low idle speed.
Car starts up fine, idles fine when cold and sits quite happily at 1000rpm. However, once up to operating temperature she sits at about 500rpm, pretty steady speed, no hunting. Car obviously struggling with dim lights and engine shaking like a pig.
It's been like this for a while, but when it's really hot out, like last few days, it's prone to stalling when coming to a stop in traffic. Usually only when on slow approaches, so up to traffic lights or roundabouts in town at 30/40mph. In particular the other day it stalled twice on me and wouldn't hold the idle, had to keep the throttle open until I was driving again. MOT guys mentioned it was bad and stalled it a good few times getting it on and off their ramps.
There's plenty of threads about which describe fast or erratic/hunting idles, mostly blaming vacuum leaks or the IACV. I'm curious whether a low idle could just be dirt in the valve, or if there are other causes? I can't find much that specifically points at low problem.
I'm not so sure it is just the valve, because when engine is cold it's cold outside it is pulling in the extra air to raise the idle speed up to 1k. But I've never dealt with an IACV before, so I'm probably wrong.
I've tried the idle learn, kept at 3k until hot, and she settled back down at about 1k afterwards and didn't move. Ran it for 5 mins then went for a drive, first traffic light pulled to a stop and dropped straight back down to 500rpm.
Thoughts?
Edit: CEL is not on, and does work.
Sent from my iPhone using Tapatalk
Car starts up fine, idles fine when cold and sits quite happily at 1000rpm. However, once up to operating temperature she sits at about 500rpm, pretty steady speed, no hunting. Car obviously struggling with dim lights and engine shaking like a pig.
It's been like this for a while, but when it's really hot out, like last few days, it's prone to stalling when coming to a stop in traffic. Usually only when on slow approaches, so up to traffic lights or roundabouts in town at 30/40mph. In particular the other day it stalled twice on me and wouldn't hold the idle, had to keep the throttle open until I was driving again. MOT guys mentioned it was bad and stalled it a good few times getting it on and off their ramps.
There's plenty of threads about which describe fast or erratic/hunting idles, mostly blaming vacuum leaks or the IACV. I'm curious whether a low idle could just be dirt in the valve, or if there are other causes? I can't find much that specifically points at low problem.
I'm not so sure it is just the valve, because when engine is cold it's cold outside it is pulling in the extra air to raise the idle speed up to 1k. But I've never dealt with an IACV before, so I'm probably wrong.
I've tried the idle learn, kept at 3k until hot, and she settled back down at about 1k afterwards and didn't move. Ran it for 5 mins then went for a drive, first traffic light pulled to a stop and dropped straight back down to 500rpm.
Thoughts?
Edit: CEL is not on, and does work.
Sent from my iPhone using Tapatalk
Last edited by a moderator:
