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Author Topic: High idle and hunting  (Read 3245 times)

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GaryBC

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High idle and hunting
« on: 19 December 2011, 11:14:17 »
Late last night (1am, exterior temp 2.5 deg C below freezing) started ok but, after a minute or two, it started hunting between about 1,000 and 1,400 rpm. After setting off it settled down. All ok from then on - I just put it down to "one of those things"! However......

This morning (7am, similar ext temp) it did the same thing but this time it didn't settle down. High idle when in gear (it's an auto) and hunting when in neutral or park. It also holds the gear changes longer - almost as if the engine is still trying to warm up (like it isn't getting the correct engine temp data?). Makes driving on icy roads slightly more 'interesting' than I'd like!

I topped up the engine oil at the weekend. Could I have disturbed a sensor connection or vac line maybe? It was fine until last night - this one has come completely out of the blue!

Cheers,
Gaz
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freecall666

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Re: High idle and hunting
« Reply #1 on: 19 December 2011, 12:53:02 »
did you spill some oil in plug wells???
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GaryBC

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Re: High idle and hunting
« Reply #2 on: 19 December 2011, 13:06:17 »
Don't think so but will check.
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GaryBC

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Re: High idle and hunting
« Reply #3 on: 20 December 2011, 08:33:44 »
Two thirds of the way home last night (c10 miles) it suddenly righted itself, and it was fine this morning!
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fiend61

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Re: High idle and hunting
« Reply #4 on: 20 December 2011, 09:03:34 »
was ext temperature higher this morning when everything was ok ?
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GaryBC

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Re: High idle and hunting
« Reply #5 on: 20 December 2011, 09:45:49 »
Yes, it was. So I'm on the lookout for it happening again next time it's at or below freezing. Obviously I didn't disturb anything when I topped up the oil and I didn't spill any in the plug wells. So if it comes back I must have a dodgy sensor somewhere.

In which case, any ideas as to what sensor(s) could be likely candidates?
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fiend61

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Re: High idle and hunting
« Reply #6 on: 20 December 2011, 09:49:23 »
might not be sensor, it could be ht related something breaking down due to coldness  :-\
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fiend61

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Re: High idle and hunting
« Reply #7 on: 20 December 2011, 09:50:10 »
what engine is it ?
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feeutfo

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Re: High idle and hunting
« Reply #8 on: 20 December 2011, 09:51:22 »
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GaryBC

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Re: High idle and hunting
« Reply #9 on: 20 December 2011, 09:58:32 »
Quote from: fiend61 on 20 December 2011, 09:50:10
what engine is it ?

If it was that then surely the problem would go away once the engine gets hot?
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GaryBC

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Re: High idle and hunting
« Reply #10 on: 20 December 2011, 09:58:54 »
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05omegav6

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Re: High idle and hunting
« Reply #11 on: 20 December 2011, 09:59:06 »
Temp sensor behind bumper on the blink :-\
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GaryBC

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Re: High idle and hunting
« Reply #12 on: 20 December 2011, 10:02:37 »
The indicated outside temp display on the dash seems ok - does the engine management computer take a feed from there too?

Where is it? If it's easy to get at I can re-seat the connector.
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05omegav6

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Re: High idle and hunting
« Reply #13 on: 20 December 2011, 10:18:42 »
It sits behind the front bumper below the washer bottle :y

Not sure about PFL, but Facelift access is easy enough with bonnet open :y
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albitz

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Re: High idle and hunting
« Reply #14 on: 20 December 2011, 10:27:28 »
Quote from: GaryBC on 20 December 2011, 10:02:37
The indicated outside temp display on the dash seems ok - does the engine management computer take a feed from there too?

Where is it? If it's easy to get at I can re-seat the connector.

No. ;)
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