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Old 4 Days Ago   #1
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idel speed fluctations

had a issue this morning after setting off drove short way to main road and stopped to get out and the idel speed was changing between 800 and 1000 ish while sat there out of gear engine was still quite cold but warm enough that it had dropped from "warm up speed"


any idea what the issue was?
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Old 3 Days Ago   #2
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Re: idel speed fluctations

any ideas its done this again today really annoying
sound like its running perfectly fine just like somebody is reving it a small ammount?
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Old 3 Days Ago   #3
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Re: idel speed fluctations

Hi Cal

To help you get a bit of useful help it would be helpful to advise what age and engine/fuel type you have. the mileage and some history of the care the car has had will be useful too.

Tim
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Old 2 Days Ago   #4
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Re: idel speed fluctations

He has the 1.4 16v same as me if my memory is correct
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Old 2 Days Ago   #5
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Re: idel speed fluctations

as above its a 1.4 16v with 39k miles
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Old 2 Days Ago   #6
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Re: idel speed fluctations

Once its warmed up, it's back to normal?
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Old 2 Days Ago   #7
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Re: idel speed fluctations

Quote Originally Posted by barnettgs View Post
Once its warmed up, it's back to normal?
yeah it runs fine once warmed up

the issues only seems to show when fairly cold
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Old 2 Days Ago   #8
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Quote Originally Posted by Cal2412 View Post
yeah it runs fine once warmed up

the issues only seems to show when fairly cold
I think its normal for engines to do that when it's cold.

It doesn't affect when driving from cold, is it?
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Old 2 Days Ago   #9
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Re: idel speed fluctations

Quote Originally Posted by barnettgs View Post
I think its normal for engines to do that when it's cold.

It doesn't affect when driving from cold, is it?
normal? since when is normal for the idel speed to alter around 100rmp every 2-3 secsonds its never done that until reacently and never haerd of any other car doing it
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Old 2 Days Ago   #10
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Re: idel speed fluctations

I had same issue. Dealer just replaced sparkplugs and its gone.
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Old 2 Days Ago   #11
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Re: idel speed fluctations

Quote Originally Posted by Obo67 View Post
I had same issue. Dealer just replaced sparkplugs and its gone.
sholdnt be spark plugs fitted irridum plugs and they have only done 3k or so
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Old 1 Day Ago   #12
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Quote Originally Posted by Cal2412 View Post
sholdnt be spark plugs fitted irridum plugs and they have only done 3k or so
I suppose spark plugs are the only one that were changed recently? It could be that they behaved a bit differently when cold? Brand name?

Not all spark plugs are same but someone with more knowledge can help you.

Idle normally goes up to around 1000 rpms or so, when starting cold regardless of which car.

By the way, it can be a concern if it is idling roughly.
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Last edited by barnettgs; 1 Day Ago at 10:43.
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Old 1 Day Ago   #13
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Re: idel speed fluctations

Quote Originally Posted by barnettgs View Post
I suppose spark plugs are the only one that were changed recently? It could be that they behaved a bit differently when cold? Brand name?

Not all spark plugs are same but someone with more knowledge can help you.

Idle normally goes up to around 1000 rpms or so, when starting cold regardless of which car.

By the way, it can be a concern if it is idling roughly.
ngk 6046- DCPR7EIX plugs were fitted

and im not talking about the increased speed at warm up
the idel speed it contstantly changing eg 900 one sceond then up to 1000 then back to 900 a sec later allmost like the throttle is being pressed a small ammount
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Old 1 Day Ago   #14
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Re: idel speed fluctations

Dismantle and clean the throttle valve.
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Old 1 Day Ago   #15
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Re: idel speed fluctations

it looked fairly clean but given it clean through with carb cleaner and a wipe out at reach what i could get to
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