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Low idle problem.
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TOPIC: Low idle problem.
#54993
Low idle problem. 6 Years, 3 Months ago Karma: 12
Ive been having an issue with my idle speed.

for the past couple of weeks When starting cold the car would idle at 2000rpm. then settle down at 1000ish rpm. When the car got warm it would idle steadily at 1500rpm.

Now the car is idling at 500rpm. Even from cold,it will briefly rise to 1100rpm then drop to 500rpm.

Other than this the car drives perfectly-there is no performance issues in either scenario-high or low idle.

When I disconnect the idle sensor the car runs a bit rough but idles steady at 900rpm.

I have cleaned the contacts with spray (no difference). I also tried to remove the sensor to get a better look but its a nightmare to get a screwdriver flush against the screws.

Im wondering if it is the sensor or the idle valve itself?


Any thoughts?
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Last Edit: 2013/02/28 16:14 By Mister Two.

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#54997
Re: Low idle problem. 6 Years, 3 Months ago Karma: 91
Is yours turbo?
have no clue, but is all pipes and hoses(whatever there visually) around throttle body ok?
maybe this link can help?
Idle problem
silverlux
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#55003
Re: Low idle problem. 6 Years, 3 Months ago Karma: 12
No its an na. Thanks for your help.already saw that site.
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#55007
Re: Low idle problem. 6 Years, 3 Months ago Karma: 4
I would think it would be a trottle position sensor mate or broken vacum pipe..
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#55010
Re: Low idle problem. 6 Years, 3 Months ago Karma: 12
Was just out in the car for about 30mins and it idled perfectly at about 900rpm.

I know that wont last though and itl act up at some point again.

my thoughts are the sensor which il replace anyway (they're only a tenner) but i think il take the idle control air valve off to give it a clean. apparently it can get stuck with gunk.

I assume I have to take the throttle body off to do this. Anyone got any pointers on how to remove the throttle body-is it just a case of disconnecting vacuum hoses and unbolting the unit?
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#55016
Re: Low idle problem. 6 Years, 3 Months ago Karma: 327
If its an electrical issue, I would look for error codes first.

Then:


I would suspect the throttle body, as you say some gunk can build up in the bits and pieces of it.

I would recommend trying this stuff Wurth Air intake cleaner first.

What you need to do is get the car running, then pop the brake servo hose out of the intake and spray that stuff in with the engine running. the engine might start kicking up a fuss so might be handy to have somebody around to give it a bit of throttle at the same time.

Hope that helps, the Wurth stuff is wurth waiting for if you can wait.
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#55019
Re: Low idle problem. 6 Years, 3 Months ago Karma: 12
slipsliderg wrote:
If its an electrical issue, I would look for error codes first.

Then:


I would suspect the throttle body, as you say some gunk can build up in the bits and pieces of it.

I would recommend trying this stuff Wurth Air intake cleaner first.

What you need to do is get the car running, then pop the brake servo hose out of the intake and spray that stuff in with the engine running. the engine might start kicking up a fuss so might be handy to have somebody around to give it a bit of throttle at the same time.

Hope that helps, the Wurth stuff is wurth waiting for if you can wait.


Thanks slip. Il give it a go. No error codes so the ecu isnt picking up any issues. hopefully this will do the trick.
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#55020
Re: Low idle problem. 6 Years, 3 Months ago Karma: 80
if you do decide to take off the throttlebody its just a matter of disconnect the pipes and bolt off but u will probraly need to replace the gasket just make one out of a bit of flat cardboard thats what i do works a charm oh their is a water pipe running underneath it aswell for some reason it connected to the throttle body just thought id let ya know dont want to airlock your coolant
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#55024
Re: Low idle problem. 6 Years, 3 Months ago Karma: 12
cozzy90 wrote:
if you do decide to take off the throttlebody its just a matter of disconnect the pipes and bolt off but u will probraly need to replace the gasket just make one out of a bit of flat cardboard thats what i do works a charm oh their is a water pipe running underneath it aswell for some reason it connected to the throttle body just thought id let ya know dont want to airlock your coolant

Thanks cozzy-how do i avoid airlock-do I have to disconnect the water pipe to get the throttle body off?
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#55025
Re: Low idle problem. 6 Years, 3 Months ago Karma: 80
i left it connected if u disconnect it air will get in the system i cleaned mine down replaced the gasket and took off the rocker cover with it connected its not a big deal
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#55038
Re: Low idle problem. 6 Years, 3 Months ago Karma: 91
Yup, when was changing bits on my 2 followed cozzys advice, did the same without disconnecting coolant pipes
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