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Author What can cause lumpy idle
FruitBooTeR
Member

Registered: 18th Jan 07
Location: Wolverhampton Drives: S15
User status: Offline
16th Mar 09 at 19:16   View User's Profile U2U Member Reply With Quote

Car drives fine really but seems to idle a bit rough.

Now there is NO EML ON so im guessing all the sensors are ok but it seems to idle a bit lower than normal say about 700 / 800rpm and sometimes it moves up and down (nothing major like but if you look really close you can see the needle jumps up and down a few millimeters now and again)

So basicly no eml does that mean no sensors are gone?

It had new plugs and leads 2 weeks ago too and an oil and filter change.

EDIT its an x16xe corsa sport btw

[Edited on 16-03-2009 by FruitBooTeR]
john_c20xe
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Registered: 10th Feb 08
Location: Eastbourne, EastSussex
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16th Mar 09 at 20:31   View User's Profile U2U Member Reply With Quote

check for air leaks!
use break cleaner is easyist way!
FruitBooTeR
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Registered: 18th Jan 07
Location: Wolverhampton Drives: S15
User status: Offline
16th Mar 09 at 21:29   View User's Profile U2U Member Reply With Quote

How do you do that mate?

john_c20xe
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Registered: 10th Feb 08
Location: Eastbourne, EastSussex
User status: Offline
16th Mar 09 at 22:50   View User's Profile U2U Member Reply With Quote

spray break cleaner around the inlet, throttel body ect the engine will start to rev high as it drawing in the flamable substance
Gareth F
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Registered: 16th Jan 08
Location: Location Location
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17th Mar 09 at 00:22   View User's Profile U2U Member Reply With Quote

Ive had the same problem, needle hardly moves on the rev counter but you can feel the little jolts. Have had it with both x16xe engines ive had as soon as i put an exhaust on them
Ive just got used to it now........
Air leaks usually caused eratic idling and sometimes stalling doesnt it?
fazza
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Registered: 7th Feb 08
Location: Plymouth
User status: Offline
17th Mar 09 at 00:41   View User's Profile U2U Member Reply With Quote

throttle position sensor on the side of the tb mate.

had it on my last 2 gsi's
FruitBooTeR
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Registered: 18th Jan 07
Location: Wolverhampton Drives: S15
User status: Offline
17th Mar 09 at 09:28   View User's Profile U2U Member Reply With Quote

Cheers guys
1.0l12vbadboy
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Registered: 17th Nov 03
Location: Keighley, West Yorkshire
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17th Mar 09 at 09:33   View User's Profile U2U Member Reply With Quote

Idle Speed control valave. Fault code: P0505. i think


Just because the EML is not on does not mean al lthe sensors are ok.

Try unplug the Idle Speed control valave while car is running see if it drops in revs.



[Edited on 17-03-2009 by 1.0l12vbadboy]
FruitBooTeR
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Registered: 18th Jan 07
Location: Wolverhampton Drives: S15
User status: Offline
17th Mar 09 at 09:55   View User's Profile U2U Member Reply With Quote

Wheres that located mate?

Edit - and surly if you unplug it it will drop in revs?

[Edited on 17-03-2009 by FruitBooTeR]
1.0l12vbadboy
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Registered: 17th Nov 03
Location: Keighley, West Yorkshire
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17th Mar 09 at 10:00   View User's Profile U2U Member Reply With Quote

Yeh if it drops makes a diffrance then you know its not that i.e its working properly. if its not working it wont make a dif.

Process of ilimination.

They are located in dif places on dif cars. what you drivein?

Its usually around the inlet. google it.
FruitBooTeR
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Registered: 18th Jan 07
Location: Wolverhampton Drives: S15
User status: Offline
17th Mar 09 at 10:09   View User's Profile U2U Member Reply With Quote

Ive got a split /crack in the exhaust somewhere in the middle section think its at the back of the middle box as you can hear it blowing on idle.

That wouldnt affect the idle would it?
1.0l12vbadboy
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Registered: 17th Nov 03
Location: Keighley, West Yorkshire
User status: Offline
17th Mar 09 at 10:24   View User's Profile U2U Member Reply With Quote

Doubt it very much.
Unless this has sent your Lamba sensor crazy.

That may not be helping
--ToM--
Member

Registered: 23rd Nov 07
Location: Wirral
User status: Offline
17th Mar 09 at 10:40   View User's Profile U2U Member Reply With Quote

no your exhaust will just blow, do as said above check for air leaks around the inlet throttle body area, check the mass air flow meter by restricting it with selotape, then try the throttle position sensor unplug it and see theres any change then do idle control valve, trial and error mate im having same proplems with my xe
FruitBooTeR
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Registered: 18th Jan 07
Location: Wolverhampton Drives: S15
User status: Offline
17th Mar 09 at 10:56   View User's Profile U2U Member Reply With Quote

Thanks

how do you restrict the mass air flow meter with celotape? unplug the sensor and cover hole then see if anything changes?
--ToM--
Member

Registered: 23rd Nov 07
Location: Wirral
User status: Offline
17th Mar 09 at 12:28   View User's Profile U2U Member Reply With Quote

dont totally cover it jus restrict the size of it go around the outside of it say it has a 3" diamater restrict it to 1.5" diamater to see if theres any difference
john_c20xe
Member

Registered: 10th Feb 08
Location: Eastbourne, EastSussex
User status: Offline
17th Mar 09 at 21:31   View User's Profile U2U Member Reply With Quote

check the wires going to coolant temp sensor also relace this

 
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