Idling Engine
Author
Discussion

GC1

Original Poster:

908 posts

209 months

Thursday 4th June 2009
quotequote all
How do you adjust the idle of the engine or is it cause is got cheap supermarket fuel in it ? need to find somewhere who's got the full 98 SU fuel.......

TuxMan

9,011 posts

267 months

Thursday 4th June 2009
quotequote all
There is a small adjuster on the bottom of the throttle assembly same side as the cable ,i think its a 7mm spanner to adjust it , what makes you think its fuel ? makes no difference to mine what fuel i put in .

Adrian W

15,493 posts

257 months

Thursday 4th June 2009
quotequote all
TuxMan said:
There is a small adjuster on the bottom of the throttle assembly same side as the cable ,i think its a 7mm spanner to adjust it , what makes you think its fuel ? makes no difference to mine what fuel i put in .
Not convinced adjusting the throttle stop is a good idea without knowing why the idle speed isnt right (assuming it is the speed that your discussing)

Gadgeroonie

5,362 posts

265 months

Thursday 4th June 2009
quotequote all
the noble has no idle control valve so if the the idle is off then it can only be the afr or a sensor has failed. check your lambda sensors have not failed. you can improve your idle by adding ign at the idle load sites

hollowpockets

5,910 posts

245 months

Thursday 4th June 2009
quotequote all
Adrian W said:
TuxMan said:
There is a small adjuster on the bottom of the throttle assembly same side as the cable ,i think its a 7mm spanner to adjust it , what makes you think its fuel ? makes no difference to mine what fuel i put in .
Not convinced adjusting the throttle stop is a good idea without knowing why the idle speed isnt right (assuming it is the speed that your discussing)
No its not a good idea, I adjusted mine when i bought the car and it messed it up until service time when a dealer re-set something.

node

732 posts

229 months

Thursday 4th June 2009
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I'd say to start with, change your fuel filter and check to see if there are any kinks in the fuel line.

Adrian W

15,493 posts

257 months

Thursday 4th June 2009
quotequote all
I would suggest you get someone (who knows what they are doing) to plug a laptop in and take a look at whats going on. I would suggest Yellowshed I am biased, contact him via his profile on here.

Edited by Adrian W on Thursday 4th June 19:35

GC1

Original Poster:

908 posts

209 months

Thursday 4th June 2009
quotequote all
some good points guys and thanks so will look tonight......

hollowpockets do you know what the guy adjusted ?

hollowpockets

5,910 posts

245 months

Thursday 4th June 2009
quotequote all
GC1 said:
some good points guys and thanks so will look tonight......

hollowpockets do you know what the guy adjusted ?
Something with a laptop!

TuxMan

9,011 posts

267 months

Thursday 4th June 2009
quotequote all
Adrian W said:
I would suggest you get someone (who knows what they are doing) to plug a laptop in and take a look at whats going on. I would suggest Yellowshead I am biased, contact him via his profile on here.
Yep as Adrian says go and see Yellowshed he checked mine last week and uprated the map and tweeked the idle (with adjuster ) she now runs very very well !!!!! how bad is the idle ??

AMG Merc

11,955 posts

282 months

Thursday 4th June 2009
quotequote all
Agree with the above, have heard that it isn't a good idea to play with the throttle adjustment at all for the reasons given.

GC1

Original Poster:

908 posts

209 months

Thursday 4th June 2009
quotequote all
it runs well for a few mins then starts to virtully stall,then pick ups and goes in a circle .but runs on the road at normal speed ,well.....

Adrian W

15,493 posts

257 months

Thursday 4th June 2009
quotequote all
GC1 said:
it runs well for a few mins then starts to virtully stall,then pick ups and goes in a circle .but runs on the road at normal speed ,well.....
AS your waaayyyy up north, i would suggest resetting the adaptives, on a 3litre you pull the ecu fuse or disconnect the battery for say 20 seconds, it might have got it's knickers in a twist, do this and then go for a drive and this will sort it out.

Don't know about the 2.5

GC1

Original Poster:

908 posts

209 months

Friday 5th June 2009
quotequote all
well didnt play with the throttle stop as it was locked tight in,but did take the slack up on the cable slightly and this seamed to help,but after driving into work were back to square one.

where's the fuel filter,? I couldnt see it,also their seams to be a socket on the top of the engine which dosent seam to have a plug in it,and this is on the fuel side.
Their was a plug hanging down but that didnt match up,so not sure what either are for....

Oh my engine is the 2.5 Build 20 according to the last digits of the vin.

art411y

832 posts

249 months

Friday 5th June 2009
quotequote all
GC1 said:
well didnt play with the throttle stop as it was locked tight in,but did take the slack up on the cable slightly and this seamed to help,but after driving into work were back to square one.

where's the fuel filter,? I couldnt see it,also their seams to be a socket on the top of the engine which dosent seam to have a plug in it,and this is on the fuel side.
Their was a plug hanging down but that didnt match up,so not sure what either are for....

Oh my engine is the 2.5 Build 20 according to the last digits of the vin.
with it being an early car does is still have the original marreli ecu or the upgraded mbe ecu?.if its the marrelli then this ecu is reknowned for idle problems and is not mapable.the marrelli also runs an idle control valve next to the throttle body and this will cause similar problems to what you are experiencing.you can take it off and clean it out with carb cleaner and should make a difference.

GC1

Original Poster:

908 posts

209 months

Monday 8th June 2009
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over the weekend found a plug that was just hanging and found this should have gone into the throttle valve regulator,but it didnt fit so after some triming with the cutters it now fits tight and problem has gone away..

It seems the person before or garage didnt do a good job.......10 min job in the end and Idles now around 800.....