172 cup not starting? HELP!

[ashcolvin]

hello

I have a 52 plate 172 cup, i can go out to it sometimes and it will start on the key first time, but other time i can go out to it and crank it for 15-20 minutes then it will start and run fine.
Eventually got it started the other day and the light in the middle of the instrument pack was on - i belive it is the limp home light? i couldnt rev it over 3000rpm

I pluged a snap on diagnostic's tester into it and it came up with throttle potensiometer ( sorry about the spelling ) track 1 and 2 crossed.
This made me think that it was possibly a throttle pedal fault.

I then removed the cover for the fuse box in the engine bay with the vehicle running and it cut out straight as, well as soon as i touched the engine wiring harness connector.

I have read about possible wiring harness fault under the air box on top of the gearbox.

I stripped back all the loom but cant see any obvious wiring fault - i could realy do with some advice from someone who has possibly had this fauklt before or maybe have wiring diagrams for the 172 phase 2 clio.

Help would be much appreciated
Cheers Ash

 

[marcushookdale]

m8 i had the same problem along time ago , my throttle body was caked in carbon , and needed taking off and a good washing in petrol,

worth a look pal

sorry didnt read post, i'm murder for just jumping in on the last bit,

sort it out marcus, :sleepy:

 

[ashcolvin]

i already put a new throttle bodie on it ,
Dose anyone know what the yellow relay in the fuse box in the engine bay is for? the one that is posistioned by itself?
cheers ash