eratic idle problem!

1. dsh85 Saxperience Post Whore Joined: Apr 2005 Teesside Posts: 8800 focus tdci, clio v6

   #1 12th May 2010, 18:35

   right ive been lookin into this a while on my s1 converted 16v
   
   on basic idle the car is eratic revving up and down, it sometime can have a mind of its own by setting at a higher tempo after being revved, once revved again however it returns to the usual 1k ish
   
   ive tried the throttle body from a car with no problems, so all sensors on that with no joy
   
   ive tried crankshaft sensor
   
   just recieved a map sensor as i thought it would be this as it seems to make no difference if its plugged in or not, but this hasnt changed
   
   what else could it be?
   
   im breakign a p reg 1.1 106, could i use the ht leads to see if its my coilpack?
   
   any ideas greatly appreciated
   
   thanks
2. raunchz Saxperience Addict Joined: Jul 2005 Solihull / Bournemouth Posts: 14233 2015 Lapiz Blue Golf R

   #2 12th May 2010, 18:37

   Quote:

   Originally Posted by dsh85 right ive been lookin into this a while on my s1 converted 16v on basic idle the car is eratic revving up and down, it sometime can have a mind of its own by setting at a higher tempo after being revved, once revved again however it returns to the usual 1k ish ive tried the throttle body from a car with no problems, so all sensors on that with no joy ive tried crankshaft sensor just recieved a map sensor as i thought it would be this as it seems to make no difference if its plugged in or not, but this hasnt changed what else could it be? im breakign a p reg 1.1 106, could i use the ht leads to see if its my coilpack? any ideas greatly appreciated thanks

   would hint at maybe a wiring problem re: map sensor ?
3. c20xejay Frequent Poster Joined: Jan 2010 Wakefield Posts: 594 seat leon fr

   #3 12th May 2010, 18:41

   hmm ive just had same problem i changed throttle body and worked out fine.... i know this maybe a long shot but try flywheel sensor ive just been reading a thread about it else where and that was there problem..
   
   are throttle position sensors easy to fit?
4. dsh85 Saxperience Post Whore Joined: Apr 2005 Teesside Posts: 8800 focus tdci, clio v6

   #4 12th May 2010, 18:48

   raunchz i did think that but was also maybe thinknig if summit else is buggering it up maybe its not really gettin round to doin its job properly, i suppose it shouldnt be too hard to check it over it only runs to the ecu right!
   
   flywheel sensor isnt that the same as the crankshaft sensor? (on the front join between gearbox and block)
   
   dont think itll be too hard to fit all the parts were removed from my tb and cleaned up
5. vtr-barn L-plater Joined: May 2010 Posts: 76 Saxo VTR

   #5 12th May 2010, 23:33

   Have u looked at the throttle potentiometer? I had a similar problem and thats what it was.
   Barns
6. dsh85 Saxperience Post Whore Joined: Apr 2005 Teesside Posts: 8800 focus tdci, clio v6

   #6 12th May 2010, 23:51

   Where is this?
   
   what other sensors can affect this?
7. vtr-barn L-plater Joined: May 2010 Posts: 76 Saxo VTR

   #7 12th May 2010, 23:59

   Sorry bud i had a dealer do mine cause i put it in to them when i couldnt locate the problem...£700 later tht was diagnosed so yeah not sure where it was.
8. dsh85 Saxperience Post Whore Joined: Apr 2005 Teesside Posts: 8800 focus tdci, clio v6

   #8 14th May 2010, 07:48

   they should wear a mask and a striped jumper! its stupid the prices they charge!
   
   anyway turned out to be the wiring to the map sensor, one wire was split. it now runs like a dream!
9. Killeybh Frequent Poster Joined: Jul 2009 dy14 8rt shropshire Posts: 580 1.1 desire

   #9 14th May 2010, 09:48

   i got the saame mate, someone said ecu to me