Important! : Saxo idle issue

1. 2shae Newbie Joined: Jun 2016 Posts: 5

   #1 30th September 2017, 15:19

   Dear friends i have one strange issue with my saxo (1.0 CDZ). It revs itself..especially when hot. If you are driving it is ok..when putting in neutral it starts to rev itself (revs are jumping up n down) for a while then normalize. Sometimes idle goes so low that car starts to shake and almost cuts out.
   I tried to search for vacuum leaks, none. Diagnostic tool shows lambda fault..so i tried to replace lambda (3 different lambdas) but no success..still the same. Also unplugging lambda didnt help. So my question is?? What the f*** is wrong with this car? I have no idea what to replace. I also tried to replace idle control valve but still the same. All the parts were from scrapyard but i doubt 3 lambdas would be bad and idle motors too. So i think i have another issue. Coolant temperature sensor was replaced too.
   
   So what would it be? Scanner shows lambda, unplugging didnt make any difference.
2. user_20080 Saxperience Hardcore! Joined: Dec 2007 smurfland. Posts: 17346 Ex saxo owner.

   #2 30th September 2017, 18:07

   What year is the saxo?
3. 2shae Newbie Joined: Jun 2016 Posts: 5

   #3 1st October 2017, 17:58

   It is 1999. Recently (20000km ago) i also replaced headgasket. It was done properly..so that couldnt be a problem.
4. MartinObviously Saxperience Forum Bum Joined: Dec 2012 Perth Posts: 3665 Peugeot 106 1.1 Turbo Peugeot 106 1.5D Turbo Peuge

   #4 2nd October 2017, 19:31

   Maybe it is the throttle butterfly position sensor?
5. 2shae Newbie Joined: Jun 2016 Posts: 5

   #5 3rd October 2017, 12:17

   Could be..but why lambda fault???
6. MartinObviously Saxperience Forum Bum Joined: Dec 2012 Perth Posts: 3665 Peugeot 106 1.1 Turbo Peugeot 106 1.5D Turbo Peuge

   #6 3rd October 2017, 19:22

   Quote:

   Originally Posted by 2shae Could be..but why lambda fault???

   It will be a fuel trim fault?
   
   The lambda sends a signal (rich or lean) if it sends the same signal for too long the ECU flags it up. it doesn't mean its faulty.
   
   If you have a sticky injector, for example, the car could be lean on one cylinder. that would trigger a "lambda fault" when the sensor isn't faulty.
7. 2shae Newbie Joined: Jun 2016 Posts: 5

   #7 4th October 2017, 13:40

   Saxo 1.0 doesnt have injectors.it has single point injection..