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[cem_devecioglu]

Here is the story for my jumpy idle problem...(when engine is hot)

1.Breathers cleaned (many times)
2.ICV cleaned (many times)
3.Egr blocked

4.ICV changed.
5.CTS changed
6.Throttle potentiometer changed
7.Lambda (O2) sensors changed ......Yess..Problem finito..

[Dazzler]

Well done for finding the problem. As with alot of faults you have to illiminate things first in a kind of order unless you are lucky enough to have someone who can do a proper diagnosis with a Tech 2 or similar. In your case i guess your fault would have been found out that way. Good job matey

[Kevin Wood]

Interesting. Normally would have discounted Lambda sensors at idle but clearly it idles in closed-loop when warmed up.

Glad it's sorted anyway.

Kevin

[cem_devecioglu]

Hi,
in this story EML never light on..We used many times tech 2 ...As there was no code stored it wasnt helpful..

But the idle really made me crazy...

[Dazzler]

Tech2 would have showed the flutuating signal from the lamdas if you had used that part of it

[cem_devecioglu]

Yes we checked..Seems to be normal here ..Voltage was going from minus to plus...But possibly was not fast enough..Anyway neither me and the mechanics was not enough good for using tech 2..

[Dazzler]

Yes we checked..Seems to be normal here ..Voltage was going from minus to plus...But possibly was not fast enough..Anyway neither me and the mechanics was not enough good for using tech 2..

No worries, you got it sorted. Thats all that matters

[magnul]

The voltage should fluctuate from +0.1ish to 0.9ish, not minus to plus

[cem_devecioglu]

This means also I must change my glasses

[cem_devecioglu]

Also I must admit that I see too many nightmares..We checked the cambelt position..We checked the alternator for voltage etc..

[cem_devecioglu]

This text will be helpful for curious cats like me !

 

http://www.lambdapower.co.uk/TechNotes/Tech-3.asp

[JasonH]

What exactly were the symptoms?

My car isn't quite as smooth when the engine is really hot.

[cem_devecioglu]

Hi,

symptoms were :

when engine is cold normal idle
but after a while when the temp reach 90-92 region
waiting the traffic lights the idle become jumpy and car start shaking go between 400 to 800-900

Also I must note that this idle problem become more apparent after thermostat and CTS change.Because mostly car is used from home to job and job to home short journeys..And engine become hot very late..And I tought this idle was normal      

(possibly ECU was going with self mind without the sensors and more happy   )

[Kevin Wood]

Sounds like the sensors were responding a bit slowly (maybe due to knackered heaters) causing a much wider variation of mixture than normal.

Kevin

[cem_devecioglu]

Sounds like the sensors were responding a bit slowly (maybe due to knackered heaters) causing a much wider variation of mixture than normal.

Kevin

Yes. heaters are really suspect..

When I read the technical explanations also there was something important..These sensors are really sensitive to anti freeze which means when you loose the head gasket you need to buy also 2 new lambda sensors..