156 idle trouble

[Feilim]

Hey People,
I've got a 96 156 2.0 ltr tspark and when its hot it idles at 2000 revs but cold its at the usual 1000 any ideas as to how i can fix this would be great
Cheers
Feilim O Reilly

[mopar]

Well first of all the 156 didn't come until 1998 so I take it that you own a 155.
Anyhow, your problem could have many reasons, one would be an airleek and another could be a faulty temp-sensor for the injection.

Airleeks you could check by spraying "start-sprey" around the inlet and hoses while having the engine on idle, if it rews up you are having an airleek there you sprayed.

/mopar

[enormous sage]

I would suggest a couple of things that are worth a try :-

1) The idle control valve (or stepper motor) - may be clagged up with oil and muck from the engine breather. This causes the valce to stick and thus let more air through at idle and up your idle speed (my 146 did this)
You can clean them out using meths or white spirit.

2) Check the clean air side hose from the air filter to the throttle body : make sure it's not split (like the one on my spider!). You can fix them with duck-tape until you can get a new one... yes I know it sounds horrible but it works!

3) Not sure if the 155 would have an air flow meter, but these are notorious for causing trouble. I have cleaned these with meths in the past but you need to be very careful!

Hope this is of some help.