1999 Peugeot 406 erratic,overheating

Could check / clean the idle control valve and check any vacuum pipes off or leaking .Could be faulty electric fan thermal switch which would stop fan kicking in when reaching right temp to cool engine .

many thanks for reply,what`s the best way to clean idle control valve and to check thermal switch
jf

This should help you with overheating ,


http://www.honestjohn.co.uk/forum/post/index.htm?t=33980

The erratic idle , if not what suggested before , could be throttle body / stepper motor needing cleaned .This explains , from others with same prob .


Peugeot 406 petrol idle speed
9 April 2007, 10:15 PM pug1
Joined 22 Jan 2006
560 posts


i agree with LB sounds like the idle stepper motor is sticking so i would take it out and with some carb cleaner (aero sol) and a rag clean it as its probly gunged up with crap. dont go to the length i did and strip the entire intake as that takes time.


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Peugeot 406 petrol idle speed
9 April 2007, 11:10 PM
Edited by L.B. 9 April 2007, 11:11 PM L.B.
Joined 5 Dec 2005
3310 posts


The idle speed control valve is close to the throttle butterfly on the manifold and although there is a choice of bosch and sagem injection systems for these 1.8 engines the idle speed valve is located in much the same place.
When you remove it the only thing I find thats much use for cleaning these things out well is carb cleaner, failing that if you could temporarily try one from a friend or someone you know if they had a similar car or even a scrappy one just to see if it would work, that way costs are minimised.
In my experience of cleaning out idle valves, it's really only a temporary measure as if faulty the cleanout will only delay further problems with it but it will at least let you know if it is actually the fault before parting with any money.




Peugeot 406 petrol idle speed
10 April 2007, 8:45 PM starcott
Joined 8 Apr 2007
11 posts


Thank you for all the helpful advice posted. I hope to remove the idle speed stepper tomorrow for cleaning.
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Peugeot 406 petrol idle speed
12 April 2007, 9:51 PM starcott
Joined 8 Apr 2007
11 posts


Problem solved. Cleaned idle speed stepper motor and immediately revs down to below 900.
Thanks again.
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