peugeot 405 sti - engine idle badly

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Wed 6 Oct 2010 11:27
peugeot 405 sti - engine idle badly - kadi
Dearest,
My car have problem with idLe since the warning lamp yellow showing engine with "K" on this lamp. What sensor give the warning light on and what part need to be check?

Thank you
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Wed 6 Oct 2010 15:37
peugeot 405 sti - engine idle badly - mastertechGeoff

It could be a few things, personally I would get your Lambda sensor checked first, it could be overfuelling, have you noticed a decline in mpg ?

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Wed 6 Oct 2010 15:55
peugeot 405 sti - engine idle badly - injection doc

Your car could be suffering an air leak causing a rough idle & this in turn could flag up a lambda fault. To save money have a diagnostic check carried out by a compentent person with diagnostic equipment to interpret the correct information.

even tight valve clearances can cause rough idle which could in turn flag a lambda or fuelling fault.

ie you could have lambda sensor flagged as faulty but caused by an air leak! thats where sadly a few garages lack experinece or training in understanding fault finding.

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Sat 9 Oct 2010 04:37
peugeot 405 sti - engine idle badly - kadi
Ok. My car not used lamda sensor for oxygen. I am interesting your point regarding the air hose vacuum which is used for the bypass throtle..valve pls explain more detail
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Thu 7 Oct 2010 05:46
peugeot 405 sti - engine idle badly - kadi
Ithank y. What lamda and is it oil over flow stop / effect the idle
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Thu 7 Oct 2010 06:58
peugeot 405 sti - engine idle badly - kadi
Since tou talk about air, I just this time focus on MAF, vacuum hose near the throtle which is connected to such small diafrgm from one side and other hose connect to the manifoldafter throtle valve(). It seems the engine now respon better. Now I will open small diafragm which wire connector which is I think go to ECU. Wait n see. If good progrogress than one item sensor it must be noted n proved as one of several input value for ECU/ engine management....
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Thu 7 Oct 2010 08:21
peugeot 405 sti - engine idle badly - kadi
Thank you for your respons. Wht is "mpg"..
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