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Focus low idle speed

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Focus low idle speed
21 September 2009, 12:07 PM

steve Keen
Joined 21 Jun 2005
23 posts

my focus 1800 petrol zetec V reg has started to suffer with a a problem which causes the idle speed to drops too low before it settles at a higher idle speeds, it sometimes stalls after taken your foot of the accelerator pedal, the idle speed is steady but it does seem a bit low, i have cleans the idle control valve this has not made a great difference.
The plugs and leads are new plus a replacement air filter, but the problem persist.
Anyone have any ideas of what i need to check , clean or replace?.
Any suggestion would be gratefully received.

steve

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Focus low idle speed
21 September 2009, 2:57 PM

bas saph
Joined 20 Dec 2007
2035 posts

does it do it alll the time or mainly when hot or cold ? Their is a few sensors that could cause from what ive heard

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Focus low idle speed
21 September 2009, 5:57 PM

steve Keen
Joined 21 Jun 2005
23 posts

HI,

Thanks for reply, its not so noticeable first thing when its cold and getting warmed up , but the engine soon warms up and that when it gives the problem, the idle speed is a bit low as well.

steve

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Focus low idle speed
21 September 2009, 7:01 PM

bas saph
Joined 20 Dec 2007
2035 posts

Not an expert by far but people talk of the crank sharft sensor (this controls the timing), also the mass air flow meter ? (this controls the air/fuel mix) Temerature sender this also affects the fueling. Sorry I can only give idea's of what Ive heard on here. But you did good to cover the basics first. Hopefully someone might be able to narro it down a bit. temp senders are not exspensive.

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Focus low idle speed
21 September 2009, 8:53 PM

steve Keen
Joined 21 Jun 2005
23 posts

Hi,

Thanks for suggestions, come to thinks of it the temperature gauge is a bit intermittent i.e. sometimes it shows a reading sometimes not , will give that a try by replacement will post the results here.
Any way i could check out the air flow meter, clean it or test it with voltage /resistive meter.
Would the faulty temperature Sensor cause the low idle i wonder?

steve

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