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Ford mondeo: my 2005 mondeo 2 litre auto revs up when first

Answered by:MIKE
Technician
Positive Feedback: 99.4 %
Accepted Answers: 1922

in UK Ford

Recent Feedback

Positive

Hey Mike thanks for your quick response, I did exactly as you told me and as of...

Customer Question

my 2005 mondeo 2 litre auto revs up when first started ticks over at about 1100 rpm and revs up on its own if you drive it or freewheel. fuel consumption is down but engine light is off.any ideas?

Country: United Kingdom
Make: Ford
Model: mondeo
Engine: 2000 petrol

Submitted: 285 days and 21 hours ago.

Category: UK Ford

Value: £28

Status: CLOSED

Accepted Answer

Expert: MIKE replied 285 days and 21 hours ago.

MIKE : Hello and Welcome to justanswer....

MIKE : Hi there... can you please give me the cars full reg number..

Customer :

LB 55OWG

MIKE : thank you- while I bring that up - what is its mileage - and service history like?

MIKE : is that LLB ?

MIKE : or LB 55 OWG

Customer :

82000 history good

MIKE : is that LB55 OWG?

Customer :

LB 55 OWG

MIKE : thank you.. is it due a service at all ?

Customer :

in about 3000 miles

MIKE : Ok - I ask because your cause of your issues as outlined on this particular model is one of three things - usually covered on servicing -to explain..

MIKE : 1 is air leaks - inlet air / vacuum leaks on or around the inlet system -pipes etc

MIKE : 2 is dirty IAC valve

MIKE : 3 is dirty TB .. thats the Throttle body

MIKE : So it may be worth, money wise, having the service done now then as its so close- as servcing wouldcover those causes / faults..

MIKE : my aplogies, the system is a little slow tonight

MIKE : If you dont want to have servicing done-

MIKE : then the thing to do is check all around the inlet side of the engine - pipes seals etc and wiggle the pipes etc - any persihed or loose fitting pipes will accentuate any inlet air leaks -

MIKE : any such leaks will cause this problem...

MIKE : If its not that -then the thing to do is remove the top off he TB and using a spray cleaner from car shops for this job, give the TB a thorough clean ...

MIKE : spray liberally down inside the TB and into the orrifices etc - clean to the throttle plate - open it manually and clean the edges of the flap and chamber --with the spray and a lintfree cloth.

MIKE : Other than that , you would have to remove the IAC valve which is at the back of the engine right hand side below the inlet manifiold and give that a thorough clean - its a good idea to buy a new gasket first to refit it--and then see how it is.

MIKE : IF it doesn't respond ...then the usual cause is that it needs a new IAC valve - but usually one or the other as above cures this issue on these engines.

MIKE : So thats your way forward on this one now..

MIKE : That will also cure your fuel / mpg issues as well as that will be having an effect on that for sure..

Customer :

just one question, what does IAC stand for?

MIKE : Im sorry... IAC - Idle air control valve

Expert Type	Technician
Category:	UK Ford
Pos. Feedback:	99.4 %
Accepts:	1922
Answered:	6/27/2012

Experience: 34 years experience of motor vehicle diagnostics

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Expert: MIKE replied 285 days and 21 hours ago.

Hi ..

Thank you for the positive rating - that is highly appreciated..

I just wanted to be sure you noticed that I did respond re your IAC valve question - if you scroll up you will see that there..again though, Idle air control valve.

While this affects / controls your idling, with normal idle , it will hold your revs high as you have if its sticking / dirty inside - or faulty... (just to explain there )

I hope thats all ok for you...

Kind Rgds, MIKE.

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