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Cleaning Your Inlet Control Valve
Published by Deckchair5
09-11-2006
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Cleaning Your Inlet Control Valve

CLEANING THE INLET CONTROL VALVE/ THROTTLE/ IDLE CONTROL/ BUTTERFLY VALVE

SYMPTOMS
Unsteady and too low idle rpm cycling between 700 to 500rpm. No power at tickover as engine is struggling and it's easy to stall. You put the aircon on just to bump up the tickover a bit. Tricky to put on a small amount of gas, nothing happens and then a sudden surge of power, noticeably tricky to accelerate smoothly from low revs.
In a nutshell, it affects rpm from 500-1200rpm range

THE CAUSE
Gunge has built up in and around the idle control valve, a butterfly flap in the air inlet controlling the amount of air entering the engine. It causes the flap to stick when the flap is nearly closed i.e. near the idle position and when the throttle actuator tries to move it the very fine amounts needed to attain a steady idle it struggles against the resistance

WHEN IT HAPPENS
Anytime after 30k miles depending on your environment. Shouldnít affect people on low mileage so much

DEGREE OF DIFFICULTY
Really easy on the 1.6, other variants should be similar
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Once youíve removed the top engine cover, the inlet control valve is real easy to find, right on top of the engine. Just back off the air inlet tube securing clip.
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Right angled circlip pliers work well but you can improvise how to release the catch.
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Pull back the tube and then swing it out of the way for access to the butterfly valve. Best to use a cloth to clean the valve area rather than kitchen roll so you donít lose bits and almost any cleaner like WD40 will do.
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Push the flap carefully open and clean especially around where the flap lies when itís closed. Watch your fingers though

RESULTS
Afterwards, you should get a rock steady tick over of around 700rpm , noticably easier setting of small amounts of gas, even easier smooth gearchange, less stalling, in fact all round a very much nicer and easier drive at low revs
Thanks drdRiz, webtrekker, chrisghz, 306maxi, kramer81 and 20 others thanked for this post
Likes webtrekker liked this post
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Old 16-11-2006   #1
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Re: Cleaning Your Inlet Control Valve

A very well done guide!

Nice job Deckchair5 and very helpul for many people with out the slightest idea of where this valve is located.

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Old 20-11-2006   #2
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Re: Cleaning Your Inlet Control Valve

THANK YOU!! I had to sign up just t express my appreciation for this info. I drive on the M25 and my car had got to the point where it wouldnt idle at all. Imagine that in heavy traffic, nightmare. The car now idles perfectly, its like a new motor. All thanks to this thread. Cheers!
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Old 20-11-2006   #3
Hasta la victoria siempre
 
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Talking Re: Cleaning Your Inlet Control Valve

First class, so easy and so damned effective! Kudos!
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Old 03-12-2006   #4
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Smile Re: Cleaning Your Inlet Control Valve

Thank you so much. I have been struggling to get to the bottom of my stilo's stalling problems for weeks. In desperation found this web site and your excellant advice. It worked a treat the car is 100% better after following your advice.
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Old 07-12-2006   #5
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Thumbs up Re: Cleaning Your Inlet Control Valve

Bravo Deckchair5!
I did it and motor is very very grateful!
Simply and effective! Something what normal service doesn't do, it's not their level!

I'm on LPG, the difference is maybe more effective.

Grateful !!!!!
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Old 03-03-2007   #6
Whaddya mean too old?
 
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Re: Cleaning Your Inlet Control Valve

Glad it worked for you!
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Old 28-03-2007   #7
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Re: Cleaning Your Inlet Control Valve

Cheers dude!
My engine kept cutting out and coming up with engine fault - garage said it was a MAP sensor error, I was goin mad cleanin all the filters out but it still kept happening!
Saw your guide and low and behold I opened up the TB and it was black with grime!!! Clean and shiny now and it has transformed the car!!!
Nice one!
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Old 29-03-2007   #8
Well not all of my fiats
 
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Re: Cleaning Your Inlet Control Valve

I have had the stalling problem for a while now and was about to take into a dealership to get it sorted.
Having read other peoples similar problems and horror stories of dealerships not being able to isolate the problem and using what seems like guesswork at the stilo owners expense, I was of course concerned. (no offense. I'm sure there are some good ones out there)

I have never touched an engine before but thought I would give this a try. Took me 20 minutes. Drove to work today and didnt stall once. Recently the same journey I would stall at least 5 times.

Just need to get my power steering fixed and sort out the misfire now.

THANKYOU
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Old 21-09-2007   #9
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Re: Cleaning Your Inlet Control Valve

Quote Originally Posted by sheriff_stetchers View Post
Cheers dude!
My engine kept cutting out and coming up with engine fault - garage said it was a MAP sensor error, I was goin mad cleanin all the filters out but it still kept happening!
Saw your guide and low and behold I opened up the TB and it was black with grime!!! Clean and shiny now and it has transformed the car!!!
Nice one!
I came on to the forum to see if there was any mention of the problem that I have been having with a 1.6 Stilo Multiwagon. From the description of your problem, it sounds like you had a similar problem. After getting the Lambda sensor changed and cat flushed, the car kept dying on me. The car would idle but I would lose use of the accelorator. I would pull in, turn off the engine, wait a few seconds, restart and all would be fine again for another while. On occasion when it happened the engine would hunt (rev up and dowm) like an old truck or tractor and cut out. The problem usually occured if I was changing down and did not go into low enough a gear.
The "Engine Fault" light was constantly on. The diagnostic showed a MAP (Manifold Absolute Pressure) sensor fault. The garage flushed the manifold in case the sensor was clogged. This worked for about 3 weeks. I changed the MAP sensor to no avail. The garage, after consultation with FIAT tightened some pins in a connector. No luck.
Are the symptoms that I have described similar to those that you experienced.
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Old 25-09-2007   #10
Whaddya mean too old?
 
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Re: Cleaning Your Inlet Control Valve

An unsteady tickover and dying- then yes. Give it a try anyway, it's easy, takes 5mins and will do no harm provided you're careful. What have you got to lose?
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Old 30-09-2007   #11
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Talking Re: Cleaning Your Inlet Control Valve

Big thank you! It does really work...

Paolo Tomasi
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Old 02-10-2007   #12
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Re: Cleaning Your Inlet Control Valve

Is this just for petrols or does the JTD have the same type of control valve?
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Old 05-10-2007   #13
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Re: Cleaning Your Inlet Control Valve

anyone have a idea where this is on the 1.2 2003 model?

Cant seem to locate!!

Regards,

Kieran
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Old 25-10-2007   #14
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Good Job!

Been in the garage 3 times to fix it, each time they clear the fault on the ecu and tell me "all is well". All was not well each time!

Cleaned the inlet valve it sorted the problem! Cheers!!!
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