| Saxo Engine/Performance If you're interested in tuning Saxo engines, or if you need to know something which is engine related... this is the place for you. |
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3rd March 2008, 00:15
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#1
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Saxperience Post Whore
Join Date: Feb 2005
Location: Billericay, Essex (England)
Posts: 6,774
Car(s): 1.1.1i, 2.Mk2 VTR 3.Astra SRI 150
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Over revving when cold?
I've had a quick look at the FAQ http://www.saxperience.com/forum/showthread.php?t=51637 but i dont know what would cause it. It only does it when its cold so i'm not particuly worried but the car holds onto its revs at about 1.5k. any1 else have this?
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Ben_L aka Saxmaniac5 Xbox Gamertag: Saxmaniac5 
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3rd March 2008, 00:18
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#2
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Frequent Poster
Join Date: May 2007
Location: Huntingdon, Cambs
Posts: 498
Car(s): 2008 YBR 125
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when first started or when warm? when it's first started it's on choke and will be overfueling like a bitch, which means it idles higher until it warms up
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3rd March 2008, 00:20
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#3
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Saxperience Post Whore
Join Date: Feb 2005
Location: Billericay, Essex (England)
Posts: 6,774
Car(s): 1.1.1i, 2.Mk2 VTR 3.Astra SRI 150
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yeah its from cold like starting in the morning. i though it might have been because its on choke but wasn't overly sure as my old one didn't do it. i must stop comparing my old car to my new one 
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Ben_L aka Saxmaniac5 Xbox Gamertag: Saxmaniac5
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3rd March 2008, 00:36
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#4
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Saxperience Forum Bum
Join Date: Mar 2007
Location: Maidstone, Kent
Posts: 4,121
Car(s): Mk2 Posi Blue 1.1
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Mine does this now and again, or it will sit and rev itself from normal idle and upto 1400rpm ish and back and will sit doing it for 5 or so mins. Its weird really when it does that...
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3rd March 2008, 09:50
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#5
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Established Member
Join Date: Dec 2007
Location: Southampton
Posts: 2,278
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We've had countless problem setting the idle on our demo car, set it to 1000, turn it off, straight back on, 1500, and so on
Very strange, sorted now 
Ross
RCD.
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3rd March 2008, 10:05
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#6
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Saxperience Post Whore
Join Date: Mar 2003
Location: United Kingdom (England)
Posts: 7,064
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Quote:
Originally Posted by acemastr
when first started or when warm? when it's first started it's on choke and will be overfueling like a bitch, which means it idles higher until it warms up
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Saxo's don't have chokes! Only carb'd engines have them!
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Stu QIf in doubt, just repeat the answer to the question....
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3rd March 2008, 10:47
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#7
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Established Member
Join Date: Jan 2008
Posts: 1,802
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Saxo's have "idle up" stepper motor IAC valves. These control the amount of air bypassing the throttle butterfly. When more air goes in, the MAP reading increases and the ECU provides more fuel to go with it. When the Coolant Temp Sensor is reading low, it will also add more fuel based on this lower operating temperature.
If a carb'd engine has a choke, what's the difference? YOu open the butterfly more, and put more fuel in!
Andy
RCD Performance
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3rd March 2008, 20:28
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#8
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Saxperience Addict
Join Date: Jun 2006
Location: Wirral
Posts: 13,584
Car(s): Wickerd red VTS MK2,
Two tone VTS MK2,vvc Metro..
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Hi there,ive had the same problem only in the last few days,so ive fitted a new idle control valve.Now its only doing it once.So ile have look at the stepper motor....
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