 V40 Erratic Idle, V40 revs all over the place! |
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| V40 Erratic Idle, V40 revs all over the place! |
  Jun 19 2007, 10:51 AM
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#1
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Newbie Group: Members Posts: 1 Joined: 19-June 07 Member No.: 29,286 Status:  Location: uk Drives: volvo v40  |
HI,
Had my V40 serviced, not by Volvo I add, and ever since the idle/tick over has been very erratic! It hunts up and down and then when you pull up at the lights the revs race up to 2000 and slowly fall down. It drives well but just has this problem. The car is 6 years old and done 90,000 miles. Any help much appreciated! Niceandy |
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Jun 25 2007, 07:37 AM
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#2
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Newbie Group: Members Posts: 13 Joined: 21-May 07 Member No.: 28,283 Status: Location: nottingham, uk Drives: v40 1.8 gdi 1998 |
that will be a v40 with a 1.8 mitsubishi gdi engine for a guess.
mine is the same. either put up with it or get a very expensive decoke.... |
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Jun 25 2007, 02:02 PM
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#3
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Senior  Group: Members Posts: 208 Joined: 3-March 05 Member No.: 3,538 Status: Location: London, UK Drives: S40 T4 V-reg |
My dads 1.6 S40 suffered a similar problem and eventually threw a light up. That was caused by the crank timing sensor. It was £30 from Volvo and really easy to change.
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Jun 27 2007, 01:57 PM
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#4
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Newbie Group: Members Posts: 4 Joined: 23-November 06 Member No.: 21,445 Status: Location: UK Drives: V40 T4 |
Had a similar problem a while ago though not as bad. I don't know if all engines have one but there is a housing attached to the air inlet manifold containing the Air Inlet Control valve. I took this off and sprayed it with carb cleaner - lots of black deposits come out and it seemed to unstick the valve. Car now idles beautifully.
http://s40concepts.net/forum/index.php?t=m...8a95a69d359da46 contains step-by-step instructions on how to do this. It's fairly cheap and easy so worth a go. |
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Jul 9 2007, 07:09 AM
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#5
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 Member Group: Members Posts: 41 Joined: 11-May 06 Member No.: 14,614 Status: Location: germany Drives: volvo v40 |
Ill try that, mind you its most certainly the Hydraulic Valve lifters collapsing
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Oct 25 2007, 08:53 AM
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#6
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Newbie Group: Members Posts: 1 Joined: 25-October 07 Member No.: 34,004 Status: Location: DK Drives: 2002 Volvo V40 |
I have similar experiences with idle when engine is warm. It revs dawn to 500 and back to around 750 every 3-5 seconds.. Volvo says I need to have my throttle housing changed. "we have tried to clean it".
The problem started on a vacation when I accidentally filled it with 92 octane. It ran fine but 2 gas-stops later it started.. It might have coked up I guess. It started when I had had the car for about 6 months - engine lamp -. Not until now - over 1 yr after I bought it - Volvo told me (I had another engine lamp flag) which fault it came up with.. By now the Used Car Warranty has expired of course. (In DK this is a £300-350 repair). Any solutions please ? DID they clean it or do they pull my legs ?? |
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Nov 11 2007, 08:10 PM
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#7
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Full Member Group: Members Posts: 122 Joined: 19-August 06 Member No.: 18,970 Status: Location: UK Drives: 2003 Volvo V40 2T Sport |
I have just decoked mine today and works a treat. Having now disassembled the throtlte body, I can't see why it should need to be replaced unless it has a crack in it or the bellows are in some way gone inside the body.
Try following the instructions on the link above, takes about 1/2 hour to remove, clean and reattached the throttle body followed by the same for the air intake valve. Well worth it, throttle response will better if nothing else. |
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