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Air valves, throttle bodies and a high idleViews : 876 Replies : 4Users Viewing This Thread : |
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Jun 6th, 2002, 18:46 | #1 |
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Air valves, throttle bodies and a high idle
The wardrobe's at it again..... x(
Question 1. She seems to idle very high on startup (3k ish) and occasionally just sits at traffic lights at around 1000 / 1500 rpm. Any technical guru's know what I have to clean, replace or generally butcher and how would be nice ? I've searched the posts and found nothing very detailed on this :( Question 2. When my turbo recirc's through the K&N cone filter I can hear it (normal I know) but latley it sounds "flappy" like the wastegate is flapping, not just opening. Any guesses how I can check it ? Jim, '96 855-R (The FLAPPING Wardrobe) :+ |
Jun 6th, 2002, 22:47 | #2 |
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Last Online: Apr 24th, 2008 19:02
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Location: Leicester
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RE: Air valves, throttle bodies and a high id
The problem is Jim that you've now tinkered sufficiently to make all "standard"-based posts about idle speed irrelevant.
While I know that this is anathema to the dedicated tweaker, I would suggest a visit to them as has the OBD kit and a thorough fettle and adjust. Once you've regained normality, you can start changing it all over again.... |
Jun 7th, 2002, 00:08 | #3 |
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RE: Air valves, throttle bodies and a high id
Simon,
I beg to differ.... the car has been spot on for a year now in its disgracefully modded state, however the start up idle has gone donkey in the last 10 days....suggesting to me that something in the idle "valve??" region is a bit sick...... hence my original question When last visiting Volvo (3 months ago) they checked the car out thouroughly, because I asked them if it was likley to upset things having the K&N a bleed and a heavy right foot. They said no need as the car would tell us if it was unhappy, I insisted and volunteered to pay so they plugged in, switched on, tinkered and produced a bit of paper stating that all relevant figures were within tolerance of the ECU's limits. So the question remains.......... WHAT has got mucky or died to produce a high startup idle? And WHY does my wastegate sound like a very powerful whoopee cushion ??? Jim, '96 855-R (The Local Dealer Tested and approved Flying Wardrobe) |
Jun 8th, 2002, 19:45 | #4 |
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RE: Air valves, throttle bodies and a high id
Hi Jim
I had same trouble} Try looking at the small air vacume pipe that pluggs into the end of the manifold cambelt side under your water thermostat. You will probably need a torch to see it but it is a common problem the elbow rots away. This will cause your car to idle between 800-1500 and give u idle problems at traffic lights, If that is not the problem try cleaning your Air idle valve out with WD40 untill you can hear it moving inside. I did these operations to my 96 850 T5 and have no problems my car has also been modded and with a K/N filter my car sounds like wastegate is loose but it is not as i have taken it apart before. Hope this helps you Jim thanks Leigh (bigbird) |
Jun 10th, 2002, 10:22 | #5 |
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RE: Air valves, throttle bodies and a high id
Ahhhh something constructive !
Thanks Leigh, I'll go hunting by lamplight for this little pipe.... wish me luck (although the cam belts being done soon for a ridiculously small amount of money - maybe it'll be more visible whilst its being done?) Where precisley is the Air Idle Valve ?? I've heard of it but never had the guts to try it ! :) Somewhere around the throttle body I guess ??? As for the wastegate..... I've had some more info from someone who does a lot of turbo'd car work, and I quote: ************************************************** *************** I then went onto driving the car 'hard' and could clearly hear the BOV opening as boost levels reached the 11 psi mark upwards. It was not a full opening type of sound, more a sort of 'leak off' sound. I can only summise that the BOV does not like the extra boost, ie the closing spring is too weak. I would be interested to know if any one else has experienced this, or would be willing to try it for themselves. It would also be interesting to see what a manual car does in the same scenario. ************************************************** *************** This chap has since dismantled his turbo to check it out and found that the spring operating the gate - whilst within correct tolerance - is not strong enough to hold itself shut during heavy boost. I guess I should turn my bleed down a little bit !! The other option is a hybrid turbo & proper wastegate..... megga money !!!!!!! Jim, '96 855-R (The Flying Wardrobe) |
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