 Black Knob On The Throttle Body, setting idle ? |
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| Black Knob On The Throttle Body, setting idle ? |
  Jul 13 2008, 05:43 AM
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#1
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 Newbie Group: Members Posts: 7 Joined: 13-July 08 Member No.: 45,482 Status:  Location: Highbridge,KY. USA Drives: '88 744GLE  |
What's the # of turns out from seated for the black knob(idle) on the '88 740GLE~ LH-Jetronic2.4 throttle body
The black knob is on the bottom of the throttle body & has an allen wrench type hole in the top. The Haynes manual suggests using it to fine tune the idle but list no initial setting. I have it set to where it's always been after i cleaned the throttle body but i'd like to know if there's an initial factory setting OR steps to properly set the knob to provide optimum performance from the throttle body. It's just a threaded nylon knob that screws into a addition to the throttle body. the car runs w/ the knob screwed in all the way as well as out all the way. I do know that a turbo model volvo i have doesn't have this piece on the throttle body. If someone out there has one with the knob on it; please count the # of complete turns from fully seated & let me know. The further out it is set, the more i hear a "shwooshing" sound from the throttle body. Please, No answers that begin with "I think" or "Maybe". |
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Jul 13 2008, 09:07 AM
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#2
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 Expert  Group: Members Posts: 605 Joined: 25-August 06 Member No.: 19,150 Status: Location: Yateley, UK Drives: 1989 740 SE AUTO, 1993 940GLE Turbo 2.0i |
Yes its the air idle mixture valve, wind it in to make it richer and out for leaner i think. 50% chance on that being right.
Matt |
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Jul 19 2008, 02:37 AM
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#3
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 Newbie Group: Members Posts: 3 Joined: 15-April 08 Member No.: 41,080 Status: Location: Australia Drives: Volvo 740GL 1989 |
My 740's been puffing out a bit of black smoke lately, could that be a result of this little knob being out or in too far? ..it just suddenly started and i have no idea how. I ain't the most mechanically minded person but i love my Volvo dearly.
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Jul 19 2008, 08:26 AM
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#4
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Expert Group: Members Posts: 605 Joined: 25-August 06 Member No.: 19,150 Status: Location: Yateley, UK Drives: 1989 740 SE AUTO, 1993 940GLE Turbo 2.0i |
well if you run it and let it warm up, then wind it in, either the revs should rise or fall, it should be idling at around 750 rpm, or just a few mm under the 1000rpm mark on the tach. you can do it that way.
if its still pushing out black smoke then its running far too rich and seeing as you have lh 2.4 (are you sure on this) then it could be a few things. is it running smoothly when its putting oput black smoke or is it quite lumpy? it could be fouled injectors or spark plugs. Matt |
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Jul 19 2008, 11:53 AM
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#5
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Newbie Group: Members Posts: 7 Joined: 13-July 08 Member No.: 45,482 Status: Location: Highbridge,KY. USA Drives: '88 744GLE |
Correction:
I'm the one that stated an LH 2.4. |
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Jul 19 2008, 04:51 PM
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#6
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Expert Group: Members Posts: 605 Joined: 25-August 06 Member No.: 19,150 Status: Location: Yateley, UK Drives: 1989 740 SE AUTO, 1993 940GLE Turbo 2.0i |
ahh fair enough. i just realised having looked on my lot, with lh 2.4 you shouldnt have a black knob, its all done by the air idle control valve. can you post a pic of the knob you mention?
Matt |
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Jul 19 2008, 10:29 PM
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#7
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Newbie Group: Members Posts: 3 Joined: 15-April 08 Member No.: 41,080 Status: Location: Australia Drives: Volvo 740GL 1989 |
QUOTE(SykO @ Jul 19 2008, 11:26 PM) ...if its still pushing out black smoke then its running far too rich and seeing as you have lh 2.4 (are you sure on this) then it could be a few things. is it running smoothly when its putting oput black smoke or is it quite lumpy? it could be fouled injectors or spark plugs. Matt[right][snapback]86848[/snapback][/right] Its idoling rough and putting out black smoke. I paid for a full service 2 weeks ago then got a major rear main oil leak fixed last week, i dont know if my mechanic may have touched something or knocked something to start this problem.... |
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Jul 20 2008, 08:48 AM
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#8
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Expert Group: Members Posts: 605 Joined: 25-August 06 Member No.: 19,150 Status: Location: Yateley, UK Drives: 1989 740 SE AUTO, 1993 940GLE Turbo 2.0i |
well if it happened immediately after the work you had done, take it back to the garage and say, they should sort it.
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Jul 21 2008, 06:24 AM
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#9
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Newbie Group: Members Posts: 3 Joined: 15-April 08 Member No.: 41,080 Status: Location: Australia Drives: Volvo 740GL 1989 |
it happened about 2 days after but, yeah, i am going back this week. Thanks SykO
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Jul 21 2008, 09:10 AM
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#10
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Expert Group: Members Posts: 605 Joined: 25-August 06 Member No.: 19,150 Status: Location: Yateley, UK Drives: 1989 740 SE AUTO, 1993 940GLE Turbo 2.0i |
no problem mate. give us an update on proceedings.
Matt |
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