| [ Total Views: 545 | Total Replies: 8 | Thread Id: 5804 ] |
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 KOM123
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| posted on April 29th, 2003 at 10:37 PM |
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Engine idling too high
Just in the last day or so I have noticed that when waiting at light etc (i.e. stationary with clutch pedal full pressed and brake on) that the engine
is idling too high. I'm no mechanic so that's the best I can describe it. Once you get going again in first it drops back down so only ever
occurs when stationary with clutch pedal in. Hmmm what else can I tell you, ummm it's a '76 Kombi with a 2 litre engine and webers on it.
Also don't know if this is related but now when you get to your destinaiton and turn off the ignition, the engine wants to go foir another 3 or
4 seconds before spluttering to a halt.
Is this something an amateur (i.e. me) can have a look at and rectify?
Cheers 
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Andy
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| posted on April 29th, 2003 at 10:46 PM |
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Try and see if it's only when you press the brake? Try applying it for a few seconds, then off for a few seconds. If it idles faster with the
brake on it's a good chance your master cylinder is on the way out.
If not, and considering the running on problem, do the webbers have a solenoid cut off like the stock ones? (the twin solex's had 3 solenoids) If
they play up it can also affect ideling and running on.
Andy
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kombikim
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| posted on April 30th, 2003 at 12:09 AM |
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the Webers have no cutoff, neither does the whole fuel setup in that vehicle (mechanical pump as well) Scott, read about the brake booster in the
manual It describes a test, the booster works on vacuum (suck) from engine, if there is a vacuum leak at idle then the engine will run faster if it is
related as Andy said, to application of the brakes at idle then it is a leak/malfunction somewhere in booster/mastercylinder assembly, if you get
stuck ring me & we will talk through it
the Running On of the engine is related to the problem & was a problem with Kombi motors which is why the original carburettors were fitted with
cutoff solenoids which cut the fuel supply to the idle circuit when you turn off the ignition
Andy,,,,got the envelope thanks, tried to asemble the thing on the wiring diagram & blew up the office
[Edited on 29-4-2003 by kombikim] |
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Andy
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| posted on April 30th, 2003 at 08:24 AM |
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 Just to confuse the enemy :thumb
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KOM123
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| posted on April 30th, 2003 at 11:20 AM |
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Hmmm still high idling regardless of whether or not the brake pedal is engaged....
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Andy
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| posted on April 30th, 2003 at 11:33 AM |
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Possibly another vacuum leak somewhere? Check all your vacuum lines and connections (there's quite a few there!!!)
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Purple Martin
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| posted on April 30th, 2003 at 12:34 PM |
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Maybe your carbies need adjusting: I'm not familiar with Webers but lots of carbies have idle speed adjustment screws which control how much fuel
gets through the idle jets. I had exactly the same symptoms on the same engine with dual solex carbs, after a full tune (including timing) and carbie
adjustment it ran perfectly.
1959 red & white Beetle
1975 Kombi camper
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kombikim
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| posted on April 30th, 2003 at 03:33 PM |
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I checked these carbies & the condition of these, & indeed the whole set up & tune of the engine is to Die for :o - AS IN TO COVERT, any
adverse fiddling with the carbies settings is likely to end up in an expensive tune up
[Edited on 30-4-2003 by kombikim] |
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phatrat
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| posted on April 30th, 2003 at 03:58 PM |
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| Quote: | Originally
posted by KOM123
Hmmm still high idling regardless of whether or not the brake pedal is engaged....
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Bring it over on the Weekend !!!
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jeffh
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| posted on April 30th, 2003 at 04:21 PM |
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Hey,
Do not be afraid of your webers but learn about them BEFORE you fiddle.
http://www.redlineweber.com/html/Tech/idf_adjustment_controls.htm
I have just fitted 40 IDFS to my Kombi and I love them.
I can think of no reason why engaging the clutch should raise the engine speed other than marginally100-200rpm( due to not having to turn the
gearbox)
check the linkage first to see if it is fully closing.
Jeff
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KOM123
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| posted on April 30th, 2003 at 09:28 PM |
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Thanks for the replies so far will check a few things over. DakDat I might take you up the weekend visit offer if I can't get things sorted by
then
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70AutoStik
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| posted on May 1st, 2003 at 10:22 PM |
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Idling high, then running on (or dieseling, as it's often known in the trade,) is usually a sign of a lean mixture. Accept the offer of help, as
running lean can cause damage to your engine.
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Buggy Boyz
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| posted on May 3rd, 2003 at 10:09 PM |
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Check ...
Check the end float of the engine .. If it has a heap I would bet that is the problem.
When you put the clutch in you push the crank back which changes your timing on the dizy so your idle goes up. Seen it a bit in 1600, pretty funny
cause most people don't beleive you till they see it, ask 555BUG .. |
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