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Location:
Hobart, TAS
Registered:
July 2002
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How do you stop engine run on!
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Sat, 24 August 2002 01:25
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I just got my 18rgu going and when i turn it off it runs on for like 20 seconds sometimes. How do i stop this?
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Location:
Melbourne
Registered:
May 2002
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Re: How do you stop engine run on!
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Sat, 24 August 2002 08:27
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Book Says:
Adjust ignition timing
Check idle speed, may be too high
Check Fuel/Electrical System
Thermo-Air Cleaner heat Valve not operating properly
Excessive engine operating temperature (Possible causes are Clogged Radiator, Malfunctioning Thermostat, Faulty Water-Pump)
Hope this helps.
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Location:
Brisbane
Registered:
May 2002
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Re: How do you stop engine run on!
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Sat, 24 August 2002 12:29
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Run-on is often caused by "hot spots" in the engine, which are a result of carbon buildup in the combustion chamber. The best fix for this is to pour water into the inlet while the engine is running at 2-3000 rpm. Works like a charm, it dislodges all the carbon and spits it out the tailpipe, along with heaps of steam! 
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Location:
Ipswich QLD
Registered:
May 2002
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Re: How do you stop engine run on!
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Sun, 25 August 2002 01:34
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ohh, and just so u know- ITS VERY BAD to let an engine run-on!
If it doesn't stop after up to 5seconds, drop the clutch! Its the only way i've been able to stop my car over the last 9months, and i've had 5 mechanics look over it, changed timing, adjusted idle speed, remapped dizzy and all sorts of stuff. My problem is that its running too high compression, and the only way to fix that is bigger/another head gasket, or change pistons. Anyway...
If u let it keep running on, u may cause a rod to go through u're wall! Then the motor will be NOT HAPPY JAN!
Thanks
Ben
PS- hope u fix it 
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Location:
Hobart, TAS
Registered:
July 2002
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Re: How do you stop engine run on!
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Sun, 25 August 2002 01:59
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Norbie, how much water should tip in, could i squirt some in each solex carby throat???
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Location:
Canada
Registered:
August 2002
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Re: How do you stop engine run on!
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Sun, 25 August 2002 02:08
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What is your idle speed?
I would first try dropping the idle speed (if possible).
Second, if you can find better fuel (higher octane), often this will stop the run on.
Are the carbs balanced?
If you try the water thing, do not pour too much too quickly.
If you pour too much, you can shorten or break your connecting rods.
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Location:
Brisbane
Registered:
May 2002
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Re: How do you stop engine run on!
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Sun, 25 August 2002 09:18
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When the engine is running at 2-3000 rpm, you'd have to pour in a LOT of water for it to hydraulic lock! Think about the volume of air going through the engine at those speeds. Just make sure the revs don't drop down too far and it will be all good.
Note that the best cure for run-on is EFI! Switch off the ignition and the fuel supply is cut off instantly... engine stops dead.
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Location:
Melbourne
Registered:
May 2002
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Re: How do you stop engine run on!
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Sun, 25 August 2002 13:52
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run water injection and carbon buildup is a thing of the past and everything is shiney inside allways!
might not give you much in the way of power on an NA engine but:
*water is free
*listening to your engine run backwards is painfull
*the look on peoples faces when one day you pull the head off and the engine is spotlessly clean inside is priceless
Allan
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Location:
Tasmania
Registered:
May 2002
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Re: How do you stop engine run on!
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Sun, 25 August 2002 15:35
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OK, you are making me want to run water through every engine just before rebuild now. Maybe I should leave the engine running when I wash the engine bay, and filters off!
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