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How do i stop the engine running at a fast idle


Assuming it is a completely mechanical system with no electrical or electronic control there is no actual fast idle facility unless it is provided by a Waxstat cable device fitted into the cooling system.

I think what you mean is the engine idle speed is too fast rather than it is running at "fast idle" which is a term used for a raised idle speed when an engine is cold and decreases as the engine warms until at normal operating temperature the idle speed should be normal. On an old diesel engine it is the Waxstat device if fitted that provides this facility or a hand operated throttle. Very old cars and trucks had hand throttles for fast idle but later this function was provided by the choke or strangler mechanism. Some luxury cars had an electrical device fitted but the fast idle of modern engines is invariably provided by electronics.

I expect you need to adjust the throttle stop screw of the injection pump. This is at the lever where the throttle linkage connects to the pump and there is generally two stop screws fitted that limit the travel of the lever. One screw limits the maximum travel of the lever and therefore the maximum engine speed and this is generally set during manufacture or remanufacture and sealed to prevent tampering.
The other screw is the idle screw which the lever is pulled against by a spring when at rest.
Before adjustment it is necessary to ensure the throttle linkage is not maladjusted and preventing the lever contacting the stop. Disconnecting the linkage until the idle speed has been adjusted will ensure this and then slacken the stop screw locknut, start the engine and turn the screw in or out as applicable until the desired idle speed is achieved, allow the engine to warm up and make further adjustment if necessary and tighten the locknut and reconnect the throttle linkage. Do not adjust any pump screw except the idle screw.

Good luck!

Mar 01, 2015 | John DEERE CONSTRUCTION LOG SKIDDER NIP...

1 Answer

I have a 1986 GMC 1500 with a 5.0 and stock rochester carb. The truck will start but you must keep gassing it as it won't idle. It kicks off every time. Any suggestions on how to fix this cold natured


fast idle speed screw, works off the fast idle cam which the choke adjustment sets, it works together by linkages. This is the raised idle speed setting you need to keep a cold engine running. First you set the idle speed by the idle speed screw with engine at normal operating temperature. Then you set the linkage up so the cam is on a raised step, throttle will be held on that raised step. then you can turn the idle speed screw to get idle at about 1500-1800 rpm. Now when you start engine cold, choke will set the fast idle cam on that raised step- when engine starts and runs it should be running at your fast idle setting. That's how it supposed to work, you just have to get everything adjusted right. I hate carburetors, they never stay adjusted right. Considering their complexity and small mechanical parts, no wonder.

Dec 24, 2013 | 1986 GMC C1500

1 Answer

Engine runs fast and slow


Take a spray of carb cleaner and clean the linkage mechanism from the governor to the carburetor and make sure they move with out sticking.

Dec 07, 2013 | Briggs Stratton Portable Generator 305cc...

1 Answer

Effect of wrong timing


cam, well that depends on DIRECTION

retarded would cause, lower compression and power.

advanced can be more power fast but not slow.

really that is what VVT does, runs one way for slow, and other for fast.

why do you ask.

curious

yours is?

why not check compression,

if the belt slipped, most go to RETARD.

can moves fast and cam says, i dont wont to and it slips,

the crank over runs the cam. so very easy, with belt.

it retards and compression can fall from 150+PSI to 80,

and engine acts like 1Liter , pip squeak engine.

Jul 13, 2013 | 2003 Honda Stream

1 Answer

2002 windstar in park and engine running fast


The idle speed is controlled by the computer.
Sometimes the throttle body is dirty or gummed up and sticks, or the idle air control valve is faulty.
Is the check engine light on ?

Aug 23, 2012 | Ford Cars & Trucks

1 Answer

Runs to hard on full but runs well


If by to hard, you mean the engine is running way to fast it may have a broken governor. The governor is what controls how fast the engine is aloud to run when the throttle is at full throttle.Also it could be dirty linkage or out of adjustment .

Sep 18, 2010 | Garden

1 Answer

1984 toyota corolla 1.6 engine. How do i adjust


Carbureted models have a fast idle cam on the throttle,It is a screw that sets against a movable part,called the cam,when the engine heats up,the cam will drop upon tapping the gas pedal.Set the carb,while the engine is cold,by tapping the gas pedal,then adjust the fast idle cam screw by turning it in,with the engine running.Start out by turning the screw in a full turn before starting engine so it will run,then adjust the screw as the engine runs.

Nov 26, 2009 | 1984 Toyota Corolla

1 Answer

My 1997 john deere just dont run as fast and hard


check your throtlle cable ... it is very possible that if the engine runs fine just doesn't run as fast as it used to that you throttle cable has slipped in the clamp and you need to adjust it ...

Aug 19, 2009 | Garden

1 Answer

I have a 2005 Jetta 2.5 and it seems like one fan runs to fast


One fan should run when engine is running. Other fan should run when AC is on.

Jun 28, 2009 | 2005 Volkswagen Jetta

1 Answer

Engine runs too fast


I had to same problem. My engine would idle to fast when stopped. And when I drove, it would accelerate on its own. And if I took my foot off the gas the speed would increase.

My fix was a little piece of plastic called the THROTTLE SENSOR.

But be careful some aftermarkets don't work right and you'll have the same prob. Make sure its manufactured by GM

Jan 11, 2009 | 1993 Oldsmobile Ninety Eight

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