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Engine idle running fast - Focus Ford Cars & Trucks

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Do u have idle valve or E-tb

Posted on Oct 16, 2013

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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

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

Fast idle


Sounds like your throttle position sensor is bad.
Take it to Auto Zone and ask them to pull any computer codees that may be latched. Not sll codes trigger the check engine light

Apr 04, 2010 | 1999 Buick Century

1 Answer

What kind of carb does the 76 c10 4x4 come with need to adjust


mcdevito75 here, The fast idle is needed when the engine is cold to make the air and fuel mixture rich to keep the engine running while cold, the carb. choke doew this with a bi-metalic spring in that balck round box on the side of the carb, a screw also hepls keep the choke closed until warm up, this screw can be adjusted tpo control how tight it holds the choke cloesed, here"s how to adjust this screw to slow fast idle speed, Locate on the carb, where the gas pedal connects, have a friend operate the gas pedal with the engine off, once you locate the linkage, you"ll also see 2 screws with springs around them, 1 is for fast idle the other for regular idle, you want the fast idle screw, notice this screw will lay against and Half moon shaped tab, while the other screw lays against a shaft, you need the screw that lays against the half moon shaped tab. Start the engine and step on the gas pedal slightly and relaease, at the screw that lays against this half moon, simply turn it counter clockwise or toward you just 1 2 or 3 turns very slowly, you'll hear the fast idle come down but you don"t want the fast idle to low, listen to the engine very carefully, slow it down just a bit, it should still race though but not out of control. Of course for a full carb, adjustment the shop should handle that., but this info will help.

Mar 29, 2010 | 1978 Chevrolet C1500

3 Answers

Engine idle speed too fast some times. idle speed


Three things to check for:

1) High idle switch is on..*(vehicle thinks AC is running but it isn't.
You can try turning on the AC and see if the engine slows down to confirm this one.

2) Sticking or worn out Idle Air Control or IAC, You might get a check engine light with this one.....you might not if it's a mechanical failure.

3) Simplest of all. A vacuum leak. You can get the engine vacuum read while running if you go to a mechanic with a vacuum guage or an OBD 2 ecu code reader. There should be specs on what vacuum levels are normal for you car at idle.

Good luck and be careful!

Dec 29, 2009 | 1996 Isuzu Trooper

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

87 Ford F150 idles too fast


either a vacuum leak or an idle air control valve problem most likely.the iac is on the side of the throttle body.cylinder shaped with a small harness.

Jun 11, 2009 | 1987 Ford Ranger

1 Answer

1987 volvo 244 intermittent fast idle floods after shut down


The coolant temp sensor sends signal to the ECU and the ECU adjusts the idle RPM. When the coolant is cold, the engine requires more fuel to sustain idle with thick oil (oil gets thicker & more viscous when cold). This makes the engine to idle at faster RPM but it should settle down to 850 RPM or so after the coolant warms up. The sensor is nothing but a thermistor; a device that changes electrical resistance according to the coolant temperature.

Apr 05, 2009 | 1987 Volvo 240

1 Answer

Idles too fast. Back pressure in case. How do I fix this?


Clean out the blockage in the engine gas recirculation and or idle by pass.Sounds like a blockage or the idle bypass has failed

Feb 15, 2009 | 2001 BMW 325

1 Answer

Idles fast


Check for a intake manifold leak, we had some problems with seals used on the upper section of the intake on your engine, get a can of carb spray and spray it around the intake, see if the engine reacts, if it does you have a leak.

Sep 26, 2008 | 1993 Lincoln Mark VIII

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