Question about 1989 Mercury Sable

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High Idle speed on 1989 Merc Sable, 3.0L V-6. Approx 2000 RPM

This problem just started. Suddenly the idle speed went from 600-800 RPM to a little over 2000 RPM.

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  • Anonymous Mar 15, 2014

    engine has started to lose rpm at low and high speeda

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  • 15 Answers

My wife had a 93 ford tempo 4 cylinder with same problem.It turned out to be the idle air solenoid mounted on the air intake manifold.

Posted on Jan 17, 2009

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Toyota corolla hatch 2002 idle at 2000 rpm when


All the above is normal , except 2000rpm is a little high at idle . can be adjusted down to 1500rpm. the computer adjusts the engine speed . in drive the transmission loads up the engine idle drops to 1000rpm . in park engine unloaded rpm increase all normal.

Sep 17, 2014 | Cars & Trucks

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Idle adjustment screw for 95 merc Sable 3.0


I will try to explain new electronic injection. There is an adjustment but you have another problem if the idle speed is too high.

When the RPM goes higher, it means you have an air leak, intake runner problem or higher fuel pressure than the stock setting. Or ISC (idle speed control solenoid) Think of it like opening the throttle slightly and letting more air into the motor or gas into the engine.

You can use a pump spray bottle of water with the engine running and mist the seams and vacuum lines and switches. A change in RPM indicates a leak.

Intake runner. These are like shutters inside the intake manifold. Modern intakes can have 2 levels of airflow separated by the intake runners. Sticking runners can let more air into the engine at the wrong time and affect idle.

ISC solenoid Is a valve that regulates airflow for the idle. Soot can cause it to stick in the wrong position. Removing and cleaning the port with WD40 can help.

High fuel pressure. If the fuel regulator sends more gas to the engine, the RPM will increase.

There is a set screw at the base of the airhorn to stop the throttle cable. It is called a throttle stop. There is a hex hole for an allen wrench and it has been coated with threadlock in some instances. Really it is not meant to be turned once the factory sets it. But you can do it. If anything fixes the defects I mentioned, the idle may be too low. I do not have the Specs or know if you have any optional engine. Generally the engines idle between 525-and 600 rpm.

Please rate my info.

Apr 06, 2014 | 1995 Mercury Sable

1 Answer

1995 chevy silverado cl1500: high idle @ 1800 rpm: replaced all sensors, some twice.


check all vacuum lines very closely for a vacuum leak. might be a small hairline crack that is hard to see.

Dec 04, 2013 | Chevrolet Cars & Trucks

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What should the idle speed be set at on a 1989 jeep wrangler 4.2 liter straight 6 cyl. It has a 2bbl carb. It idles at 1000 rpm right now but seems fast or is that about right?


Most carb. engines should idle between 725 and 750 R.P.M., lower the idle and be sure to check the timing. You should have an emissions label under the hood to explain the idle and timing.

Aug 16, 2011 | 1989 Jeep Wrangler

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What should the idle speed be for a mercury sable 2002 ?


Idle speed or idle RPM, rpm should be around 700.

Mar 03, 2011 | 2002 Mercury Sable

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What does code p1506 mean?


P1506 - Idle Air Control (IAC) Overspeed Error This DTC is set when the PCM detects engine idle speed that is greater than the desired rpm.
  • IAC circuit short to GND
  • Damaged IAC valve
Disconnect IAC valve and look for little or no change in engine rpm as an indication of a stuck or damaged valve.

Oct 17, 2010 | 2000 Mercury Sable

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I have a 1987 Susuki Samurai, 1.3 engine. Cold start is idles at 2000 rpm up to 2200 rpm. Is this normal? Its seems a little fast. How do you adjust the cold fast idle speed? Thanks, Randy


Yeah it sounds kinda high. There is no adj except for the idle screw on the throttle, the computer does the rest, if it has one. If not, then you can adjust it some how. If carbureted, check for 2 little screws in the front, and check the choke, If throttle body, then just the idle screw, the idle should be around 1000. Hope this helps.

Jul 03, 2010 | 1987 Suzuki Samurai

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Hi the idle speed is to high on my daewoo lanos 1600, there is a soultion but i dont know where the power lead that goes to the speed valve in the solution it says top of engine, but i dont know what it...


there is a screw at the end of the throttle cable. get someone to rev the engine an your see it move.turn the screw anticlockwise and the idle should slow. clockwise will raise the idle speed.

Apr 02, 2009 | 1999 Daewoo Lanos

1 Answer

1989 Mercury Sable, 3.0L V-6, Auto Trans. Engine Idles at about 2000 RPM.


Check your vacuum hoses (They are 3/8" Rubber hosing on the right side of the engine, you will need to remove the air intake piping (Also remove the throttle body to make accessing them easier) This is the #1 cause of high idling in the 3.0 OHV and 3.0 DOHC sable engines.

Jan 17, 2009 | 1989 Mercury Sable

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