Question about 1989 Mercury Sable

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1989 Mercury Sable GS 3.0L runs rough and idles down and stalls

1989 Mercury sable 3.0L will run ok for a bit then runs rough and the idle eventually goes down and dies. Spark good and fuel pump pressure is in the upper 30's. Could the catalytic converter or bad dirty fuel injectors cause this or what else? It has under 90,000 miles. Please help! Thanks

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Sounds like you might have a stuck open EGR valve. Is the check engine light on. I would replace the fuel filter if it hasn't been replaced, also check the air filter.

Posted on May 31, 2010

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My 97 mercury sable 3.0 is very hard to start once started runs really rough for a second then smooths out


My first guess would be a dirty throttle body or a faulty idle air control valve.
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Is the check engine light on when the engine is running ?

Jul 09, 2012 | 1997 Mercury Sable

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1999 Mercury Sable 24v OHC engine, starts normal but when engine begins to idle it runs rough and dies


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88 mercury sable start service light on then goes out idle rough runs good down the road wont pass emission


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Rough idle


Mercury had a recall on 3.0 duratech motors in 2000 and 2001. If you get a fuel smell at startup then you might have a bad lower intake gasket, it could cause a miss if seal is cracked. Article No. 01-4-3 you can get it on AllData.

Also, check the PC rubber L piece that runs from the PVC valve to under the throttle control - it could be busted.

Make sure ignition wires are not cracked. If you haven't tuned it up in over 30-40K consider doing that.

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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.

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Rough idle


Have you had the throttle valve cleaned?

Here is the most common cause of surges and stalls, it is the idle speed control air-bypass valve and throttle valve, they get full of gunk over the miles and cause idle issues (stalls) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

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