Question about 2003 Mercury Sable

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Runs rough at start up and idle then smooths out. Loud hiss coming from under hood

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  • 6 Answers

Sounds like a vacume hose is leaking

Posted on Jan 04, 2013

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: 2000 mercury 4.6 runs rough but idles smooth had

If you have 1-2 hours to fiddle with it here is what you can try. It worked on my 1994 and 2002 "4.6" engines.
The airhorn is behind all of the airfilter ductwork. There are about 8 bolts to remove to take off the airhorn. At the base of the manifold there is a gasket and venting to the EGR. Clean out the grooves and passages to the EGR. Check the EGR valve for carbon buildup. Replace the $10 gasket and reassemble. This should help and if it doesn't it cost $10 and a mechanic can't tell you the EGR is dirty.

Posted on Aug 28, 2009

  • 625 Answers

SOURCE: rough idle

have this car taken to an auto repair and ask for a engine oil flush and engine oil change, that mught help

Posted on May 28, 2008

  • 1 Answer

SOURCE: 1994 Cougar XR7 Engine idling rough and running rough at low and

Not saying this for sure, but I had the same problem, and i have a 1994 xr7 V6 3.8 L , and all u need to do is set the idle down manually because your computer could have seen that the injector was stuck open, and tried to turn up idle to keep up with the amount of fuel being pumped, worth a shot :P

Posted on Feb 21, 2009

alicantecoli
  • 22095 Answers

SOURCE: My 1996 Mystique when under load @ idle runs very

had a similar problem with a VW golf and i traced it to a faulty temperature sensor for the autochoke ,

Posted on Dec 05, 2010

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1 Answer

My 2000GMC Safari after driving for about 5 miles will start to misfire and when i stop at an intersection the engine will idle rough then smoothing out


Start with the basics.
Check the following:
Air filter, spark plugs and high tension leads, fuel filter, all under-hood levels.

Oct 11, 2014 | 2000 GMC Safari

1 Answer

STARTS ROUGH,LOUD NOISE FROM ENGINE,THEN RUNS SMOOTH


It sounds as though you may have a starter bendix failing or the starter bolts may have loosened. Disconnect the battery, crawl under and investigate.
If the bolts are tight, you may want to look into the cost of a new starter.

Good luck

Apr 03, 2014 | 1999 Chevrolet Silverado 1500

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Runs very rough and idles at 950 rpm, is this fast?


Sounds like a vacuum hose leak. Look under the hood for any cracked vacuum hoses and replace. listen for hissing noise.

Mar 07, 2012 | 2000 GMC Jimmy

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Start rough


Sounds like it might be a vacuum leak. Check all the little vacuum hoses under the hood and make sure that they are attached and not split especially at the ends. You may even be able to hear a hiss with the engine running.

Feb 09, 2010 | 1994 Toyota 4Runner

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When in park idle runs high, also sounds loud when shifting


Sounds like you have a major vacuum leak someplace under the hood.Look for any hoses that are broken or came off. You should be able to hear aloud hissing noise if you have a vacuum leak,also could have a intake plenum gasket sucked in or a stuck open EGR valve.

Sep 24, 2009 | 2000 Chevrolet Malibu

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Runs extremly rough at idle runs great at speed


IDLE POSITION CENSOR IT IS ON THE OUTSIDE ONTHE SIDE OF YOUR TBI DISCONNECT THE WIRING IF THE IDLE SMOOTHS OUT IT IS YOUR PROBLEM IF YOU LEAVE IT UNPLUGED IT WILL RUN FINE BUT YOU WILL HAVE A CHECK ENGINE LIGHT

Jun 24, 2009 | 1994 GMC Sierra

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1991 tercel rough run and smoke from under hood at times


Check for antifreeze leak, make white smoke under hood, and check your antifreeze level

Jan 11, 2009 | 1991 Toyota Tercel

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1988 Suzuki Samurai Hissing Sound Under Hood


hi its definatley an air leak if you have replaced the hoses i suggust the next thing you try is see by tighting the carburrettors nuts that hold it to the manifold as these come lose and **** air do the same with the manifold bolts i suspect you will find them loose if not then change the gaskets one at a time with the cheapest first the carburretors then the manifold you may want to go to your car shop and ask for an air leak spray or they may use some other kind of method but basicly you spray it round the carb/manifold and watch to see where the leak is yates210456

Aug 05, 2008 | 1988 Suzuki Samurai

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