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High idle I just purchased a 2008 mercury mariner 3.0.. It seems to idel to fast on a cold start. Approx. 2200 rpm. It doesn't last to long and will drop down in about 30 sec. I've done nothing about it yet, but it seems unusual.

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  • Cars & Trucks Master
  • 76,649 Answers

That is not to fast.

Posted on Mar 22, 2014

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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chuck943
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SOURCE: 2007 crown vic 4.6 l idles high on startup

This sounds like a normal condition.What happens is the cold start emission reduction component monitor(software program in the computer) is running.
Cold Start Emission Reduction Component Monitor
The Cold Start Emission Reduction Component Monitor was introduced for the 2006 MY on vehicles that meet the
LEV-II emission standards. The monitor works by validating the operation of the components of the system
required to achieve the cold start emission reduction strategy, namely retarded spark timing and elevated idle
airflow.
When the CSER strategy is enabled, the idle air control system will request a higher idle rpm, elevating engine
airflow. While this CSER elevated airflow is requested, the low airflow test compares the measured idle airflow from
the MAF sensor to the commanded idle airflow from the idle air control strategy.


Posted on Apr 02, 2009

  • 3 Answers

SOURCE: 96 f-150 idles really high

I just solved this problem on my truck after fighting with it for 2 yrs. Mine is the 5.0 though, check your PVC valve and replace if it is bad. After that Take off your IAC and spray down with carb or brake cleaner and scrape all the carbon build up out of it and work the spring inside. you gotta really clean it out though! After that if it's opening and closing easily put it back together and it should work! you might have to adjust the idle a bit to get it all the way. But after doing this my truck went from a 2000 rpm idle down to about a 700! I hope this helps you!!

Posted on Sep 28, 2009

toneman2121
  • 775 Answers

SOURCE: RPM run high and slow to drop down

a vacuum leak will cause a high idle due to he fact more air is entering the engine which the computer will compensate by adding more fuel. also, a faulty fuel pressure regulator will increase fuel pressure delivering more fuel than required.

look for broken or detatched vacuum hoses. check fuel pressure; 30-50psi

Posted on Apr 09, 2010

agent91
  • 2100 Answers

SOURCE: I have a 1987 Susuki Samurai, 1.3 engine. Cold

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.

Posted on Jul 03, 2010

alicantecoli
  • 22219 Answers

SOURCE: Engine idle problem. Range Rover 4.6 HSE 1998 Have

sorry but you have tried everything i would have done except that i would have checked the engine breather pipes for deterioation like perished or soft and collapsing .you would be surprised how often this is the main cause of this sort of problem

Posted on Aug 21, 2010

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2 Answers

High idle at start up 2200rpm then slowly drops but always seems high have to ride brakes to stop


Long High idle after start up - YotaTech Forums

www.yotatech.com/f116/long-high-idle-after-start-up-246386/
Dec 20, 2011 - aviator's Avatar ... When the high idle is no longer needed the piston retracts and the throttle ... Sometimes the piston gets gunky and slow to react... clean the ... you are already idling higher then normal the idle up will only be worse... for ... it takes to kick down when I first start it up, high idle is at 2200 RPM it ...Missing: lincoln

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Oct 27, 2007 - ... King Ranch · Lightning · Lincoln Blackwood & Mark LT · SuperCrew · SVT ... my 2000 when its been sitting goes up close to 2k then drops down in seconds. ... so what your saying is when it's cold outside I can expect it to start andidle at 2200 rpm. sounds pretty off to me. ... Vehicle: 2004 Ford F150 5.4L. 4.6l Intermittent High Idle. Why?
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Nov 30, 2015 | 2004 Lincoln Aviator

1 Answer

Why does idle speed surge?


Thread: 6.0 V12 XJS High RPM When Warm - Jaguar Forum.co.uk

www.jaguarforum.com/showthread.php?t=54266
Mar 3, 2013 - I recently bought a 1993 6.0 V12 XJS and when it is started from cold it runs ... to 1300 RPM so it wants to surge forward when braking which is strange. ...Classics · XJS 3.6,4.0,5.3 & 6.0; 6.0 V12 XJS High RPM When Warm ... You might want to adjust the aux (extra) air valve to bring the idle speed down.

Sep 25, 2015 | 1989 Jaguar XJS 5.3

1 Answer

Why over reving in idle?


too much air can be caused by binding throttle cable/linkage try disconnecting it. Next would be cold air bypass that lets extra air in for cold weather and initial startup. It would be located on the throttle body
with 2 wires that operate a solenoid. These become gummed up and can be cleaned with carburetor cleaner. Next the EGR valve on the intake manifold could be leaking. Check for cracks or leaks and sometimes the base it mounts to is plastic and wears out. Lastly is the dreaded vacuum leak. There are so many places and hoses to check that I would need to see for myself. The larger hose can go to power booster for brakes. Intake manifold gasket can also leak due to worn gasket.

Aug 09, 2014 | 1996 Toyota Previa

1 Answer

My 2.0 engine idles fast on a cold start. Then idles down after warming up.


This is normally the way it is suppose to work. You need to have the RPM measured for High RPM and duration. What you are describing is how an electronic choke is suppose to work.

The errors would be how high the RPM goes and for how long it lasts. When cold the RPM, fuel mix and timing are changed to give a rich fuel mix. As the O2 sensors warm(Could be defective) they signal the engine to lean up. The water thermostat also has something to do changing the engine to a lean running slow condition.

If obtaining heat from your heater seems to take Forever, the thermostat could be weak. This would coincide with the engine continuing at a high RPM longer because it is not warming up.

Sep 22, 2013 | 2005 Ford Focus

1 Answer

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

1 Answer

When started idels high about 2000 rpm then drops when hot cold ?


the iac probably has carbon built up around it this controls the idle speed try cleaning it first,if not it could be a bad iac or a vaccum leak that the iac takes some time to compensate for to control idle.

Sep 17, 2009 | 2002 Jeep Wrangler

1 Answer

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


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.

Jan 17, 2009 | 1989 Mercury Sable

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