Question about 1998 Chevrolet Suburban

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High idle - 1998 Chevrolet Suburban

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  • Chevrolet Master
  • 5,678 Answers

Could be TPS sensor or IAC sensor.

Posted on May 01, 2013

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Posted on Jan 02, 2017

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1997. Idle seems a bit high. How can I adjust it? I'm getting awesomely high mileage both city and highway but i think it could improve still more and the idling speed feels too high.


The idle speed is controlled by the engine computer through the idle air control valve , there are no provisions for adjusting idle . If idle is to high or you just think it's high , you need to test ,don't guess . Watch this video that shows what happens when you adjust thing's that you should not . Ford IAC valve test how to adjust minimum idle speed How to do it correctly !

Jan 16, 2016 | Mercury Sable Cars & Trucks

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

High idle at start up - F150online Forums

www.f150online.com/forums/v8.../306364-high-idle-start-up.html
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?
Jul 12, 2005
Dual remote oil filters????
Jun 29, 2001
More results from www.f150online.com

Nov 30, 2015 | 2004 Lincoln Aviator

1 Answer

2001 dodge dakota sport with 2.5 engine idles high when I start it up, continues idling high, when pushing clutch in to change gears it idles extremely high


Does it do it if you disconnect the idle air control valve ?
You need to know if its a vac leak or if the computer is making the valve open too far.

Feb 09, 2014 | 2001 Dodge Dakota

2 Answers

Does high idle consumes more gas??


obviously does, more RPM needs more gas

Mar 14, 2013 | Cars & Trucks

1 Answer

Car engine idles really high then really low, why?


It can be issue with IAC( idle air control valve) causing the problem.


There are many other possibilities causing these idle issues. Engine idles rough.

There are few help links with solutions to troubleshoot such idle issues.

I suggest you refer the link below and follow its troubleshooting details:------

Click the link below:-----

Ford Expedition IAC valve replacing

http://technoanswers.blogspot.com/2012/12/ford-expedition-iac-valve-replacing.html

Bad miss at idle?

http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html

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Stumbling and stalling at idle after engine rebuild?

http://schematicsdiagram.blogspot.in/2012/03/stumbling-and-stalling-at-idle-after.html

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1999 Ford F-150 Idles rough and quits when gas pedal is pressed less?

http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html

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Engine stumbles coming off idle when warm?

http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html

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Erratic idle on car?

http://schematicsdiagram.blogspot.com/2011/12/erratic-idle-on-car.html

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Cold start problem and vehicle shudder around 2500 to 3500 rpms

http://repairhelpcenter.blogspot.com/2012/10/cold-start-problem-and-vehicle-shudder.html

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Low idle when cold out side?

http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html

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GMC Sonoma Stalls and idles low

http://technoanswers.blogspot.com/2012/10/gmc-sonoma-stalls-and-idles-low.html

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GMC Idle Air Control (IAC) Valve Replacing?

http://schematicsdiagram.blogspot.com/2011/12/gmc-idle-air-control-iac-valve.html

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1996 Camry intermittent engine failure while idle?

http://repairhelpcenter.blogspot.com/2011/10/1996-camry-intermittent-engine-failure.html

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Engine quits at idle?

http://repairhelpcenter.blogspot.com/2011/10/engine-quits-at-idle.html

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Car overheats and Air blows hot at idle?

http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html

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High Idle Problem

http://repairhelpcenter.blogspot.com/2012/10/high-idle-problem.html

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While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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Idle flair is noticed on car? Rough idle? car will not idle? Erratic idle speed?

http://technoanswers.blogspot.in/2012/02/idle-flair-is-noticed-on-car-rough-idle.html

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High rpm in neutral? Inconsistant high RPM in neutral?

http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html

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Vehicle stumbling at idle and shows code 54?

http://schematicsdiagram.blogspot.in/2012/03/vehicle-stumbling-at-idle-and-shows.html

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Rough idle, staling and Erratic shifting?

http://technoanswers.blogspot.in/2012/03/rough-idlestaling-and-erratic-shifting.html

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While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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These details will help.

Thanks.

Feb 15, 2013 | 2003 Pontiac Grand Am

2 Answers

High idle then low idle


just do induction / throttle body cleaning - will solve high idle on start up

Nov 12, 2012 | 2002 Chevrolet Impala

3 Answers

What is high idle?


When a car is idling it is at rest.The idle setting refers to the engine revolutions or 'revs'.If the setting is increased so that the 'revs' are greater,the engine will not stall at rest.This is 'high idle'!

May 16, 2012 | Cars & Trucks

1 Answer

1989 f150 302 V8 fuel injected emissions problem. Installed new engine from Ford, blew SKY HIGH on low and high idle emissions. Emission numbers were 10-20x max legal limit (over 3000). Replaced the...


the O2 sensor works on one volt .5 is around the running voltage, i would refit the air hose as it will run the converter hotter at idle.

Apr 26, 2017 | 1989 Ford F 150

2 Answers

Idles to high


You may need an Idle Air Control Valve (a common problem), I would also change the thermostat as well. If its reading cold it will cause the car to idle high.

Apr 13, 2009 | Toyota Camry Cars & Trucks

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