Question about 2004 Ford Explorer

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1998 explorer low idle when warmed up

1998 explorer stats fine idles smooth but very low when warmed up. also after cleaning throttle body i hear a on off hiss from drivers side somewhere down low when in drive with my foot on the brakes.

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Sounds like a vac leak

Posted on Jan 26, 2009

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Posted on Jan 02, 2017

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2 Answers

Why does my 1998 gmc jimmy rpm drop so low when its warm causing a miss in the engine


The truck ECM computer controls the idle speed based on a number of engine parameters. Idle drops to a minimum preset level when engine coolant reaches normal operating range and the engine goes into closed loop control. This idle is typically set at around 575 rpm, and cannot be changed without reprogramming the ECM. The miss is not caused by the idle speed - unless the engine is tuned properly and has not lost compression, this idle speed can result in a rough running engine at idle (typical with older 4.3L Vortec engines). Best bet is to get a complete tuneup which will include checking the O2 sensors, catalytic converter and cleaning the IAC valve and throttle body.

May 20, 2014 | 1998 GMC Jimmy

1 Answer

Why does my 1989 camry 2.2 4 cylinder at initial start-up idle smooth, but upon warm-up idle rough and erratically.


Clean throttle body might help
ck alt 12.5 iDle 13.5 1000 rpm
also run gas low and put fresh new gas gas add'
replace cap rotor wires.ck for obd codes.Let me know

May 20, 2014 | 1989 Toyota Camry

1 Answer

Car Idles up and down when warmed up


Could be your IAC (Idle Air Control), leaking throttle body base gasket, or a throttle position sensor

Feb 16, 2018 | 1998 Chevrolet Camaro

2 Answers

1998 idles too high at startup when cold SOHC 4.0 ford explorer


Try spraying carb/throttle body cleaner around the throttle body after the truck is warmed up all the way get someone to sit in the truck with it in drive and there foot on the brake if the idle raises there's a vacuum line leaking or your throttle body gasket is leaking if no increase in idle then thoroughly clean out the throttle body with the spray if it's very dirty inside the varnish from the fuel burning is causing the throttle plate to stick or stay open causing your engine to have increased rpms if your using no name brand gas stop now your killing your motor the major brands have detergents in the gas to keep things clean and better mpgs brands like usa Valero speedway delta liberty are all garbage and should only be used in an emergency situation like you're going to run out also if you are using this junk get 2 cans of Berrimans fuel system cleaner and put it in the gas tank every week for a month or so this will clean out the emissions and gas tank of the dirt and varnish from bad cheap gas I say 2 at a time because the super strength is needed to clean out the gunk and keep using it at least 1 can a month with good higher grade fuel 93 octane for about 2 months after then either stay at 93 or go to 91 or 89 not 87 ///// now the reason for the higher octane fuel is this the higher the octane level the slower the fuel burns and cleaner more efficient burning with the cleaner combination to get out the gunk your truck will run much better and mpgs will increase now post back with progress write down everything you've done and we will take it from there if the problem persists but I don't think so I'm a taxi mechanic in nyc.with 50 years experience so that's where the information is coming from and a lot of the cars have 300,000 to 450,000 miles on them so I would say you should listen to this advice they are ford crown Victorias and are original motors good luck stephen

Dec 11, 2017 | 1998 Ford Explorer

1 Answer

Rough idle after truck warms up


clean the throttle body, especially around the butterfly.

Jan 30, 2013 | 1998 Ford Explorer

1 Answer

Car idles up and down when started. No check engine light comes on and once the car is warmed up after started the idle evens out and runs smooth @ 800 rpm


the idle air control valve located on or near throttle body is dirty and sticky you have to remove and clean valve pintle and passages of grease and carbon also clean throttle body and plate use only air intake cleaner and rags that dont leave lint or fluff all parts stores will have proper cleaner

Jan 14, 2011 | 1991 Eagle Talon

1 Answer

Car has a tendecy to surge rpm when at idle or first put into gear seems to stop when engine becomes hot


Quite likely to be idle bypass valve. On older Saabs, this was located in two hoses near the throttle body, but now they are usually integral to the throttle body. A quick and low risk way is to remove the bypass valve (unplug the electrical connector first) and clean it and the seating in the throttle body. Try putting the connector back on, turn ignition on, before replacing the valve in the body. It should move smoothly, if it does, then hopefully, you have a cure, if not, try another clean or buy a replacement. If it does move smoothly it wasn't the idle bypass valve and more diagnosis will be required.

Jul 29, 2009 | Saab 9 5 Cars & Trucks

2 Answers

HIGH IDEL


sometimes the gasket under the trottle body goes bad. spray carb cleaner at the base of the trottle (not down into it) body while the engine is running. if the idle changes your on the right track. its an easy gasket to change.

Jan 08, 2009 | 1998 Chevrolet S-10 Pickup

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