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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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

Vibrations during idling


which engine.??? never post lacking engine ,here is why.
1.3 L G13B I4
1.5 L G15A I4
1.6 L G16B I4
1.8 L J18A I4
1.8 L BP-ZE I4
1.9 L XUD9 diesel I4

Ill answer in the generic and for GAS engines. only.
that is illegal RPM, the ECU regulates it to 800 all the time
that means the ECU can not regulate the RPM now, for many reasons.
and sure it vibrates too low, that is normal for all 4cylinders to do that.
no bad engine mounts never lower RPM to 600, ever.
they dont control idle speed at all.
the #1 reason for most cars to idle too low are:
1: EGR leaks, (clean it)
2: ISC stuck closed (electric idle speed acututor dirty) clean it.
3: gross misfiring , caused by bad spark or bad fuel mix.
4: low compression on 1 or more cylinders (real low) Do compression test at WOT. throttle.



Apr 19, 2014 | 1997 Suzuki Baleno

1 Answer

Rough idle after truck warms up


clean the throttle body, especially around the butterfly.

Jan 30, 2013 | 1998 Ford Explorer

1 Answer

When idleing once in a while it starts running rough and shaking truck, 1998 k1500 350. no engine light. when i gige it gas it smooths right out. engine seems like its a little louder than normal.


Here is the common cause of surges, cold stalls, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours.

To correct this problem Buy a can of throttle valve cleaner (it is made by CRC) from the local auto parts store, NEVER USE CARB CLEANING SPRAY, IT DESTROYS THE ANTI-STICK TEFLON COATING, spray it into the air intake through the throttle body of the engine until you have used about half the can, you will need to hold the idle up while you do this, it will try to stall, after this shut the engine down and disconnect the Negative (-) battery cable for 5 minutes. The intake is now clean, if you continue to have the idle speed control problems you may need to seek the help of a professional.

Feb 13, 2012 | 1998 Chevrolet K1500

1 Answer

Car starts great after it warms up and turn it off and start it again it idle up and down for a while then it levels out smooth


remove and clean the idle air control ( IAC ). it controls idleing on vehicles now days. it gets a carbon build up inside and starts to stick. also clean good where it mounts to throttle body.

Aug 17, 2011 | Pontiac Grand Prix Cars & Trucks

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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