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Engine RPM Increase

2000 Ford Explorer XLT (4.0 OHV Engine). When the A/C Compressor kicks on, the Engine RPM's increase by 500+

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This is a normal process. The engines computer knows it has to drive the A/C compressor so it speeds up a little at idle to compensate for the added drag to the engine. This is also to speed the engine up a little to be able to draw more air through the radiator to keep the engine temperature in range.

Posted on Feb 09, 2009

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On a 2000 explorer 4.0 Soho do I have to remove the injectors to remove the lower intake


REMOVE UPER INTAKE 97 EXPLORER V6 4.0 - YouTube

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Putting the lower intake on my 1997 Ford Explorer 4.0 OHV ...

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Putting the lower intake on my 1997 Ford Explorer 4.0 OHV sport .... I do have a 2000 5.0 ... @michaelheiland123654 To dothis job, you have to remove the alternator, unbolt the AC compressor, remove upper intake manifold, remove fuel rail,remove all injectors, ... Do you have the SOHC or OHV version?

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Dec 09, 2015 | Cars & Trucks

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In my 2000 ford expedition my temp gauge keep jumping back and fourth when I run my ac. Y?


Running the AC does increase load on the engine, and thus heating, so if gauge changes gradually, this is because the compressor kicks in for a while, then kicks out. If cooling system is not working properly, small additional load could cause temp change. Other possibility is compressor going bad and causing excess drag.

If change is sudden, loose wire somewhere near compressor could be the issue.

Jun 08, 2015 | 2000 Ford Expedition

1 Answer

Why does the rpm increase on a 98' ford explorer while traveling at a steady speed of 60 miles per hour when it used to be lower ?


Failed Transmission

It is slipping

Has to be rebuilt

Used it-- when you know it
had problems & ruined it

Aug 15, 2014 | 1998 Ford Explorer

1 Answer

Whenever I turned on the air condition in my Ford Explorer 2006, after few second the radiator Fan start running very frequently on high speed making noise. When the fan starts on high the rpm of the...


The cooling fan is supposed to come on when the /ac compressor clutch cycles on, and off when it cycles off.
The idle speed kicks up to compensate for the additional a/c compressor load and the additional alternator load. usually, just the low speed comes on until it hits a much higher temperature.

the system should cycle 4 to 7 times/minute at 79 degrees F.

Here are some things to consider:(The PCM (engine computer) is NEVER defective, don't replace it). I don't think it is the ECT (engine coolant temp sensor) or the Cylinder Head Temp Sensor. Or the VSS or the MAF sensors.


The electronically controlled fan clutch is controlled by the powertrain control module (PCM) based upon requests for airflow to cool the engine, transmission and A/C condenser. If no cooling is required, the electronics permit the fan to spin at a slower speed yielding improved fuel economy.
-------------------------------------------------------------------------------------------------------------------------------
Inoperative or damaged:
  • Electronically actuated fan clutch
  • Electronically actuated fan clutch controller
  • Wiring, connectors, relays or modules
  • Engine Coolant Temperature (ECT) sensor (4.0L SOHC)
  • Cylinder Head Temperature (CHT) sensor (4.6L [3V])
  • Mass Air Flow (MAF) sensor
  • Vehicle Speed Sensor (VSS)
  • ----------------------------------------------------------------------------
If the cause is not visually evident, connect the scan tool to the Data Link Connector (DLC).
Retrieve any DTC Codes (Diagnostic Test Code). Autozone will do for free.

--------------------------------------------------------------

The cooling fan clutch actuator valve controls the fluid flow from the reservoir into the working chamber. Once viscous fluid is in the working chamber, shearing of the fluid results in fan rotation.

The cooling fan clutch actuator valve is activated with a pulse width modulated (PWM) output signal from the powertrain control module (PCM). By opening and closing the fluid port valve, the PCM can control the cooling fan clutch speed. The cooling fan clutch speed is measured by a Hall-effect sensor and is monitored by the PCM during closed loop operation.

The PCM optimizes fan speed based on engine coolant temperature (ECT), engine oil temperature (EOT), transmission fluid temperature (TFT), intake air temperature (IAT), or air conditioning requirements. When an increased demand for fan speed is requested for vehicle cooling, the PCM monitors the fan speed through the Hall-effect sensor. If a fan speed increase is required, the PCM outputs the PWM signal to the fluid port, providing the required fan speed increase.

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May 20, 2011 | 2006 Ford Explorer

1 Answer

I have a 1999 jeep cherokee that has intermitant transmission problems 1)shifting up it wind out to 2k-3k before shifting 2) at higher speed it feels as if it slips out of overdrive rpm increase but speed...


It will shift out of overdrive upon increasing throttle , pulling hills and so on. Your overdrive probably kicks in around 35 to 45mph and kicks back out as you increase throttle. Electrically controled speed sensor to control the response. Overwise the engine would bog down to a stall. Over drive is just that. It changes the gearing ratio to over drive meaning less then final gear 4 to 1 down to 4 to 3 etc more direct drive ratio to lessen consumtion of fuel with less stress on engine. Have shift speed sensor adjusted. Don't drive in overdrive in city if most driving is under 45mph

Mar 09, 2010 | 1999 Jeep Cherokee

1 Answer

If i start the car and then start air conditioner the rpm is not automatic increase but decrease what i do?


the rpm will first drop because of the compressor clutch engaging. it should normally drop and then return to normal idle once the computer compensates for the compressor kicking on.

Jul 08, 2009 | 1996 Honda Civic

1 Answer

Sporatic rpm increase at 2000 rpm (increases to 4000 by itself)


change tranny fluid with mercon v also can add friction modifier (ford part# m-19546-a) and be sure to drain torque converter as well. should fix ya

Apr 14, 2009 | Lincoln Mark VIII Cars & Trucks

1 Answer

Problem with engine rev. when turning the aircon


Hi,

In most cases, when the A/C compressor is activated, there is likewise a solenoid that is activated. This solenoid is mechanically couple to the throttle and basically increases the idling RPM . This is to compensate for the additional load that the A/C compressor puts on the engine. If this solenoid is defective or the connector detached, then it will not compensate when compressor is active. Then your idle goes down and the probability of a stall increases.

Slight increase in temperature as compared to other vehicles maybe due to:
1. improper mix of water and coolant;
2. defective or delayed opening thermostat;
3. clogged radiator tubing;
4. leak in the engine cooling system;
5. engine using higher octane fuel or improper oil;
5. engine in need of a major tune-up.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Jul 16, 2008 | 2000 Suzuki Vitara

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