1995 P30 7.4L IDLE HI 1200 RPM SHOULD BE 850 RPM

check ICS for correct operation
engine idle speed is 850 -950 rpms for auto and 750-850 for manual
at 1200 rpms you are not on the idle circuits but on power circuits
run the fault codes

concerned about nothing
the ECM sets the high idle rpm on starting so that there is sufficient air / fuel mixture to keep the engine running while it does a tune up and checks all the sensors
when the sensors are all reporting within parameters , the idle speed will drop back
should settle at around 850-900 rpm
as for the fan noise
if you have a viscous fan hub( not electric ) that is the fan locked in high temperature mode and will stay there until the liquid silicon is pumped back into the reservoir
usually takes about 1 minutes and indicates a properly operating fan
as the silicon is being pumped back the fan rpm slows down with a reduction of fan noise
If anything raises your concerns , you have an on board fault recording system that you can access at any time using a scan tool
get in the habit of having the fault codes read at each service or when you feel something is wrong as it will save you lots and lots of cash by not guessing repairs

Hi, Check the a/c diaphragm idle up! Must be the vacuum line is disconnected or there is a leak in the hose, and the diaphragm itself is not working anymore! Maybe needs adjustment!
hope that helps u out!

IDLE AIR CONTROL VALVE IDLE SPEED TOO LOW. IDLE SPEED SHOULD BE 750 - 850 RPM. IDLE SPEED NEED TO BE CORRECT OR IT WILL CAUSE ENGINE RUN ROUGH OR STALL OUT.AC COMPRESSOR WILL TAKE SOME POWER FROM ENGINE WHEN AC IS OPERATING.

correct ignition timing should be at 10 degrees btdc at idle ( 850 rpms )
use a timing light connected to no 1 piston ht lead to set the timingby adjusting the distributor to get the light to flash on the timing mark
the vacuum hose is probably to increase idle speed when then ac is on and the surginging indicates a leak in a diaphragm

Hi, at the front of the crankshaft. if its near time for the timing belt, you want to replace it along with any pullies, tensioner and water pump


The crankshaft position sensor is mounted on the engine near the crankshaft.

Operation

The crankshaft position sensor is a Hall-Effect sensor that senses the crank angle (piston position) of each cylinder and converts it into a pulse signal. The signal from the sensor is relayed to the ECM to indicate engine rpm and the position of the crankshaft.

Removal & Installation

1. Disconnect the negative battery cable.
2. Disconnect the connector from the sensor.
3. Remove the bolt that retains the sensor in place.
4. Remove the sensor from its mounting. To install:
   
   1. Installation is the reverse of the removal procedure.
   2. Clearance between the sensor and the sensor wheel should be 0.020-0.059 inch. 2002-2005
      
      1. Properly connect the scan tool.
      2. Start the engine and allow it to idle.
      3. Be sure the idle position switch is ON.
      4. Specifications are as follows:
         
         Temperature - 4°F, test specification 1500-1700 RPM Temperature 32°F, test specification 1350-1550 RPM Temperature 68°F, test specification 1200-1400 RPMTemperature 104°F, test specification 1000-1200 RPM Temperature 176°F, test specification 650-850 RPM

Idle Speed Control (ISC) Motor OPERATION Eagle Throttle Body Fuel Injection (TBI) System NOTE: The Eagle TBI system is used only on 2.5L Premier engines. The Idle Speed Control (ISC) motor is mounted to the throttle body and controlled by the PCM. The throttle lever rests against the initial adjustment screw of the actuator (plunger). The idle speed is not adjustable. The initial adjustment screw is only used to establish the initial positioning of the actuator when the ISC motor has been replaced. The actuator extends or retracts to control engine idle speed and to set throttle stop angle during deceleration. Based on inputs from the various engine control system sensors and switches to the PCM supplies current to the ISC motor to adjust the actuator position for the particular operating conditions.
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your idle should be around 750 to 850 in park or neutral
i don't know how it even runs at the rpm you listed.
your vehicle should have a tps sensor
"throttle positioning sensor" you might have to have it reset

your EGR valve is malfunctioning

Hi the idler valve has a set up with jag equpment but there is a way round this,ifyou have had  O2 sensors changed, is the idler working what are the revs when hot. 650 is to low  850 is ok with a hot engine Mike do you know where the idle valve is and the allen key manual adjustment try a quarter turn but mark it so you can turn it back if need be. let me know how it goes   D