1994 Honda Civic DX I Replaced Idle Air Control Valve Because Idle Was Jumping Up And Down The New Valve Jumps And Down To And when i Disconnect The Valve Car Idles Fine ?

SOURCE: 94 civic erratic idle when warm

either low coolant or your IAC motor is acting up

SOURCE: How to change upper control arm on 1996 Honda Civic DX ?

UPPER CONTROL ARM:

Do not disassemble the upper arm. If the ball joint or bushings are faulty, or the upper arm is damaged, the entire upper arm must be replaced.

1. Raise and support the vehicle safely.
2. Remove the front wheels. Support the lower control arm assembly with a floor jack.
3. Separate the upper ball joint from the steering knuckle using a ball joint separator tool.
4. Remove the self-locking nuts from the upper arm anchor bolts. Remove the upper arm from the vehicle.

1. Install the upper control arm assembly into the strut tower.
2. Connect the upper ball joint.
3. Install the front wheels and lower the vehicle.
4. With all four of the vehicle's wheels on the ground, torque the upper control arm nuts to 47 ft. lbs. (65 Nm). Torque the castle nut to 32 ft. lbs. (44 Nm); then, only tighten it enough to install a new cotter pin.
5. Tighten the wheel nuts to 80 ft. lbs. (110 Nm).
6. Check and adjust the vehicle's front end alignment.

1. Remove the lower control arm that is in need of new bushings.
   

1. Set up the control arm in a press.
2. Using a impact socket of the correct length and size, press out the old bushing.
3. Install the new bushing by slowly using the press to push it into the control arm.
4. WARNINGExcessive force could cause the bushing to bend or tear so be careful.
5. Once the bushing is properly seated in the control arm, remove the arm from the press and install it on the vehicle.

SOURCE: idles up and down after warm up

THE COOLANT LEVEL IS LOW

on the older hondas even the newer ones idle speed is coolant temp controlled.

when the engine idles up the electronic coolant temp sensor is submerged in coolant and reads warm, so the engine computer idles the car down. the coolant level if low than drops from around the coolant temp sensor and it says the engine is cold, so the engine computer idles the car up.

which results in the constant rise and fall in engine rpm.

ADD COOLANT TO THE RADIATOR AND WATCH THE CAR MAGICALLY FIX ITSELF.

Marvin

• 85242 Answers
• Posted on Apr 16, 2009

SOURCE: Poor Idle, dies at stopsigns

I have used this fix for your problem for 20 years.
Here are some of the causes of surges, 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, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

copywrited 2008

SOURCE: 2003 Honda Civic runs hot when idling.

Check the cooling fan switch. It appears your auxiliary electric cooling fan isn't going on when at idle. and engine temp increases. While you are driving, air is being rammed thru your radiator as you cruise along, so it isn't overheating, at idle, that isn't happening, and the fan should go on as the temp goes up. When the ac is switched on, the fan is being signaled to operate due to the heavy ac load on the cooling system.