Honda CRX Repair Question
Surging can be caused by many things. One is the level of the coolant in the system. Also make sure that there are no air pockets in the system, use the bleeders to remove any. Given the age of the vehicle, it could be the IAC (idle air control) valve. But yet another possibility is the intake manifold gasket. A small leak there and the engine struggles to maintain an idle, it can also cause the other symptoms.
i have bleeded the system and no air bubbles came out. it could be the iac valve but the car runs great and idles fine. i just dont understand why it only surges after its been running awhile and then i shut the car off and its back to running great for awhile again. it acts almost like something gets too hot and then acts up. could it be the igniter in the distributor? i replace the cap, rotor, and coil thinking the coil might be overheating but it didnt fix it. could the igniter be overheating and causing the ecu to act funny with the fuel curve and timing?
1 question asked
I would look to the intake area. Ignitor or distributor would show different symptoms, for example just turning it off as you said and restarting it tends to clear the problem.
my 95 civic ex is surging too...flush/change coolent no air bubbles comin out...change tps/map/iac sensor...and still does it...cold/hot it dont matter it still surges..and i also unbolted the iac out n block the hole and still does it...i have no ideal now...wat else should i check...
2 questions asked
I have found that the cure for this problem is not always easy. Some people point to the O2 sensor but unless you have a check engine light on that points in that direction it has to be injector/intake related. On that old of a honda I would look at the air intake sensor. It is located across from the throttle cam on the intake. (The cam that the gas pedal cable attaches to) This can stick, I have gotten some WD40 to work into this and fix the problem. However, the sensor is riveted on to the throttle body. I have taken the rivets off with a file and then cleaned the sensor and put it back on with screws and had it work fine too. Otherwise the replacement of the throttle body is necessary.
Don't forget to check all of the vacuum hoses looking for connection, holes, cracks, etc.