i have a 94 ex replaced the iac sensor and the car is still surging between 1000 and 1500..but the weird thing is it only does it sometimes.. wen its not surging its idling at 1500 if i unpluf the iac sensor and put my hand orver the hole in the tb for the iac sensor the the vacuum goes away dont know wats causing this can any one help.

 

Have you checked/cleaned your FITV? That can cause it too. Also air pockets in coolant.

Get that all straightened up, then set the base idle &go through the idle re-learning procedure.

Can you notget the base idle (with IACV unplugged) down to 550 or so?

 

To add to the above post;
Also be sure there is a little slack in the throttle cable.

IAC sensor??

 

Try this...
https://www.hondaaccordforum.com/m.a...page=1&key=

 

does it only surge when the engine is cold? if so i would geuss fitv.

 

The fitv is good ccloses wen its suppose to.. I bleed the system .. It won't go below 1000 with the iac unplugged.. Does any one know if the if a bad coolant sensor for the comp would cause this and which one is it exactly the one all the way in the front

 

Coolant sensor can cause high idle, but it does that by operating the IACV (which you unplugged). Check for vacuum leaks & verify the actual throttle closes all the way.

Theres 4 temperature sensors.

2-wire fan switch in thermostat housing (follow lower radiator hose back towards firewall).

another 2-wire fan switch in the nozzle for the upper radiator hose. Not in the actual head.

A 1-wire sensorin end of head, below/forward from distributor. This one is for the dashboard temperature gauge.

Nearby, the one you want is a 2-wire sensor in the actual head.