ever since it started gettin cold out ive had a couple random problems start occuring.... ifs its cold than 30 degrees out my heater takes forever to get warm somedays it doesnt even start to work, if i floor it every where i go itll get warm if i stop and sit like out side the gas station with the car running it goes cold ive tried blowing out my core replaced the thermostat not sure what it is then today as i would let off the gas no matter how high the rpms they would drop back down to around 700 in a matter of a second as i slightly would step back on the gas it the rpms would bounce from 700 to 1200 like i had launch control any solutions would be great its a 96 civic ex ej9 automatic tranny

 

and there are no cels

 

Heater issues - Is the temp gauge on your dash moving from the "C"? Is the lower radiator hose getting warm after driving it? If the car is in fact cold, do not floor it everywhere. It can do damage to the motor/transmission.

What kind of thermostat did you install? OEM Honda?

RPM issue - So you are driving and the car cuts out and drops to 700 rpms, then surges between 7-1200? Am I understanding this correctly? Does this happen only after driving the car, or right when it is started?

 

ya the gauge sits just below half way between cold and hot the thermostat is the oem one from oriellys the idle problem was right after i started it and drove it cuts out as soon as i let off the gas the surges only if i slighty push the gas i drove about a quarter of a mile shut it off for about two minutes then started it again and it stopped

 

Once warmed up, the gauge should stay at halfway under all driving conditions. Really the only reason it would drop down again after warming up is that the thermostat is stuck open.

Idle rpm is programmed to be affected by engine temperature.

 

If that's the case, I'm thinking there's a big air bubble in the cooling system. If the heat is working sporatically, it's probably because the air bubble is in the heater core, so no hot coolant can be run through the blower. Then when the air gets to one of the temp sensors, the ECU is reading the sensor which is now at a different temp because of the air, and is adjusting idle (and probably engine timing) to compensate.

Long story short, bleed the cooling system, add proper 50/50 coolant, and see if it runs better.

 

OEM Honda is just that.... OEM. No matter what brand tstat you have it will be labeled as OEM as there is nothing else you can fit in there. If you did not buy it from a Honda dealership, or a Honda parts dealer, then it is not OEM Honda. I swear by Honda tstats and nothing else

Pull the tstat out the vehicle, drop it in a pot of water, turn the heat on. Watch the tstat open. Turn off the heat source and watch it close. Does it close all the way? Regardless, I suggest to buy a replacement Tstat from Honda. I have heard and seen too many generic tstats fail upon first installation.

If you have air in the heater core, it would be "pushed" out as soon as you turn the heat on/cycle hot coolant through. The air bubble would make it way into coolant system within the engine bay and show signs of overheating. Not the opposite.

 

thanks guys for the advice i'll give that stuff a try can i burp the coolant system to get the air out of the heater core

 

There is a recommended way to bleed your cooling system, My experience is that if you don't use that way you have problems. When all else fails follow the direction.