i have a 93 civic dx coupe with a 1.5 stock engine. the cars idle goes up and down by its self i checked for vaccum leaks and i dont think theres any. what can it be? also 2 hoses are loose. one from the evap control canister and one close to the thermostat housing

 

https://honda-tech.com/forums/honda-civic-del-sol-1992-2000-1/92-civic-hunting-high-idle-problem-3008033/

 

Any CEL?? i just had this problem and it was my IAC valve. I cleaned it but it didnt help, so i had to get a new one. But you can clean the throttle body and make sure all sure all the sensors are plugged in.

 

Start by clicking the IACV and FITV links in my signature.

 

Whars a CEL

 

C=Check. E=Engine. L=Light.

 

Yes

 

Pull the CEL code.
Read this link on how to do it and read it.
https://honda-tech.com/forums/honda-civic-del-sol-1992-2000-1/how-pull-cel-d4-srs-abs-codes-code-lists-1901557/

 

Check for a vacuum leak?? Mine threw a cel for IACV and I replaced that, idled good for a couple hours, then back to bad idling so I checked for vacuum leak and sure enough as simple as taking pliers and closing a few hoses I found the problem in about 2 minutes. Check all the hoses that have are connected to air intake and engine. Hope this helps.

 

so i cleaned out my IACV and the O-ring ripped.. went to Autozone but did not carry the right size O-ring i needed.. does anyone know where i can get a replacement?

 

simple way to check it is ,switch off the car and remove the wire plug from IACV and start the engine ,see the different if the problem cleared, its the IACV remove it and clean it and fix back the wire plug and check ,if still having the trouble remove the inlet horse and start the engine and cover the throttle body hole by palm of your hand see engine stop suddenly ,beware for the safety when doing this ,if the engine suddenly stops there is no vacuum,if engine stops slowly there is a vacuum leak then find it and fix it some times may be gasket of throttle body, and even problem having check the throttle body gate probably it may wear out then replace it .... replacing used one not recommended....