Hi guys I bought a 94 civic dx a week ago did a test drive no issues has 160xxx miles still starts up and runs fine but has a idle issue that it started 2 days ago. At first start up it idles fine then gets to operating temp still fine. after a drove it starts to idle low it seems. I changed plugs wires cap pcv valve. no cel on.

 

Do a valve adjustment. Valves too tight will cause poor idling especially when hot. Also clean the IACV.

If it idles at a normal rpm (750) but roughly that is different than having a low rpm where it starts to shake and threaten to stall out.

 

Any chance there is a post or steps on how to do that?. I noticed also my temp Guage flactuates up and down below half to half above half back down any help and tutorials would be greatly appreciated. also at what point is the cooling fan supposed to come on. there is coolant. the fan comes on when temp gets well above half

 

Please see FAQs sticky thread to view the service manual procedure.

Also bleed the cooling system.

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