ok i was in my moms car today and her car is idleing very rough. its a 1991 honda civic dx 2dr.

 

idle rough as in going up and down alot?


if so clean the iacv

idle
air
control
valve

its a common issue and a result of carbon build up.

here is a howto link and its pictures of 96 and up civic but is the same thing.

http://www.team-integra.net/sections...ArticleID=1174

 

thanks very much

 

On the DPFI system found in the 91 DX, the IACV is mounted on top of the intake manifold on the cylinder #1 side. Otherwise the process is the same.

 

Also, have you inspected the plugs, wires, cap, and rotor?

Any CEL codes?

 

thanks for your help