CTR-GSR

also has rough idle.. any thoughts?

Thanks.

CTR-GSR

bump?

ddd4114

It's pretty tough to give advice when we have no idea of what the engine is nor what's done to it.

CTR-GSR

Sorry.

97 JDM B18C, Internals are stock, CAI. Plugs, Cap, Rotor changed last summer.
Maybe moisture problem? It happened the day after we had some rain.

SOHC_4dr

possible. take off your filter and dry it. do you have a by-pass for your CAI?

ddd4114

If you started noticing it after it rained, that seems likely. Try testing your ignition coil.

Have you looked at your spark plugs?

CTR-GSR

No by-passs, will check ignition coil/plugs this afternoon.

Thanks for suggestions.

CTR-GSR

So I haven't got to testing the coil/plugs yet. Some more things I have noticed though...

-The car doesn't seem to bog/hesistate under acceleration until it reaches operating temperature.
-Coming to stop after the car has warmed up will cause the idle to drop 2-400 below where it is set to be. It will continue to fluctuate until occasionally it will kick up by itself.

Thoughts?

Former User

Problems associated with moisture often point to bad plug wires. I also noticed that you didn't replace them when you did a tune up.

nothing_shocking

could be a vacuum leak somewhere

cashkeith

vacuum leak

mistajdm

my boy has the same problem with his b20vtec.

ddd4114

If it's idling too low when it's warm, I doubt that it's a vacuum leak.

If it's fine when in open loop, it's most likely something like an oxygen sensor that provides feedback and affects the mixture enrichment in closed loop.

Maverick

try a compression test and see if its where it needs to be. check all cylinders for misfires too.