psyonicdeath

So Im new to civics, got one a week ago and only have 1 concern. I did a search and couldnt come up with the exact answer so I'd appreciate a bit of help. The car is a 97DX with 100k miles.

Whenever the car is idling about 75% of the time it idles smooth but when i bring the revs up and let them drop down it gets rough for a few seconds then it comes back up to normal idling. If im stuck in traffic the engine idles rough and i feel vibrations in the car but then always goes back to normal and then rough sometimes again.

psyonicdeath

Also when accelerating or decelerating I feel like the car has no problems and the car has no Engine check light so im figuring this is a small easy fix just looking to get it out of the way.

psyonicdeath

One more thing I noticed is that when it is idling it idles at 1000 rpm and drops to about 850-900 then jumps back up again so Im pretty sure that should help pinpoint the problem. I installed an autogage tachometer i thought it was the tachometer but I dont think it is now after reading that other people also idle at 1000...

94sohcVTEC

few simple things i'd check or do are
clean the fuel injectors - fuel additive
distributor - cap, rotor
spark plugs, plug wires
timing - belts, TDC marks


Modified by 94sohcVTEC at 4:10 PM 7/1/2005

O16581724 5 2 5

Check for vacuum leaks.

b18c5 EG

mine did the same thing....the timing was off a tooth..by the way search there are 100's of threads about this

92LXCivicAccord

I'm with vacuum leaks on this one.

Han Solo

This may seem kind of obvious possiblity, but check the idle control valve.