bouncing revs!!!!
 

hi guys. im new to this website, and to civics. i bought a civic coupe 1998 about a month ago and since ive got it the revs go up and down continuously at idle when warm. ive been opn a few trouble shooting sites and these said to replace either the MAP sensor or the TP sensor. ive done both and no luck. also another wierd thing is that i inplugged the map sensor and it stopped, i unplugged the tp sensor and it stopped, i also unplugged the injector sensors 1 by 1 and it stopped every time. has anyone come across this problem before?
thanks. brendan.
p.s sorry 4 the essay!!!

RE: bouncing revs!!!!
 

You may have a vacum leak some where. Also, try adjusting the idle via ICV on the throttle body.

RE: bouncing revs!!!!
 

also check the idle air control valve on the back end of the intake manifold. those things get clogged up. are you getting a check engine light?

RE: bouncing revs!!!!
 

thanks for those tips, ill check them out. no, no engine light either. thanks again.

RE: bouncing revs!!!!
 

i have the same problem my local speed shop said it was the iac so i went to the junk yard got 1 n cleaned it up still had the same problem. i went to honda n got 1 brand new n i still go the same problem. i loosened the hex screw in the end n now its not that bad but i don kno wat else to do.

RE: bouncing revs!!!!
 

check your throttle cable, free movement, etc, and that its not over tensioned, when the throttle is closed there should be a little slack iof its tight at all it cunfuses the ecu and sensors, if thats not it, try cleaning your injectors next...