When I'm cruising or accelerating lightly, once the RPMs hit about 2000, the engine starts surging up and down from 1900 to 2100 RPM. If I give it more throttle or downshift it runs smooth as long as I'm not within that RPM range. I've done all the normal tune up stuff. In fact, I've had this same problem before and after an engine swap. Any suggestions?

93 Civic w/SOHC Vtec

 

fitv

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by eg6T &raquo;</TD></TR><TR><TD CLASS="quote">fitv</TD></TR></TABLE>

that or, a vacum leak.

Phil

 

Oh. I bypassed the FITV. Does this mean that I have to put it back?

 

doesnt sound like a FITV to me......spray some carb cleaner on all of the vacuum lines/Intake manifold. See if it stops revving. The carb cleaner if sucked in will richen the mixture temporarily and stop it from revving.

 

it was revving like that for me..it was my fitv

 

It's not doing it at idle. It idles perfectly. Besides, when the coolant warms up, the FITV closes, but my problem happens hot or cold.

 

that why its not your fitv, cause that only effect idle.

BTW, your fitv a loose fitv will not always stop when the car warms up. If its unscrewed enough it will do it all the time. Mine did it for about a month until it was all the time.

 

i didnt say it was doing that for me at idle,it did it at idle and when it was warmed up,i fixed the fitv,and it stopped.im not saying that it IS your fitv,im just saying thats what it was with me,at idle and warmed up