this just started to happen this morning, when im driving the car it seemed to be fine but when im at a stop the rpms stick at around 4k(rpm) and my ecu is chipped with a 3.5k rev limiter(chip made be xencron, so its a good chip) and if i throw the car in nuetral the rpm's will climb and stick at 4k.....now why would that happen??

the car is a 91 civic ef i have a dohc zc with a t-25 turbo and the ecu is a pr4 chipped(chip made be xencron) ive this set-up for a while(since jan.) and this just started today.

 

check all your vac lines, one could have poped off

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hella_JDM &raquo;</TD></TR><TR><TD CLASS="quote">check all your vac lines, one could have poped off</TD></TR></TABLE> ok thanks....but why would that cause the rpm's to rise????

 

when my bov got disconnected it didnt make the surging idle like a typical vacuum leak , the rpms just stayed up....did you change anything on the car right before you noticed this?

 

yeah check your vacuum lines, it would cause the RPMs to surge up because u now have a new opening to the intake manifold. I know if that big PCV line comes off the middle of my intake manifold on my teg, the RPMs will rise around that high.