I have a problem with a D15 engine the rev keep going up and down could u give me idea whats going on with it

 

try to clean out the iacv on the back of the intake manifold it's a little black thing with 2 bolts or so holding it on take the bolts off and spray some carb cleaner on the screen

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by primeredbeast &raquo;</TD></TR><TR><TD CLASS="quote">try to clean out the iacv on the back of the intake manifold it's a little black thing with 2 bolts or so holding it on take the bolts off and spray some carb cleaner on the screen</TD></TR></TABLE>

also it could be the fitv, vacuum leaks, air bubbles in your coolant

 

what is FITV could u explain where it is located and what is the perpose of it

 

fitv=fast idle thermo valve

its directly underneath your throttlebody with the coolant lines running thru it.

its purpose is to sense the temperature of the coolant and adjust the idle accordingly

 

Thanks much for the help people