runs fine but when I stop idle drops way low and car dies sometimes. Is it the IACV? No codes, car is stock, timing is correct. No vacuum leaks. ek hatch. Only has 72k miles. D16y7 engine, new plugs, air filter, fuel filter, cleaned MAFS, and throttle plate.
Any ideas??

 

You answered your own question. More than likely its the iacv.

 

adjust your idle set screw. It is on your throttle body, up top. (flat head), just make sure not to strip it, as they epoxy it in, and it is very tight...

vaccume leak would cause car to idle too high.

Also, IACV could be your culprit... as it regulates air coming into the engine when throttle plate is closed.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by stinkyfeet &raquo;</TD></TR><TR><TD CLASS="quote">adjust your idle set screw. It is on your throttle body, up top. (flat head), just make sure not to strip it, as they epoxy it in, and it is very tight...

vaccume leak would cause car to idle too high.

Also, IACV could be your culprit... as it regulates air coming into the engine when throttle plate is closed.</TD></TR></TABLE>

the op said his idle was low, not high. and i wouldn'y suggest adjusting the idle screw. that is not the proper way to correct the situation. actually, you should never touch that screw to begin with.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vrrodri &raquo;</TD></TR><TR><TD CLASS="quote">runs fine but when I stop idle drops way low and car dies sometimes. Is it the IACV? No codes, car is stock, timing is correct. No vacuum leaks. ek hatch. Only has 72k miles. D16y7 engine, new plugs, air filter, fuel filter, cleaned MAFS, and throttle plate.
Any ideas??</TD></TR></TABLE>

before you start taking stuff apart and buying costly parts, why don't you replace the pcv valve. they run about $3 at the store and 95% of the time is the culprit.