ive been noticing that my car's idle goes to 2000 rpm every morning but then it goes down after like 2 minutes of leaving it running. i check all the vacuum hoses and they're all fine. it only really does it when its cold but it idles fine after its been warmed up. i think my temp sensor on the head might of gone bad. any ideas of what it might be?

 

bad IAC valve

 

is this for carburated or fuel injected models?

 

Sounds like the motor is just warming up.

 

Hondas idle high until they are warm then they will idle down. Its best to let it fully warm up before you drive it.

 

**** mine does the same thing but at 3000. it's really annoying, i was thinking cus i have a cheap *** OBX free flow cat on it. but thats my deal. I'd also like to know why mine is doing this. i have 1990 LS motor in it btw.

 

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

X2 Agreed

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ltsmith05 &raquo;</TD></TR><TR><TD CLASS="quote">Sounds like the motor is just warming up.</TD></TR></TABLE>

same happens to me, but I just think of it as the engine warming up, and the idle goes lower as the temp rises

 

2k is normal, 3k is not.

 

yes it is very loud, obnoxious and i'm just ditching the motor anyway.

 

2000rpm is pretty normal on pmgfi cars. (especially in cold climates/winter months etc)

my hondas have always started at around 2000-1700 rpm, stayed there for about 30 seconds then slowly brought them selves to idle. basicly your fitv valve is open and as the coolant temp raises the valve begins to close lowering your idle.

3000 rpm is NOT normal though

 

mine does same thing on start up idles at 2k then slowly goes down as it warms up.

 

hello. My name is Christopher Maynard. Btw I’m deaf.. I need some ur help. It’s normal 2k rpm idle when cold start Honda Crx Si 1986.. when car was cold 2k rpm idle after was warming up drop 600-700rpm.. its would fine? Let me know please.. comment