ok, when my motor is cold and i start it up for the first 4-5 minutes the IDLE bounses around between 1,000-1,500, ONLY FOR 4-5 minutes, once it gets a bit warmer it idles fine,


WHAT COULD IT BE ??

iacv sensor ??

throttel gasket or manifold ??

 

IACV.
what year/model is your car?

 

motor is brand new, d16a6 block and d16z6 head, in a 1994 civic vx, so its on the z6 im,


but would the iacv be it even tho the idle goe sback to normal when it get warmer ??


could i un-bolt and spray some carb cleaner in it ?

 

well your engine isnt brand new cuz its a 92-95 engine.
and the IACV is the main problem on cars that the idle goes up and down when its cold. then returns to normal idle when the engine warms up.
and yes. you can remove it, take it apart and clean it with brake/ carb cleaner.
there is a very nice DIY some where here on h-t

 

brand new block FROM HONDA, all new internals, some oem some aftermarket, sae goes with head,

i call that brand spanking new brother,


thanks for info by the way !

 

so your block has NEVER been used. NOT once? even though its MORE than a decade old?
w/e.
and new pistons, cam, cam gears, valve train, valves, valve springs, etc doesnt make the engine new.
new is FRESHLY forged. with 0 miles on EVERYTHING. including the bare block.
but ok.

good luck

 

u can buy a BRAND NEW ORGINAL BLOCK from honda dealer u know..

 

https://honda-tech.com/forums/acura-integra-6/%2A%2A%2Ahow-clean%2A%2A%2A-your-iacv-k-idle-air-control-valve-1575913/

 

ok do i have to un plg and hoses , or can i just un-bolt and spray cleaner ?? as it was cleaned before install 200 miles ago ?

 

you can clean it with out removing anything. just the iacv. but it will be slightly harder. im trying to locate a thread here on how to COMPLETELY clean the iacv by removing all parts and cleaning from top to bottom but im having no luck

 

oh its ok bro, i allready thanks for the help, but i wasent sure if its the iacv because when 4-5 minutes past and warmed up a bit it would go away, but yeah thats whay i will do and c the reslts.

throught that sensor coolant passes, and i drained and re filled my coolant, and mabey some dirt got in, so yeah. thanks again TK

 

like i said. MOST of the time, about 80% of the time, if the idle "revs" up and down its normally thr iacv

 

well, there wasent enough coolant in system so that was problem, i figured not the sensor becaus eits brand new from honda 200 miles ago, lol thanks for help

 

its either that or the FITV. But you can clean out the IACV instead of replacing it.
And @ Unseen Racer, you can buy brand new blocks and heads from Honda. They dont pull them out of cars, they are brand new. I'm not sure if they still have some left over from like a decade ago (probably not), but they probably still forge them because of all the civics on the road there has to be some demand for new engines. I have a new Z6 head in my car, I got it from a kid who bought it from Honda brand new, put it in his car and then crashed it the next day.