91 ef with b18a1 swap idles at like 3k for 30 seconds, then will drop down to 2500, then will surge from 3k to 750. is it the iacv valve?

 

IACV or map sensor

 

Thanks!

 

http://www.youtube.com/watch?v=yy5RoA5cIJw

idk if it helps any but this is my car surging i cleaned the idle control valve

 

looks like a vac leak sumwhere

 

it may be but i checked all my hoses and there all good

 

The leak is going to be in the intake manifold, throttle body area. This is the type of leak that is not going to be visible. Some have used carburator cleaner to spray over the area and if the idle changes that will point to the leak.

It could still be your IACV if it is bad, cleaning it wont solve the idle

 

i spray carb/choke cleaner in it and it didnt change at all. may have gotten worse.
i might be picking up a map sensor tonight, and if it changes at all i will post.
thanks for everyones help. ill try and pick up a iacv if i can

 

i have iacv it was tested it works fine for sale i got it for 50 bucks shipped shoot me an offer dude if u still need it its like opolished to txt me 814 937 7078 ill send u a pict

 

if i get the map sensor tonight and it doesnt fix it ill deff text you

 

shoot dude i was thinking u had a 91 civic with a d15 srry thats what i had trying to sell parts now man ha

 

Could be iacv or the fast idle thermal valve that is right below the iacv.

 

oh yeah its cool. thanks for helping though. would have gladly bought if it would have worked.

 

so no map sensor problem? guy at autozone said the iacv rarely goes, idk why i trusted him though so.

 

What is the check engine light for?

 

No clue. Bought it with it on.

 

yeahhh should proly check to see what that code is. so your just driving around with a CEL on? the seller didnt tell you why it was on?

 

fast idle timing valve

 

fitv, fast idle thermo valve, I would agree, that's what it sounds like, or a vaccuum leak somewhere. Find your jumper plug, if its a 92-93 b18a1, I don't know if the 91 obd0 works the same as obd1 or like the ef obd0 but you should check for that code...

The fitv is directly below the TB will have one coolant line to and one from going to iacv. You need to take this off and take the cover peice with 2 or 3 screws off and adjust the white threaded peice back into its bore and clean as needed.

I googled "fitv" this was third on the list....if it don't work check all the wiring and vaccuum lines for the engine and get that code and go from there.
https://honda-tech.com/forums/acura-integra-6/%2A%2A%2A-how-%2A%2A%2A-clean-your-fitv-aka-fast-idle-thermo-valve-1564019/

 

The 90-91 ecu for the b18a1 shows the codes on the front of the ecu with no jumper wire like the 88-91 civic does.

 

Check the codes man. Definitely should of been this obvious first option. hah

 

He said it had the cel when he got it...and it idled fine. When the iacv on my zc did this it didn't throw a code, neither did the fitv on my teg had this problem without a code.


Just thought of something.... I had this same problem on my zc after I just got it. I had pulled the trans and changed the clutch and when I put it back together I forgot the coolant sensor plug right under distributor side. Without the input to the controler the iacv couldntr regulate the idle, causing these fluctuations...this thows a code.

 

fast idle thermo valve, for sure man..had it happen to me

its usually on the bottom of throttle body.
pull ur intake (air filtration system) off. and put ur finger over the one of the holes inside the throttle body..one of them should make the car idle down and even out