*** Identifying IM Sensors.. *PIC*
 

ok now.. I have an 88 Si, stock IM.

I recently purchased a complete 90 CRX Si IM. with all sensors, ,TB etc attached.
My question is that I see different things, sensors etc between the two.

1.
88 Si: has a dashpot diaphram on the TB w/ a vac hose to it from the IM and one out of it to a sensor on the Firewall.
90 Si: has only 1 vac hose from the IM to the diaphram on the TB
2.
88 Si: on the back of the IM, drivers side there is a flat spot that is not drilled / tapped.
90 Si: Same spot, drilled/tapped and has a sensor w/ a 2p connector and a 1/2" ID Hose from it to the back of the IM near EACV.
3.
88 Si: on back driver side. two stamps. one says PM - 6 the other says HF - 3
90 Si: same location stamped PM - 6 and HF - 5

anyone help identify? and will that TB work on my 88 ? Im sure I can just leave the sensor on the back of the IM disconnected but would still like to know wtf it is.

thanks
-mike

Re:*** Identifying IM Sensors..
 

so is the sensor coming out of the tb does it go to the sensor beside the map,the sensor on the flat spot i think it is like the fast idle air control valve or something like that its one that is not used in a mpfi swap, try a tb from a integra that had the d16a1 in it

Re:*** Identifying IM Sensors..
 

...there should be a big red hose going to the canister off the top of the tb and a littler one on going to the purge cut off selinoid(the one beside the map) i think thats the best i can tell :-\

Re:*** Identifying IM Sensors..
 

nope! haha it's really weird..

ok.. theres like a throttle cushion diaphram near the throttle cable. it has a vac hose running to the IM. then it has another running from it to a sensor on the fire wall. there are 3 on my 88si's fire wall...

I'll see if i can get pics tonight..

Re:*** Identifying IM Sensors..
 

ok.. the picture itself is exactly what is on my 88 si

red circle = new IM has the port facing the FPR but not the one facing the dist.

green circle = new IM has a sensor here w/ 2p connector and large vac line going to back of IM near the EACV.

http://images.cardomain.com/member_i...43_43_full.jpg

Re:*** Identifying IM Sensors.. *PIC*
 

hrmmmmmmm........ i'm thinking that the 90 i.m. was from an auto., when i got my new b18b, it came from an auto and had an extra sensor with a vacuum line going to it on the i.m., i just took the sensor off and made a block off plate for it and it was fine, i still don't know exactly what the sensor was, but i know it was for the auto tranny. as far as everything else, as long as all the vacuum nipples are plugged and everything with a vacuum hose goes to a vacuum source, you should be fine, i wasn't too specific one mine, they were a lot different on the new engine/i.m., i just hooked them all up the best i could and it worked fine.

Re:*** Identifying IM Sensors.. *PIC*
 

on the back of the manifold it says
PM-6
HF-5

my 88 si says
PM-6
HF-3

Re:*** Identifying IM Sensors.. *PIC*
 

the sensor on the back of the block is the fast idle air control valve. the rest of the vac lines that have to do with the dashpot diaphram i havent seen anything like that befor id just do away with it if u dont have places for all the hoses to go

Re:*** Identifying IM Sensors.. *PIC*
 

Correction: its off of a 91 si hatch.

Re:*** Identifying IM Sensors.. *PIC*
 

lol colten..

alwaystotall: I thought the FICV was under the TB?

ok.. so my 88 doesnt have this.. just leave it disconnected cool.

Re:*** Identifying IM Sensors.. *PIC*
 

the one closest to the throttle body that the coolent hoses run to is eacv or iacv(ive heard it called both)but the other on with the big vac hose running to it is the fast idle control solenoid valve*(on the lower right of the intake man. looking from the front of the car) ,atleast thats the way it is in the 89 civic service manual

Re:*** Identifying IM Sensors.. *PIC*
 

why doesnt my 88 si have this? and im assuming this thing is for warm up higher idle right? mine idle's at 2k when cold.. ?

Re:*** Identifying IM Sensors.. *PIC*
 

coolent temp below 14 deg. far.,and engine speed below 1800 is when it increases the airflow

Re:*** Identifying IM Sensors.. *PIC*
 

so what does my 88 SI do then? it has a cold idle of 2k like normal..?

Re:*** Identifying IM Sensors.. *PIC*
 

that would have to do with the eacv,it dosent come out and say anywhere ive read how that thing works but im guessing the coolent running threw it like makes it heat up that rubber covered spring looknig thing in thier and makes it close off the air opening when the engine gets hot.and then when u turn on the lights or the heater motor the ecu sends a signal to it and opens it up to let tthe engine idle up a little?