So I did my mpi conversion today in my 88 civic So ill give you a low down of what the specs are

Using a full si engine wire harness

Got everything Wired up correctly started right up! Surprisingly

now for the problem

Runs good except for the idle is crazy out of control I dont know if its due to vacum or what.

I have not bolted up exhaust yet so its open header.... but i dont think that is causing it to idle surge like that

There is a piece missing from my throttle postion sensor but it plugs in and is wrapped with electrical tape.

There is one vacuum hose I don't have hooked up because its supposed to hook into a nipple on the back of the intake mani which i don't have my doesn't have should I tee it into the one that goes into the top of the throttle body ?

Also there is something else i dont know where it goes there is a nipple standing straight up on intake manifold on pass side does that go to other nipple on throttle body ?

appreciate your answers thanks

also i only used a jug of coolant its not full

 

check the wires on your throttle position sensor, the two outside wires have to be reversed.

 

y would i have 2 do that im usin full si harness

 

not the best idea..... but whatever.


Once you rule out vaccuum leaks, check the FITV and the IACV.

 

why you say that it starts right up

 

Had kinda the same problems. it was the vaccuum lines.... what kinda throtle body are you using

 

idk ill prob take pics I put my hand over throttle body and it idled itself out i dont have a spot for the lil vacuum hose everything else looks right im pretty sure its a vac issue now

 

Also i dont have a dashpot if that makes a difference also need info on nipple on runner of intake manifold that shoots coolant out of it here is a pic of it http://radekonline.com/download/engine/mani_rail.jpg also i have no intake on the car right now would that effect it ? seems how it doesnt have a mass