SOOOOooooooooooooo I bought a new D16Y7 off a guy, a good guy i think. anyway after i got it into my civic and got everything hooked up, i crossed my fingers and started it up. It's not idling, it just revs endlessly...... Please if anyone has anything please let me now.

 

Either do a better job of describing what you mean, or post a video.

 

So once i got the engine mounted and hooked up i started it and it doesn't idle, instead it revs continuously... its reved above 6k rpm and i shut it off so i don't blow my new engine. I've looked into the throttle body, intake, IACV, everything and nothing has fixed the problem. I hooked up my scan too and got the code P1509, which is IACV circuit failure.

 

You have a massive vacuum leak somewhere. Why are you swapping a Y7 into an EX? Are you swapping the complete long block, just the short block, or what?

 

Full Long block

 

Including the ECU? What about the harness?

 

just the engine

 

Thou needest more research.

Y7 into an ex is not a plug and play job

 

You need to also swap the ECU, and repin or replace your wiring harness.

 

im just replacing the old y7 with a new one

 

Ex came with a y8 unless swapped before.if it was swapped before and that may have been done incorrectly

 

Listen closely. The Y7 was not stock in the EX trim. Are you saying it already had a Y7 in it and you're replacing that?

 

im saying that i have a 1999 civic ex with a blown y7 that im replacing

 

Me, and everyone else, is saying that the Y7 DID NOT come stock in any EX trim level so it pretty much sounds like you're putting the wrong engine into that car.

 

Did you put the y7 in the car. Not the one you have now, the blown one?

If not assume it was done wrong and redo the wiring and check ecu.

Thus info is important as we can not help you without knowing this information as the car did not...notnotnot come with that engine from the factory

 

at least im pretty sure its an ex

 

Doesn't sound like you're sure.

 

Do you have a sun roof?

 

Skip it. Post up some pictures of everything.

 

no sunroof

 

Then you don't have an EX.

 

the only thing on the back of the car is the honda logo

 

This tells me you don't know what car you have. Which means WE don't know what car you have and therefore cannot help you effeciently, if at all.

 

ill get pictures up tomorrow, its too dark now

 

The VIN would tell you.