okay we just finished swapping my engine zc in to my 89 civic si and we fired it up and its only running on 2 cylinders. what could be the problem??

 

ohh yehh and there all getting spark too.

 

Check the wiring for the fuel injectors. Hear is a right up I made
https://honda-tech.com/forums/honda-crx-ef-civic-1988-1991-3/diy-dpfi-mpfi-swap-made-easy-2889205/. :Edit: my bad didn't notice you said it was a si

 

First -before you do anything else- do you have compression?

Are the two faulty cylinders getting fuel?
If not, switch injectors out with the two working cylinders and see if the problems changes.


Did you swap any parts over from the Si engine on to the ZC?

 

uhmm can i still use check out that wiring?
yehh i switched over my intake and exhaust manifolds and my distributor. and my tansmission and thats pretty much it.

 

Ya check the wiring. Who knos maybe you pinched a wire or ripped one some where you never kno

 

Is the timing set correctly?
Assuming it's used, have you checked compression?
-Later, BR

 

check ur compression FOO!

 

Hey did you plug in an injector resistor box? what ECU? stock? or PM6 PR4 PG7? and wiring going to the propper pin-outs?
sounds stupid but it sounds like you may have missed a step, and you are only "Using" two injectors from the orgional 1.5
Im an idiot, so check the obvious! cause I sure as hell didn't!

 

If you read carefully, he said he has an 89 SI. They are already multiport. -Later, BR

 

yehh its an SI its already mgfi. okay the compressions good on 3 cylinders its 165 but on cyl. one its 80. and pressure is leaking from cyl. 3 to 4. could that mean a blown head gasket???? and i know the timing aint right yet. havnt timed it.

 

Sounds like you have a blown head gasket between 3 and 4.

 

what that didnt come out right. cylinder 4 is 80 psi and they told me cyl. 3 leaking to 4. could that be causing the low compression. the blown head gasket????

 

Yes a blown head gasket will cause low compression

 

yeah I missed the SI part...sorry