okay...this is gonna be long, so brace yourself. refer to summary at bottom if you are lazy.

the basics:
i have an 89 civic hatchback DX. its got about 290k miles on it, and it was burning oil pretty bad.
i purchased a complete d16z6 longblock back in february, and it was sitting in my garage till i found a long weekend to pull the old motor. about two weeks ago i experienced catastrophic engine failure, and was FORCED into doing the swap (the engine failure was really quite hilarious, but thats another thread in and of itself).

so we drove the car into the garage, pulled the old motor and dropped in the z6 with some difficulty, and bolted everything up.

parts i used in the swap:
z6 longblock
LS tb
custom gaskets (props to h-t member WrongWD)
IACV from a d15b8 (bolts up with one bolt)
virgin p28
jkobd obd0 to obd1 jumper harness
obd1 reverse switch
obd1 z6 engine harness
lots of patience

okay here is the tricky part: we used the obd1 Z6 engine harness instead of adding wires to the dx harness (i know this woulda been easier, but its done now, so cry about it). we converted the shock tower plugs to the obd0 clips, and switched the wires around so that everything would match up. performed an mpfi wiring swap on the dx car harness at the ecu (ran the crank position sensor wires and extra injector wires to the shock tower plugs where they were for the z6 harness). after messing with the injector grounds a bit, and re-wiring the O2 sensor straight to the ECU, we got it to run with no codes at all. idle is fairly consistent, but does bounce a bit. i couldnt be sure of how much because im still using the dx cluster (no tach ) we drove it around the block, and it seemed to run well enough.

HOWEVER, there are some big issues:
1)it bogs pretty badly at low rpms
2)its running SUPER hot. after about 10 seconds of running, the runners on my header will burn anything they touch. my fingertips are hating me for this one! runners 2 and 3 seem to be hotter than 1 and 4.
3)after running for a bit, smoke starts coming from and arond the intake manifold. this includes the IACV and from underneath the intake manifold. i cant be sure if its coming from one place down low, or just all over behind the block. the smoke is not particularly blue or black or white, just...smokey.
4)it seems to be misfiring some (not detonating)

some minor issues (not so important):
wiring for fan switch and reverse lights have not been figured out. anyone with insight on this let me know. the wires for them are on the drivers side showck tower, but which ones go where? there are a couple green, green/black wires and a yellow wire.

so here are my ideas:
its clearly got some issues somewhere, because it is both bogging and running super hot (probably running lean, or having severe cooling issues).
the smoke at the IM could be perhaps a coolant line hooked up wrong? or maybe the d15b8 iacv doesnt actually work with the z6 IM?
i retarded the timing all the way at the dizzy, to try and encourage it to run colder. now, when i turn it on, the idle sorta drops away and it dies.

i have tested all of the mpfi wiring, and all of the injectors are going to the correct place. the resistor wires are hooked up in a way that SHOULD work, and they seem to be working.
i thought we made a good seal at the intake manifold, with the correct gasket and gasket sealer.
i honestly am not sure what the issue is!
and remember, NO CODES!

summary:
z6 swap into 89 dx
mpfi conversion
custom obd1 conversion with z6 engine harness, p28.
runs, but way too hot.
bogs also.
smoke from IM, IACV, and underneath.

thanks for your assisstance!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ecovillain &raquo;</TD></TR><TR><TD CLASS="quote">
obd1 z6 engine harness
</TD></TR></TABLE>
oh nooo LOL

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ecovillain &raquo;</TD></TR><TR><TD CLASS="quote">
1)it bogs pretty badly at low rpms
2)its running SUPER hot. after about 10 seconds of running, the runners on my header will burn anything they touch. my fingertips are hating me for this one! runners 2 and 3 seem to be hotter than 1 and 4.
3)after running for a bit, smoke starts coming from and arond the intake manifold. this includes the IACV and from underneath the intake manifold. i cant be sure if its coming from one place down low, or just all over behind the block. the smoke is not particularly blue or black or white, just...smokey.
4)it seems to be misfiring some (not detonating)
</TD></TR></TABLE>

Misfiring could be the result of distributor not firing at the right time, or injector not firing at the right time. You'll need to check your wiring. Too bad you didn't do it the right way using the DX harness, its all easy to trace that way. I would still suggest you revert to stock dx wiring and try again. If you do, i'll provide you with enough correct information to complete it.

2. The exhaust runners should be hot after 10 seconds of running, You don't go putting your hand on the frying pan do you? Same principle, thats fire underneath it.

3. smoke shouldn't have an opportunity to escape... all the seals and gaskets should prevent that. You need a new exhaust manifold gasket, probably intake gasket... and probably piston rings LOL

I see questions like this alot where the person hasn't done a valve adjustment, distributor timing, idle adjustment... etc... have you done all that?

 

alright, if i cant figure out i may revert to dx wiring.
but, in the meantime...

the reason i say it is running hot is because not only is the header hot, but the valve cover as well. the motor just seems way too hot.

and what could make it bog?

bump for more help!

 

bump!

 

the heat might be from it running lean? the smoke may be a coolant leak at the intake manifold. did you change the gasket? the fan switch either gets a plug put on it and moved to the z6 location at the thermo housing or there may be a bolt in the z6 block where the switch is on the obd0 motor and you can just remove the bolt and put the switch in. the bogging sounds like the dist. or ignitor may be bad? i'm fighting with a z6 that was supposed to be plug and play, and have been for two months

 

hmm. well it seems that we are in the same boat. i will check the dizzy. i did use a brand new intake mani gasket, cleaned all surfaces well also...

hmm. any other ideas?

 

bump for something thats had us stumped

 

bump.. poor bastads
I hope you figure out the smoking issue... and i hope you use Rywire for the wiring next time LOL

 

we're working on it.

if you have 4 signal wires for 4 obd1 injectors, for 'hot' yellow/black wires for 4 obd1 injectors, 4 signal wires for an obd0 mpfi converted ecu harness (then attached to your jumper harness, then a p28), and two yellow/black hot wires from the two dx injectors, what would you do with them? how would you hook up the hot wires? remember, no resistor box!

 

hey yall, i think it works. sweet!

 

If its still bogging at low RPM's thats usually the Cam timing off from the Crank, make sure its set right at TDC on the crank.

I had a similar problem on a friends Dohc ZC and I found out his Intake cam was off by 2 teeth I fixed that and it hauls *** now, no bogging.

 

we havent fucked with the timing at all, save moving the dizzy back and forth a bit.

i tihnk its bogging because its running WAY to rich. smells like gas, burning gas like an SUV. im gonna get a new O2 sensor. (I also got a code 1 after a while--O2a.) so yea, O2 time.

new fuel filter and plugs are coming soon too.