Ok, before I get yelled at see where I am coming from. I am seventeen, need a car, I have had my 89 Civic since I was fifteen. Ok, I bought a D15B VTEC (SOHC VTEC motor, with all the MPFI stuff, and a OBD1 conversion harness. Well, I got the stupid idea to instead of wait and learn the wiring, slap on my DPFI manifold, the pre OBD dizzy, and run it I guess as a D15B2 or something. Well I got the DPFI manifold on, the dizzy is on...I hope, had to do some custom work . Now I have the DPFI plugged in right, dizzy plugged up, starter right, altenator right, now will this work lol? I tried starting, and what happens is the main relay I guess it is buzzes, and the ECU throws a solid light. Wont flash, just a solid red light. When I try and start everything kind of dims. I THINK all my grounds are put on. I am lost now. Any ideas, will this even work? Any help is GREATLY appreciated I need a car to drive and race (autocross). Thanks!

 

of course it wont work you tryna run obd1 stuff with a obd0 ecu

 

well I modified my distributor off of my A6 motor to fit my D15B VTEC motor and I also swapped the A6 injectors and FPR as well. You will notice the new injectors wont work w the old engine harness plugs anyways - so you HAVE to use them. Other than that everything else plugs right up and I am still using the old PM6 ECU. Tonight my obd-0 to obd-1 jumper harness comes in and I will be swapping out the obd-0 distributor and 02 sensor and swapping the PM6 for the P08 ECU and witing up VTEC then be ready to go.

 

A solid LED on the ecu usually means the ecu is dead. List exactly which ecu and distributor you are running. IMO run the engine how it should be(OBD1) or don't run it at all. Running the d15b w/dpfi is just stupid imo.

 

the only thing i am trying to run that is obd1 is the block. everything else is the same off my d15b2 motor that i ran before, ecu, manifold, dizzy, all that. i just dont know how to set the obd1 and mpfi up and i need a car now which is why i am trying this, why wouldnt it work, isnt it the same as basically having a hotter d15b2?

 

It should work but not well and you will not have VTEC. Check all of your wiring and grounds again. What modification did you have to do to put the OBD0 dizzy onto the d15b head?

 

I know I wouldnt have VTEC, but if I can at LEAST have the power of a D15B2 I would be happy for now (w/e power that is lol) The modification is very dumb and could be a problem, we had to cut the holes where it bolts to so it would line up, it is very tight and can still be turned. The motor is getting gas I know that, lights and all work, checked battery, I guess I will look at grounds again.

 

Is it getting any spark? I have a feeling it may have something to do with the dizzy.

 

Well it wont even turn over, when I turn it the buzzing gets louder and everything dims kind of like a dead battery, but we tried charging the battery and jumping it off. The car sat since New Years.

 

Could the dizzy make the main relay buzz?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Simon Tibbett &raquo;</TD></TR><TR><TD CLASS="quote">Could the dizzy make the main relay buzz?</TD></TR></TABLE>
No.


Here's what confuses me;
DPFI manifold
pre-OBD MPFI distributor

What ECU are you running?
what has been done to the wiring?

This should have been a simple swap.
You should have taken out the old engine, put all the stuff from the old engine on the new engine, and dropped it in. Done.

Seems like you mixed some parts up.
what I'm getting at is - was the car originally DPFI? Are you still running the stock ECU? If so, then you should be using the DPFI distributor and the complete engine harness that came from the DPFI motor.

 

are you using a resistor box with obd1 injectors?

why dont you run then engine the correct way?

 

Ok, I took the VTEC motor, took the MPFI manifold off. Put my old DPFI one on. Took the OBD1 dizzy that came on the VTEC motor off, put my old one on. wired it up like my old D15B2 was. I THINK all the grounds are right. I dont have a resister box as I put everything that was on the old motor back in but with the VTEC motor itself.

 

Oh and it is a DPFI dizzy, my old motor was a 1.5 liter DPFI motor.

 

Anyone else? Any ideas? I dont know why this would not work.


DPFI manifold- using it.
pre-OBD MPFI distributor- it is a pre-OBD DPFI dizzy

What ECU are you running?- the 89 Civic std. model one.
what has been done to the wiring?- nothing, stock the way it was on my old motor.

Car was origianlly DPFI, I am trying to keep it DPFI right now.

Are there sensors on the D15B VTEC block that need to be plugged up that may not match my old harness or need mods to match?

Any help is

 

Sounds like your car is extremely confused....

I hope you get what you want out of this....Good luck....got any pics....

 

excuse my noobness at this as i am still learning.

let me get this straght. ur using the mecanics of a OBD1 D15B motor but ur using the electrical OBD0 D15B2 motor.

as for the buzzing relay. that has nothing to do with ur "frankenstine" motor. sounds to me like u got a bad ground, a loose/forgotten plug, or somthing not pluged in to the right spot.

i am 99.99% sure that the DPFI injectors dont need a resteor.

 

how many grounds you have hooked up?

i think you are missing the trans ground. similar thing happened to me.

 

you should have 3 grounds on the engine:

1 to head
1 to trans
1 at t-stat housing

 

Right, I have the mechanics of the D15B VTEC itself, but ALL the wiring is from my old D15B2 motor. I will take some pics, maybe someone can tell if a ground is missing. I will check and make this work hopefully! Thanks!

 

Should work 100%.
You did it right.

Weird that you get a solid cell now.
Definitely check through all your connections and make sure nothing is on wrong.
Maybe even start disconnectng major wire connections and see if the cell clears.

 

When you decide to make it right, and go obd1+mpfi give us a call
rywire.com

 

So could the main relay be the problem? I am going to take it out when I get home from school. Check all my grounds as well. Could all this be from a bad ECU it was out of the car for a few months.

 

The ecu doesn't just go bad from sitting. It would need to be damaged by heat, water, excessive pressure, etc.

 

Well it shouldnt be bad sat in my room. I will check everything everyone mentioned as soon as I get home. Thanks!