Log in

View Full Version : 93 civic dx cranks but won't start, no spark after mpfi swap


norbi_cvc
May 4, 2008, 03:44 AM
Yes I know there're a few topics something 'bout this.
But I made all the troubleshooting steps.

My civic came with dpfi I/m, and I swapped to an MPFI.
What I changed: ECM (PM6 from d16a6 fourth gen civic)
Distributor (td 02u from d16a6 too)
Complete I/m with everything, and injector resistor (from d16a6)

I made the swap, every wire is in its proper place, but:
After I've finished the swap. I turned the ignition key, crank, but the car is only cranking.
I hear the main relay and it clicks and everything, fuel is delivered properly.

So I started troubleshooting: K test normal ecm seems to be OK
Spark test - NG there's no spark
Distributor input test OK
Ignition unit swapped with another one, nothing changed maybe I've 2 bad igniters?

Ignition coil seemed to be in spec when I measured with ohmmeter. Swapped with another one, but nothing happened, still no spark. Maybe I've 2 bad ignition coils?
Then I swapped the ignition unit with my known good one, but from a different kind of distributor, inputs are the same but the hold down screws are in a different place. Nothing, still no spark.
After all I guess my ignition coil is bad (and I've 2 bad ignition coils).

Is there something I forgot? Please help me out with your comments.
What else can I measure out and how.

Just want to update the measures of the ignition coils:
Cause the one I want to use is an older one I've checked the servise manual for 88-91 civic.
It says: between A and B term should be: 0,4-0,5 ohm. I measured both of the coils and they are 0,7-0,8 and 0,7-1,3 ohms. Between a and secondary winding the terms are within spec.

The interesting thing that I discovered: I measured my known good ignition coil for the dpfi distributor. Service manual says: between AB term. 0,6-0,8 ohm, I measured 0,9-1 so it isn't in spec but works fine.

So I've 2 bad ignition coils, right? (third one for dpfi distributor is working fine outside of the spec.)

norbi_cvc
May 15, 2008, 10:47 AM
Okey, I've figured out what was wrong.

I put the old dpfi dizzy back to see if that works. Yes it worked.
New mpfi dizzy up nothing.
Wires looked good, BUT you know there're two white ones ( a thik and a thin one)
I was so stupid cause someone translated an english write-up into hungarian and I did not read the english version. The person who translated it, mixed these: thick/thin.. .

Well, that's all, I swapped the wires, now it runs good. It was my fault, cause I didn't read the original english version... stupid me. :)