91 Civic Ignition Question

[gadawg31]

I am going to look at a 91 civic DX HB and I have been told it has had a head swap. The last time I looked at the engine, the stamp had D15B2 on it. At the time I did not know the head had been changed. I am going back to find the head stamp, to see which one it is. I have been told that if a head swap was done, then the ECU would have had to be changed and possibly the distributor. If this is true, are there any specific numbers I can look for to see if the correct ECU is on the car? I know I need the head stamp in order to get the correct distributor and correct firing order, but would think I would need to correct the timing. Apparently it does not run and I am thinking the ignition might have something to do with it. Any suggestions/recommendations on what to look for? Thanks.

[Tony]

Its been a while since I have messed with SOHC stuff, but the biggest thing you need to know is what kind of head is on it. Is it the OBD0 MPFI head, OBD1 Z6 VTEC head, or OBD2 Y8 VTEC Head. Head stamp will tell you that, but if you do some research you can tell just by looking at them.

Any way around it, if its not the DPFI head, it needs a new distributor, some added wiring and a new ecu. Do a quick MPFI Conversion search and you will find a list of what all needs to be done for it to work. If you throw in a different OBD system, you got some more wiring to do and different ECU and distributor again.

99% of all inline 4 cylinders share the same 1-3-4-2 firing order. There are a few odd balls out there that gotta change it up, but most are all the same.

Even if there are some other issues with the engine and the chassis is in good shape for a cheap price. SOHC engines are cheap and easy to come by. You can usually get a good deal on an older chassis like this that isn't running.

[fmotodiao]

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