Thinking of Civic DX to HX Conversion (lean burn engine)

[ron]

from what I have heard the ecu is able to do it. thats one of the reasons bosch has made the wide band. look a your sensor to see how many wires it has, If I recall correctly 3or less and your able to improve. check the innerweb I dont remember the site but a miata post explains the upgrade/good pictures and should work the same on other models

[drmiller100]

i'd be surprised if the hx uses the same fuel injectors as a DX.

pretty hard to swap an obd2 engine, and still have it pass smog. usually they plug in, and want to see the right VIN number inside the ecu.

Reprogram VIN in OBD2 computer? - Honda-Tech

the VIN includes the hx/dx model, so I don't know if the dealer would even do it for you.

Not saying it can't be done, but.....

Also, finding the ECU for a 97 civic is like dead easy boring. Don't you have a pick a part locally? here they sell for 40 bucks.

[California98Civic]

Originally Posted by drmiller100

i'd be surprised if the hx uses the same fuel injectors as a DX.

On honda automotive parts .com I see the same part number for the HX and DX fuel injectors: 06164-P2A-000.

Originally Posted by drmiller100

finding the ECU for a 97 civic is like dead easy boring. Don't you have a pick a part locally? here they sell for 40 bucks.

I have established a good relationship with a wrecker parts dealer here. I got a replacement ECU because the service manual diagnostic procedure called for a "known good" one at a certain point. I got lucky when installing the ECU did not fix the problem, the place gave me my $100 back. A buddy and I are going to another site, maybe, on Dec 31. I'll put O2 sensors on the list to peek at.

[ron]

ecu should increase or decrease the injection duration so the same injectors can be used on many models. I will see if I can find that web for the upgrade

[drmiller100]

Originally Posted by ron

ecu should increase or decrease the injection duration so the same injectors can be used on many models. I will see if I can find that web for the upgrade

on the 90-95 civics, the high fuel engines were much less horsepower then the base models.
One of the limits on injectors is flowing enough flow at continuous. the other limit is PRECISELY metering the correct fuel amount at idle.

if you run too big of an injector, you can't make it idle "cleanly."

If I am wrong and they do indeed use the same injectors, so be it. I guess my point is I would sure check part numbers if I were serious about trying this conversion.

[ron]

i should finish my post . Ill check the web for the upgrade to the oxygen sensors. I too would double check part numbers and me also, I have lost a half step or two, it happens