1991 civic, dpfi to mpfi problems. Obd0 to obd1.

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Old Sep 24, 2018 | 09:48 AM
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Rafael Pastrana's Avatar
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Default 1991 civic, dpfi to mpfi problems. Obd0 to obd1.

Stock d15b2 engine on it, p61 ecu(i know its not supposed to but I am gonna get it programed for my engine for now). The problems I'm having is that I'm not getting any fuel to the engine and a code 0 solid cel(with or without service connector). When I finished with the wiring and got the ecu in it, it wouldn't prime so I thought the main relay was bad. I got a new and still nothing doo I decided to bypass the main relay(added 3 cables to the bottom 3 cables on the connector) and it primed gas!! Managed to start it that way and when I ran it, it went to limp mode, or stayed at 3000rmp(keeping in mind it wasn't running with the main relay on). Any help would be highly appreciated. If anything is not clear enough let me know. Thanks in advance.
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Old Sep 26, 2018 | 09:08 AM
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Default Re: 1991 civic, dpfi to mpfi problems. Obd0 to obd1.

P61 ECU is most likely your problem? You should be using a PM6 or a PR4
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Old Sep 26, 2018 | 11:16 AM
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Rafael Pastrana's Avatar
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Default Re: 1991 civic, dpfi to mpfi problems. Obd0 to obd1.

Originally Posted by Ed3joe
P61 ECU is most likely your problem? You should be using a PM6 or a PR4
Thanks, I'll have it programed this weekend so that it runs a D15 map. But do you also think this is why I'm not getting a click on the main relay? Can it be the ignition switch also?

Remeber it's obd1 swapped so pm6 wouldn't work.
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Old Sep 26, 2018 | 11:40 AM
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Default Re: 1991 civic, dpfi to mpfi problems. Obd0 to obd1.

You didn't say that it was OBD1 in your first post, and sadly Ed3joe doesn't seem to be omniscient. Is your D15B2 MPFI swapped? What wiring modifications have been done?
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Old Sep 26, 2018 | 12:09 PM
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Rafael Pastrana's Avatar
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Default Re: 1991 civic, dpfi to mpfi problems. Obd0 to obd1.

Originally Posted by scelestus
You didn't say that it was OBD1 in your first post, and sadly Ed3joe doesn't seem to be omniscient. Is your D15B2 MPFI swapped? What wiring modifications have been done?
Sorry for that, it must've been in another thread. But I did say it had a p61 ecu which is obd1. It is MPFI swaped, I did the engine harness my self of a page called angel fire and I bought a obd0 to obd1 ecu harness.
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Old Oct 1, 2018 | 10:42 AM
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Default Re: 1991 civic, dpfi to mpfi problems. Obd0 to obd1.

Originally Posted by Rafael Pastrana
I did the engine harness my self of a page called angel fire and I bought a obd0 to obd1 ecu harness.
Is it a name brand ecu harness or a cheapy ebay/china deal? I had to re-pin one of the cheapy ones last time i did this swap. (Z6 into a '90 wagon... but pretty much the same)

no guarantee, but if I still have the pinout cheat-sheets and you want to double check your harness i can send them to you.
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Old Dec 22, 2018 | 08:24 PM
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tmurph's Avatar
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Default Re: 1991 civic, dpfi to mpfi problems. Obd0 to obd1.


shows a lot about the wiring and things needing to sort out the swap
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Old Dec 22, 2018 | 08:47 PM
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Default Re: 1991 civic, dpfi to mpfi problems. Obd0 to obd1.

https://www.ebay.com/i/202544826373?chn=ps
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Old Dec 22, 2018 | 09:20 PM
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89ED's Avatar
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Default Re: 1991 civic, dpfi to mpfi problems. Obd0 to obd1.

Your car doesn’t start as of now?? Right. Your going to have to fix the wiring after you teach yourself how it works. Then possibly still have to pay to get it fixed like it did.$$$ then pay to get an ecu programmed$$$

If you get the pm6 you pay for that which will be half of what you pay for programming. Then you can pay to get you wirining fixed.

Cheaper


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Old Dec 23, 2018 | 09:47 AM
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muellersfan's Avatar
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Default Re: 1991 civic, dpfi to mpfi problems. Obd0 to obd1.

Information in first post seems to point to a main relay or main relay circuit problem.
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Old Dec 23, 2018 | 08:34 PM
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4drEF's Avatar
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Default Re: 1991 civic, dpfi to mpfi problems. Obd0 to obd1.

Solid cel is very common to having at ground disconnected at the thermostat housing.
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Old Apr 26, 2020 | 04:41 PM
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Default Re: 1991 civic, dpfi to mpfi problems. Obd0 to obd1.

Originally Posted by hondamark35
Is it a name brand ecu harness or a cheapy ebay/china deal? I had to re-pin one of the cheapy ones last time i did this swap. (Z6 into a '90 wagon... but pretty much the same)

no guarantee, but if I still have the pinout cheat-sheets and you want to double check your harness i can send them to you.
hey man can u send me those by chance?
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Old Apr 29, 2020 | 02:04 AM
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Default Re: 1991 civic, dpfi to mpfi problems. Obd0 to obd1.

Originally Posted by efhoarder.ca
hey man can u send me those by chance?
https://honda-tech.com/forums/honda-...iring-3154100/

I didn't have anything better than what you'll find in the thread above
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