89 CRX DX. DPFI-MPFI?
#1
89 CRX DX. DPFI-MPFI?
I have a 89 CRX DX.
I really want to convert it to mpfi and was wondering if I can just use a HF or SI engine bay harness with out any modes to the harness. Did anyone do that before? Tight budget here. Don't wanna waste my money on buying a SI or hf harness for not thing. Thanks in advance.
I really want to convert it to mpfi and was wondering if I can just use a HF or SI engine bay harness with out any modes to the harness. Did anyone do that before? Tight budget here. Don't wanna waste my money on buying a SI or hf harness for not thing. Thanks in advance.
#2
Honda-Tech Member
Re: 89 CRX DX. DPFI-MPFI?
I have a 89 CRX DX.
I really want to convert it to mpfi and was wondering if I can just use a HF or SI engine bay harness with out any modes to the harness. Did anyone do that before? Tight budget here. Don't wanna waste my money on buying a SI or hf harness for not thing. Thanks in advance.
I really want to convert it to mpfi and was wondering if I can just use a HF or SI engine bay harness with out any modes to the harness. Did anyone do that before? Tight budget here. Don't wanna waste my money on buying a SI or hf harness for not thing. Thanks in advance.
http://www.fourthgenhatch.net/mpfi.html
#3
Re: 89 CRX DX. DPFI-MPFI?
While I was looking around on here for this exact kind of info. I read up on the Web-page you listed.. I cant seem to find any info to explain more about the injector resistor box, I am currently doing a d15b swap on my 91 DX. Dpfi-Mpfi, being I will be running a vtec and obd-1 computer box. Will i need the injector box or not? kinda stumped here. It also is confusing me with the wireing, according to the diagram given it is say that the #1 main injector on the DP will be #3 injector on the MP? And Im guessing the 2 AUX injectors on the DP are #1 and #2 for the MP? Sorry guys kinda lost on this wireing. Thanks in advance for any help.
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Re: 89 CRX DX. DPFI-MPFI?
While I was looking around on here for this exact kind of info. I read up on the Web-page you listed.. I cant seem to find any info to explain more about the injector resistor box, I am currently doing a d15b swap on my 91 DX. Dpfi-Mpfi, being I will be running a vtec and obd-1 computer box. Will i need the injector box or not? kinda stumped here. It also is confusing me with the wireing, according to the diagram given it is say that the #1 main injector on the DP will be #3 injector on the MP? And Im guessing the 2 AUX injectors on the DP are #1 and #2 for the MP? Sorry guys kinda lost on this wireing. Thanks in advance for any help.
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Re: 89 CRX DX. DPFI-MPFI?
IGN HOT-->resistor box-->4 wires to injectors-->colored wires from injectors to ecu
edit: err late post
should have 12-14ohms across each injector circuit total, results will vary depending on what type of injector you are running
edit: err late post
should have 12-14ohms across each injector circuit total, results will vary depending on what type of injector you are running
#6
Re: 89 CRX DX. DPFI-MPFI?
with the OBD1 injectors, you don't use the injector resistor box - as for the injector wiring, on the DPFI chassis harness you have a yellow wire at ECU pin A1 and a yellow wire at ECU pin A3 - these yellow wires connect together inside the harness and become one yellow wire which runs to the DPFI auxiliary injector - you have a red wire at ECU pin A5 and a red wire at ECU pin A7 - these red wires connect together inside the harness and become one red wire which runs to the main DPFI injector - in order to get 4 wires from the ECU to the 4 MPFI injectors, you need to cut the existing yellow wire at A3 and cut the red wire at A7 and connect 2 new wires (one to each) to the portion connected to the ECU and run them out to the engine (leave the cut wires that remain in the harness not connected to anything) - A1 controls injector #1, A3 controls injector #2, A5 controls injector #3 and A7 controls injector #4 - you take the 4 yellow with black stripe wires from each of the 4 MPFI injectors and the 2 yellow with black stripe wires that ran to the 2 DPFI injectors and connect them all together - see the attached PDF for DX to D16Z6 wiring (D15B will be the same)
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Re: 89 CRX DX. DPFI-MPFI?
the 4 yellow/black wire from the injectors are for power - they connect to the 2 yellow/black from the DPFI injectors, which is also power - the yellow/black originate at the main relay as one wire and splits into 2 wires inside the harness - actually, you only need to connect 1 of the yellow/black from the DPFI injectors as they are both the same - if you just connect one, make sure you tape up the other real well so it can't short out on anything - it is "hot"
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Re: 89 CRX DX. DPFI-MPFI?
the 4 yellow/black wire from the injectors are for power - they connect to the 2 yellow/black from the DPFI injectors, which is also power - the yellow/black originate at the main relay as one wire and splits into 2 wires inside the harness - actually, you only need to connect 1 of the yellow/black from the DPFI injectors as they are both the same - if you just connect one, make sure you tape up the other real well so it can't short out on anything - it is "hot"
#10
Re: 89 CRX DX. DPFI-MPFI?
Aha! Now I understand it.. The yellow/black wire is hot and runs as a constant power supply while the 2nd wire to each injector is used kinda like a toggle switch, to sorta flip a breaker and allow fuel to go through when needed... Wiring these little cars seemed difficult but is becoming easier. Well thank you for your help. Thank god someone knows what to do!
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