Mpfi dohc ZC swap crank fuel spark but no start

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Old Jan 2, 2008 | 02:23 PM
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efprojectboost's Avatar
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From: Porter Ranch, CA, USA
Default Mpfi dohc ZC swap crank fuel spark but no start

PLease can someone give me a hand i did the swap 2 days ago followed everything for the mpfi swap and dropped in the dohc ZC in cranks fine fuel pump works but it doesnt start i used the resistor box from a 90 teg but it doesnt have the wires everyone says it only has a 1 RED and 4 Black thats all i checked the the cps wires reversed them too nothing then the white wires on the distributors switched them and nothing your help is greatly appreciated this being my first swap and researching everything has taken its time, im running out of it, thanks.
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Old Jan 2, 2008 | 02:43 PM
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From: Belton, TX, USA
Default Re: Mpfi dohc ZC swap crank fuel spark but no start (efprojectboost)

u got the red wire ran to the two yellow wires from the dpfi right? And the blacks to the injectors? And you tried switching the white wires at the dizzy?
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Old Jan 2, 2008 | 02:45 PM
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From: Belton, TX, USA
Default Re: Mpfi dohc ZC swap crank fuel spark but no start (thatEFboy)

Are you getting fuel thur the injectors (not to them but do they actually spit)? And you got spark. Did you check timing and compression?
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Old Jan 2, 2008 | 04:12 PM
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efprojectboost's Avatar
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Default Re: Mpfi dohc ZC swap crank fuel spark but no start (thatEFboy)

yeah i wired the 2 yellow and black to the red and the red black wires to the black on the resistor box i havent checked the timing but it came off a working right hand drive, i looked at the spark and its really weak but no sign of i wanting to go on, ive tried swapping the wires from the distributors but there is solid white and white and another color its driving me nuts i know im so close to firing it up but so far f*&k LOL
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Old Jan 2, 2008 | 04:16 PM
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From: Panama City, FL, USA
Default Re: Mpfi dohc ZC swap crank fuel spark but no start (efprojectboost)

Make sure all your grounds are attached and that there are no blown fuses both under the hood and inside.
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Old Jan 2, 2008 | 04:58 PM
  #6  
efprojectboost's Avatar
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Default Re: Mpfi dohc ZC swap crank fuel spark but no start (wood 1)

Hey wood i checked the fuses they are all fine the grounds i think they are all good i just dont remember how many grounding points there are, a lot of people have the same problem as i do with the white dizzy wires, they switch them and everything is all good but i wana make sure which two wires are those, thanks for the help this is driving me nuts
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Old Jan 2, 2008 | 05:25 PM
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From: colorado springs, co, usa
Default Re: Mpfi dohc ZC swap crank fuel spark but no start (efprojectboost)

make sure you have the ground, coming out of the harness (red arrow), connected to the bolt on the thermostat housing



make sure you have spark plug wires in the correct locations



DOHC ZC distributor connector wire locations - if you did a DPFI to MPFI, you shouldn't have needed to touch the distributor connector






Modified by jlicrx at 7:56 PM 1/2/2008
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Old Jan 2, 2008 | 05:56 PM
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From: colorado springs, co, usa
Default Re: Mpfi dohc ZC swap crank fuel spark but no start (jlicrx)

what ECU do you have?
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