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mpfi swap probs

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Old May 8, 2006 | 05:52 AM
  #1  
teg91's Avatar
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Default mpfi swap probs

ok i tryed the mpfi on a 91 crx dx i did the wire had a friend check it i have replaced the main relay and unpluged and jumped the clutch switch(one that lets car start only when it in) i have cleaned the tstat dround grounded the starter and check valve cover grond i have no codes. the problem no power to my fuel pump and start only gets .75v but at the ignition switch it puts out 12v, im stuck i cant think of anything else. so if anyone can help that would be great or i think this project is gonna be a loss cause and sent to the junkyard
Old May 9, 2006 | 09:06 PM
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Default Re: mpfi swap probs

come on anybody got a idea
Old May 9, 2006 | 09:23 PM
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Slo_crx1's Avatar
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From: NE-PA
Default Re: mpfi swap probs

Usually it's the main relay that causes problems like that. I know you said you replaced it, what did you replace it with? Another boneyard relay, or brand new? If it was a boneyard one, take the cover off it and resolder all the joints. Other than that I'd say check all your fuses, and if worse comes to worse, run a new wire from the main relay to the fuel pump. Who knows, it might have a short in it somewhere.
Old May 10, 2006 | 01:57 AM
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Default Re: mpfi swap probs

it was a used one from a htm member and what wire would i run it off of. any idea whats causeing the voltage drop at the stqarter
Old May 10, 2006 | 02:07 PM
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d16u7nh's Avatar
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Default Re: mpfi swap probs

i know this sounds dumb but run a ground wire from the starter to the wheel well. no paint just wire to metal. this little trick got me going
Old May 10, 2006 | 03:32 PM
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Default Re: mpfi swap probs

i tryed that but went staight to battery not body
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