FPDM help

wraitherlx · June 30th, 2009, 02:15 PM

has anyone had any experience with an FPDM failing on them? Reason why i am asking is im having issues right now with, im thinking, my fuel system. after i got my car back together she was fine for about a week and then threw a P0356 code for "Ignition Coil F Primary Circuit Malfunction". So I checked all the coils for resistance and spark and all checked out. Checked the line for continuity from the coils to the PCM and it checked out. So i cleared the code and it ran fine for about 10 minutes so it started to stumble and my WB would gradually lean out from 14.6. So I checked all my injectors to make sure they were plugged, changed out my fuel filter, and everything checks out. Fuel pressure at idle is at a steady 30psi. Cleared the code and let it run and same symptoms but now I got 2 codes; P0356 and P1233. P1233 states that "Fuel system disabled or offline". it also mentions something about my FPDM that it might be malfunctioning. I made sure that the inertia switch was plugged back in, which it was, but now im stumped. Any help would be greatly appreciated.

SWEET2KSTANG · June 30th, 2009, 09:57 PM

stock pump? what power level you at?

wraitherlx · June 30th, 2009, 11:12 PM

yeah stock pumps, really not sure about power as ive yet to get it dynoed but the mods are in the garage if that will help you out at all.

wraitherlx · July 1st, 2009, 09:54 PM

Got it figured out. The P0356 was the main code that kept coming up. I did a continuity test again just to make sure from each B+ wire of each coil and then checked at the ECU. Just kept moving one probe back until I hit a spot that did not make an audible noise on my meter. Turned out that the #6 coil had a break somewhere. I traced the wire and found the spot. The wire had broken down internally inside the insulation but was still somewhat touching each other. when the car is idling it was fine but when i got on it I guess the wires would pull apart and then throw the code.

SWEET2KSTANG · July 1st, 2009, 10:35 PM

glad you got it figured out.

wraitherlx · July 1st, 2009, 11:44 PM

Originally Posted by SWEET2KSTANG

glad you got it figured out.

thanks bro

June 30th, 2009, 02:15 PM	#1
wraitherlx MM Electrical guru '99 SVT Cobra Join Date: Nov 2006 Location: Virginia Beach, VA Posts: 4,267	FPDM help has anyone had any experience with an FPDM failing on them? Reason why i am asking is im having issues right now with, im thinking, my fuel system. after i got my car back together she was fine for about a week and then threw a P0356 code for "Ignition Coil F Primary Circuit Malfunction". So I checked all the coils for resistance and spark and all checked out. Checked the line for continuity from the coils to the PCM and it checked out. So i cleared the code and it ran fine for about 10 minutes so it started to stumble and my WB would gradually lean out from 14.6. So I checked all my injectors to make sure they were plugged, changed out my fuel filter, and everything checks out. Fuel pressure at idle is at a steady 30psi. Cleared the code and let it run and same symptoms but now I got 2 codes; P0356 and P1233. P1233 states that "Fuel system disabled or offline". it also mentions something about my FPDM that it might be malfunctioning. I made sure that the inertia switch was plugged back in, which it was, but now im stumped. Any help would be greatly appreciated. __________________ MM Cobra Club Founder Benjamin Franklin - "He who sacrifices freedom for security deserves neither." Last edited by wraitherlx : June 30th, 2009 at 02:27 PM.

June 30th, 2009, 09:57 PM	#2
SWEET2KSTANG mm's nitrous mod 2000 mustang gt 11.79@115.83 Join Date: Oct 2006 Location: N.W. AR Posts: 8,879	stock pump? what power level you at? __________________ right now, she is a jackstand warrior if the car was a horse, i would shoot it!!! project warhorse under construction almost done

June 30th, 2009, 11:12 PM	#3
wraitherlx MM Electrical guru '99 SVT Cobra Join Date: Nov 2006 Location: Virginia Beach, VA Posts: 4,267	yeah stock pumps, really not sure about power as ive yet to get it dynoed but the mods are in the garage if that will help you out at all. __________________ MM Cobra Club Founder Benjamin Franklin - "He who sacrifices freedom for security deserves neither."

July 1st, 2009, 09:54 PM	#4
wraitherlx MM Electrical guru '99 SVT Cobra Join Date: Nov 2006 Location: Virginia Beach, VA Posts: 4,267	Got it figured out. The P0356 was the main code that kept coming up. I did a continuity test again just to make sure from each B+ wire of each coil and then checked at the ECU. Just kept moving one probe back until I hit a spot that did not make an audible noise on my meter. Turned out that the #6 coil had a break somewhere. I traced the wire and found the spot. The wire had broken down internally inside the insulation but was still somewhat touching each other. when the car is idling it was fine but when i got on it I guess the wires would pull apart and then throw the code. __________________ MM Cobra Club Founder Benjamin Franklin - "He who sacrifices freedom for security deserves neither."

July 1st, 2009, 10:35 PM	#5
SWEET2KSTANG mm's nitrous mod 2000 mustang gt 11.79@115.83 Join Date: Oct 2006 Location: N.W. AR Posts: 8,879	glad you got it figured out. __________________ right now, she is a jackstand warrior if the car was a horse, i would shoot it!!! project warhorse under construction almost done

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