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SN-95 and New Edge Mustangs
Dies after a minute or so, rough idle, but starts right back up
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<blockquote data-quote="Makobra" data-source="post: 16429242" data-attributes="member: 193575"><p>okay party people here is the fix for my fuel pump shutting off after only a minute or so.</p><p></p><p>backstory: the previous owner killed the previous build by running a returnless fuel rail (mach 1) on this return style system.</p><p>I knew this when buying the car, got proper fuel rails, made a proper system, and even replaced all of the fuel pump, injectors, sender, the whole nine.</p><p></p><p>but apparently if you deadhead a fuel pump long enough on these cars it can take out this circuit which is in charge of monitoring voltage from the pump. so, not only did the cylinders get washed out causing piston slap but that particular circuit in the pcm was fragged.</p><p></p><p>last night we finally figured out exactly what the problem was; that circuit. so the fix? the relay just needed a ground so when we grounded out this one terminal for this one relay she ran exactly as she ought.</p><p></p><p>the fix was one wire. I didn't cut the old one, its taped up really well to the relay harness in case I ever actually replaced the PCM. if I do that all i'd need to do is revert back to stock and we're good to go.</p><p></p><p>UPDATE EDIT! Turns out I was wrong, dead wrong, I went to button things up and ground this green wire really well... car wouldn't start. why? because I was doing what the ECU was doing after a minute... this fuel pump relay is wried so that its always engaged and it exists only for the PCM to be able to turn the fuel pump off.</p><p></p><p>apparently this controls the secondary full power mode for the pump but the pump is getting full battery voltage at idle so i suspect the PCM has been programmed to shut off the two stage fuel pump setup.</p><p></p><p>TLDR: if your fuel pump shuts off after only a minute just jump this relay and you can bypass the PCM cutting off the pump.</p><p></p><p>DO NOT DO THIS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!</p><p>[ATTACH=full]1643765[/ATTACH]</p></blockquote><p></p>
[QUOTE="Makobra, post: 16429242, member: 193575"] okay party people here is the fix for my fuel pump shutting off after only a minute or so. backstory: the previous owner killed the previous build by running a returnless fuel rail (mach 1) on this return style system. I knew this when buying the car, got proper fuel rails, made a proper system, and even replaced all of the fuel pump, injectors, sender, the whole nine. but apparently if you deadhead a fuel pump long enough on these cars it can take out this circuit which is in charge of monitoring voltage from the pump. so, not only did the cylinders get washed out causing piston slap but that particular circuit in the pcm was fragged. last night we finally figured out exactly what the problem was; that circuit. so the fix? the relay just needed a ground so when we grounded out this one terminal for this one relay she ran exactly as she ought. the fix was one wire. I didn't cut the old one, its taped up really well to the relay harness in case I ever actually replaced the PCM. if I do that all i'd need to do is revert back to stock and we're good to go. UPDATE EDIT! Turns out I was wrong, dead wrong, I went to button things up and ground this green wire really well... car wouldn't start. why? because I was doing what the ECU was doing after a minute... this fuel pump relay is wried so that its always engaged and it exists only for the PCM to be able to turn the fuel pump off. apparently this controls the secondary full power mode for the pump but the pump is getting full battery voltage at idle so i suspect the PCM has been programmed to shut off the two stage fuel pump setup. TLDR: if your fuel pump shuts off after only a minute just jump this relay and you can bypass the PCM cutting off the pump. DO NOT DO THIS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! [ATTACH=full]1643765[/ATTACH] [/QUOTE]
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SN-95 and New Edge Mustangs
Dies after a minute or so, rough idle, but starts right back up
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