Sick pony, ran codes, need advice

[281pony]

today i got on my car some, and it has noticably less power (revving/spinning tire loss). it seems to be revving slow like it used to with my old motor, and i cannot begin to guess what the hell is wrong now. so ill give some information and see what you guys think here.

timing: 10, fp 38, new everything, runs good otherwise besides getting on it.

codes:

code 95: Fuel pump secondary circuit fault.

no idea what this is. i have asked before and nothing stands out in my mind i got for a suggestion. today i called a performance shop who does mustang dyno-tunes and got an idea.

when i did my mass air conversion he asked if i hooked up the fuel pump ground wire from under the seat. there is a wire running into the speed density harness from under the seat. i used the FMS conversion which retains the stock harness, and has a seperate jumper wire. it made no mention of this, and i already have the ground wire running into the harness, so i am mostly disreguarding that.

otherwards, anyone have a suggestion other then taking it in for a dynotune? i dont really have the money for it. i was quoted 400+ for a tune, and 700+ for a tune with a chip. im hoping i can get some type of diagnostic tests done for less then that.

it is just a street car that i rarely get on, maybe once or twice a month. i dont like the fact its not running right though whenever i start it. thanks for any input. i have a feeling i might be taking it in for a tune reguardless

 

[MarSaleenMustan]

today i got on my car some, and it has noticably less power (revving/spinning tire loss). it seems to be revving slow like it used to with my old motor, and i cannot begin to guess what the hell is wrong now. so ill give some information and see what you guys think here.

timing: 10, fp 38, new everything, runs good otherwise besides getting on it.

codes:

code 95: Fuel pump secondary circuit fault.

no idea what this is. i have asked before and nothing stands out in my mind i got for a suggestion. today i called a performance shop who does mustang dyno-tunes and got an idea.

when i did my mass air conversion he asked if i hooked up the fuel pump ground wire from under the seat. there is a wire running into the speed density harness from under the seat. i used the FMS conversion which retains the stock harness, and has a seperate jumper wire. it made no mention of this, and i already have the ground wire running into the harness, so i am mostly disreguarding that.

otherwards, anyone have a suggestion other then taking it in for a dynotune? i dont really have the money for it. i was quoted 400+ for a tune, and 700+ for a tune with a chip. im hoping i can get some type of diagnostic tests done for less then that.

it is just a street car that i rarely get on, maybe once or twice a month. i dont like the fact its not running right though whenever i start it. thanks for any input. i have a feeling i might be taking it in for a tune reguardless

for sure it sounds like fuel issue, start with little things... have you changed your fuel filter?

 

[281pony]

fuel filter changed a few k miles ago. thats funny you mention it though, it brings back something else fuel related.

i had a 190 lph walbro in there before. the car used to get really jittery and run like crap, but i would replace a fuel filter and it went away. one day i decided it had to be the pump. sure enough no filter on it, and it was full of dirt.

so the filter and pump were replaced, and nothing like it since. so that is another thing that "happened". nothing like it now though.

i use stock fuel rails, 24# bosch injectors, and a 190 lph fuel pump. not sure what else it can be fuel related except that code.

every once in awhile, i feel a slight cutout/miss, whatever you want to call it at 1500 rpm's. it is very faint and only ocassional. so maybe this can finally get somewhere. it seems like the car has always run off and on good.

 

[MarSaleenMustan]

hows the mass airflow sensor? i'm assuming you got a recalibrated one for the bigger injectors. a bad maf could cause sputtering.

 

[kystang1889]

sounds like you have an open in fuel pump circuit make sure you have a good power and ground and test the fuel pump

 

[jrichker]

Code 95 - Possible bad fuel pump ground or open between fuel pump and pin 8 at PCM (Fuel Pump Monitor signal) - Power / Fuel Pump Circuits

A voltmeter is handy if you are familiar with how to use it to find bad connections. Measure the voltage drop across a connection: more than .5 volts across a connection indicates a problem.
See http://www.fluke.com/application_notes/automotive/circuit.asp?AGID=1&SID=103#volt for a diagram on how to do voltage drop testing

For 87-90 model cars, to help troubleshoot the 95 code, follow this link for a wiring diagram http://www.veryuseful.com/mustang/tech/engine/images/fuel-alt-links-ign-ac.gif

For 91-93 model cars, help troubleshoot the 95 code, follow this link for a wiring diagram http://www.autozone.com/images/cds/gif/large/0900823d80195963.gif

Also see http://www.autozone.com/servlet/UiB..._us/0900823d/80/19/59/5a/0900823d8019595a.jsp

Check the black wire that comes out of the tank; it is the fuel pump ground. It goes to a 2 wire connector and then ground to the chassis. If the connections get dirty or corroded, you will lose fuel pressure.

 

[281pony]

thanks for the links jricher. ill have to look at it this weekend more.