98 mustang cobra

66StangGuy · 12-02-2002, 12:05 AM

my friends 98 mustang cobra.. mostly stock except gears. anyway when he tries to start the car it wont start. were assuming its a fuel problem, if you turn the key off and then to the on posistion a few times 3 or 5 then try to start the car it will run for about 3 minutes then it starts to die out. sound like it has a miss but i think its lack of fuel pressure, eventually after stumbiling for 1 minute or so it stalls out and stops and wont start agian untill we mess with the key.

my other question would be could this be a computer issue.. i know that when the motor is running cold it runs rich and idels higher. i was wondring if the computer was going into lean condition and causing this problem. is there a way i can trick it into thinking the motors cold ans see if this helps.. other then pull the wire to the sensor cuz i figured that but i didnt get a chance to mess with anything much yet.

anyone have any ideas to help figure it out. also theres a new fuel pump..pickup and i checked codes...it reads that the o2 sensors are bad but could that be because of the lean condition from the computer? or is this a faulty fuel pump. thanks guys

sn95gt19 · 12-02-2002, 10:36 AM

to me it sounds like the fuel pump is priming when you turn the key off and on, but not on when the car is in the on position, either ignition switch, or fuel pump could be going! can you hear the pump prime when you turn the key off and on?

66StangGuy · 12-05-2002, 03:42 AM

i think i can hear the pump prime. anything else it can be other then the pump. i think its a new pump installed 6 months or sooner ago. not exactly shure. anything else i can try to be shure.

12-02-2002, 12:05 AM	#1
66StangGuy Registered Member Join Date: Feb 2002 Location: Diamond Bar Posts: 258	98 mustang cobra my friends 98 mustang cobra.. mostly stock except gears. anyway when he tries to start the car it wont start. were assuming its a fuel problem, if you turn the key off and then to the on posistion a few times 3 or 5 then try to start the car it will run for about 3 minutes then it starts to die out. sound like it has a miss but i think its lack of fuel pressure, eventually after stumbiling for 1 minute or so it stalls out and stops and wont start agian untill we mess with the key. my other question would be could this be a computer issue.. i know that when the motor is running cold it runs rich and idels higher. i was wondring if the computer was going into lean condition and causing this problem. is there a way i can trick it into thinking the motors cold ans see if this helps.. other then pull the wire to the sensor cuz i figured that but i didnt get a chance to mess with anything much yet. anyone have any ideas to help figure it out. also theres a new fuel pump..pickup and i checked codes...it reads that the o2 sensors are bad but could that be because of the lean condition from the computer? or is this a faulty fuel pump. thanks guys __________________ 66 mustang-292-Holley 4160-World Castings Windsor Sr.-Hooker super comp headers-MSD box & Coil.3.55 gears. B&M Z-Gate-Black leather racing seats with 4pt harnes.

12-02-2002, 10:36 AM	#2
sn95gt19 motors done......woohooo Join Date: Mar 2002 Posts: 799	to me it sounds like the fuel pump is priming when you turn the key off and on, but not on when the car is in the on position, either ignition switch, or fuel pump could be going! can you hear the pump prime when you turn the key off and on? __________________ 95gt lazer red (98 cobra clone) Rice Haters Club Member #116

12-05-2002, 03:42 AM	#3
66StangGuy Registered Member Join Date: Feb 2002 Location: Diamond Bar Posts: 258	i think i can hear the pump prime. anything else it can be other then the pump. i think its a new pump installed 6 months or sooner ago. not exactly shure. anything else i can try to be shure. __________________ 66 mustang-292-Holley 4160-World Castings Windsor Sr.-Hooker super comp headers-MSD box & Coil.3.55 gears. B&M Z-Gate-Black leather racing seats with 4pt harnes.

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