START IDLE, RUNS THEN DIES

slownomo · October 4th, 2007, 05:42 PM

Hey guys/gals..

i have a problem that is *(&(%) me up the car is a a 1986 mustang 50 fi [speed density]

here's what happens, hard start-if left to idle for about a min it dies boom! shuts right down and if you try to give it ANY throttle it's like you hit a kill switch ,....but sometimes if you just floor the car it will run at about 3000 rpm but lumpy sounding as if a cam were in it [but it's stock] if you release the throttle it smooths out for a second and will go to 3500 rpm [sort of acts like a backwards gas peddle revs from floored to idle as opposed the the normal way....but then it dies after a few seconds while idling, will run forever but crappy as described but ONLY IF IT'S FLOORED!

codes I have are low voltage to fue pump relay...maf sensor [replaced it] map sensor [replaced it but still have the code after clearing it] tp sensor out of adjustment code [but got that code when I adjusted it]

my guess at this point is a fuel pump but wanted opinions on this

any ideas/?

G.T. Rags · October 4th, 2007, 08:11 PM

u'd prolly get a bigger response in the 5.0 section

homebrewed · October 4th, 2007, 11:45 PM

how bout the injectors themselves? mine did something similiar to that and it was the injectors.

tho. thats just one option...

ujslost · October 5th, 2007, 01:17 AM

Im confused, you stated Speed density and then said you replaced the MAF???

Anyhow if it is speed density replace the black box that has a vac hose and a wire connector hooked to it. I for get what its called but I wanta say the Bap sensor. Which is sorta a MAF sensor on the speed density cars.

slownomo · October 5th, 2007, 02:05 AM

I know I was only able to see a pic of one speed density car and there was no maf meter/sensor but there is on this one [california?] or canadian? .

I'll clean and test the injectors for some reason I never thought of those as the problem but it makes sense.

slownomo · October 6th, 2007, 07:04 AM

MORE INFO: the car is from CA and it did come stock w/ a maf! freaky huh? and i am thinking more and more like it might be a bad pcm gotta do more testing but christ every sensor and even the dist. was replaced [before i got it]

QUESTION can i swap in a 9al ? it has a maf but is it still a speed density set up? or not?

homebrewed · October 6th, 2007, 12:20 PM

I should think so. My car was an '88 4cyl and its got a '91 drivetrain and the PCM/harness out of a GT

October 4th, 2007, 05:42 PM	#1
slownomo Newbie Join Date: Sep 2007 Posts: 34 iTrader: 0 reviews	START IDLE, RUNS THEN DIES Hey guys/gals.. i have a problem that is *(&(%) me up the car is a a 1986 mustang 50 fi [speed density] here's what happens, hard start-if left to idle for about a min it dies boom! shuts right down and if you try to give it ANY throttle it's like you hit a kill switch ,....but sometimes if you just floor the car it will run at about 3000 rpm but lumpy sounding as if a cam were in it [but it's stock] if you release the throttle it smooths out for a second and will go to 3500 rpm [sort of acts like a backwards gas peddle revs from floored to idle as opposed the the normal way....but then it dies after a few seconds while idling, will run forever but crappy as described but ONLY IF IT'S FLOORED! codes I have are low voltage to fue pump relay...maf sensor [replaced it] map sensor [replaced it but still have the code after clearing it] tp sensor out of adjustment code [but got that code when I adjusted it] my guess at this point is a fuel pump but wanted opinions on this any ideas/?

October 5th, 2007, 01:17 AM	#4
ujslost MM Fanatic Join Date: Mar 2007 Location: Albertville, AL Posts: 3,920 Blog Entries: 1 iTrader: 1 reviews	Im confused, you stated Speed density and then said you replaced the MAF??? Anyhow if it is speed density replace the black box that has a vac hose and a wire connector hooked to it. I for get what its called but I wanta say the Bap sensor. Which is sorta a MAF sensor on the speed density cars. __________________ 1986 Mustang GT t-top time piece!

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October 5th, 2007, 02:05 AM	#5
slownomo Newbie Join Date: Sep 2007 Posts: 34 iTrader: 0 reviews	I know I was only able to see a pic of one speed density car and there was no maf meter/sensor but there is on this one [california?] or canadian? . I'll clean and test the injectors for some reason I never thought of those as the problem but it makes sense.

October 6th, 2007, 07:04 AM	#6
slownomo Newbie Join Date: Sep 2007 Posts: 34 iTrader: 0 reviews	MORE INFO: the car is from CA and it did come stock w/ a maf! freaky huh? and i am thinking more and more like it might be a bad pcm gotta do more testing but christ every sensor and even the dist. was replaced [before i got it] QUESTION can i swap in a 9al ? it has a maf but is it still a speed density set up? or not?

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