87 gt cranks got spark got fuel stays started when i hold key turned help asap

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davidohio

New Member

May 12, 2009

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Jul 12, 2009

#1

• Jul 12, 2009

• #1

i got an 87 all stock 5.0 i got spark and fuel pres car ran fine for over 1 month then i ran into this problem again it had a aftermarket alarm in it i ripped it all out then the car would stay started only if i holded the key to the on pos but the starter would grind i started screwing around under the coluem area with a fwe wires and then it started normal so a month later i changed the battrey other day got on the high pow dead same problem soon had i chnaged the battrey before that car ran awsome i figured the coluem wires was screwed up again so i went today brouth a whole colum installed it and turns out it anit that now iam lost again i got spark and fuel so its not that the car ran great fwe days ago

 

5

5.0ina66

Member

Jun 6, 2003

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16

Ohio

Jul 12, 2009

#2

• Jul 12, 2009

• #2

Hmm...almost seems like the fuel pump isn't getting switched on. I'm not 100% sure if a 5.0 is setup like this, but most cars will run the pump when you twist the key to "crank" and then they look for signal from the distributor before they go ahead and tell the pump to keep running.

If that is how it works, it could be the wiring, the TFI module, distributor itself, or maybe the ECM. Or it could be something else.

Maybe a bad crash shutoff switch?

 

tmoss

Gettin Wired

Founding Member

Jun 28, 2001

7,153

32

128

Saint Louis, MO

Jul 13, 2009

#3

• Jul 13, 2009

• #3

grammar - learn how to use it and spell check.............. you might get more help.

 

kendoo130

Founding Member

May 30, 2002

244

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Huntington Station N.Y.

Jul 13, 2009

#4

• Jul 13, 2009

• #4

It's probably your ignition switch.

 

TenorPlayinGuy

Founding Member

Aug 3, 2001

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36

Canyon Country, Ca

Jul 13, 2009

#5

• Jul 13, 2009

• #5

kendoo130 said:

It's probably your ignition switch.

Click to expand...

+1

 

clement

Founding Member

Feb 27, 2001

1,106

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59

Oak Cliff

Jul 13, 2009

#6

• Jul 13, 2009

• #6

if you mean it only runs when cranking, but wont stay running after you let off the starter....

you might check the main pcm ground to make sure it didnt come loose. check it over by the coil where its shrouded in a plastic casing. it can come loose there and not look it, and it will give the same symptom you are describing.

 

J

James_G

New Member

Apr 9, 2009

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0

Jul 14, 2009

#7

• Jul 14, 2009

• #7

ignition switch i had to replace mine for the same reason. Real easy to change jus tmake sure you get a t27 tamper proof torx bit before you take it apart.

 

JB_90LX50

New Member

Jun 30, 2009

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Jul 15, 2009

#8

• Jul 15, 2009

• #8

kendoo130 said:

It's probably your ignition switch.

Click to expand...

I have to agree, I havent had that problem in my mustang yet, but had the exact same problem with my 1985 F-150.