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Electrical Starts As I Let Go Of Key?

  • Thread starter Thread starter 1MEAN91
  • Start date Start date Aug 13, 2012

1MEAN91

New Member
Jun 22, 2012
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Aug 13, 2012
#1
  • Aug 13, 2012
  • #1
well Ive been searching for most of the gremlins that are in this car. So far most of them have been fixed. One last odd problem is that the car will crank forever until I let go of the key and give partial throttle. Ive gone through most of the tech articles and when ive jumped my starter solenoid with a screwdriver, it starts normally, without long crank. Ive replaced Ignition switch, and ive tested my TFI ( blinks when tested with a test light @ coil ) But no real answer is given? Any ideas?
 

rd

Founding Member
Jan 12, 2000
3,316
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109
Ocean Springs MS
Aug 14, 2012
#2
  • Aug 14, 2012
  • #2
This answer is for an older ignition with a separate coil, but try it. It sounds like you have power to the coil or ignition in the run position of the key/ignition switch, but not in the start position. Because the fuel pump is working and the engine is turning over, it will catch and run when the key goes back to run. Check the start power circuit to the ignition.
 

jrichker

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Mar 10, 2000
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Dublin GA
Aug 14, 2012
#3
  • Aug 14, 2012
  • #3
The TFI module has a red/blue wire on it that is connected to the starter circuit. The purpose of this wire is to tell the TFI to provide a hotter spark when cranking.

Use a safety pin to connect to the red/blue wire on the TFI and connect your voltmeter to it . Connect the other voltmeter lead to ground. Try to start the car in normal fashion. You should see 12 volts on the red/blue wire. No 12 volts, look for the small red/blue wire on the starter solenoid. Check for good 12 volts there, if it is good, there is a wiring problem between the starter red/blue wire and the red/blue wire on the TFI.

Diagram courtesy of Tmoss & Stang&2birds




Starter solenoid wiring for 86-91 Mustang





Where to find free Mustang wiring diagrams.

See the following website for some help from Tmoss (diagram designer) & Stang&2Birds (website host) for help on 88-95 wiring http://www.veryuseful.com/mustang/tech/engine/ Everyone should bookmark this site.

Ignition switch wiring
http://www.veryuseful.com/mustang/tech/engine/images/IgnitionSwitchWiring.gif

Fuel, alternator, A/C and ignition wiring
http://www.veryuseful.com/mustang/tech/engine/images/fuel-alt-links-ign-ac.gif

Complete computer, actuator & sensor wiring diagram for 88-91 Mass Air Mustangs
http://www.veryuseful.com/mustang/tech/engine/images/88-91_5.0_EEC_Wiring_Diagram.gif

Complete computer, actuator & sensor wiring diagram for 91-93 Mass Air Mustangs
http://www.veryuseful.com/mustang/tech/engine/images/91-93_5.0_EEC_Wiring_Diagram.gif

Vacuum diagram 89-93 Mustangs
http://www.veryuseful.com/mustang/tech/engine/images/mustangFoxFordVacuumDiagram.jpg

HVAC vacuum diagram
http://www.veryuseful.com/mustang/tech/engine/images/Mustang_AC_heat_vacuum_controls.gif

TFI module differences & pin out
http://www.veryuseful.com/mustang/tech/engine/images/TFI_5.0_comparison.gif

Fuse box layout
http://www.veryuseful.com/mustang/tech/engine/images/MustangFuseBox.gif

87-92 power window wiring
http://www.veryuseful.com/mustang/tech/engine/images/mustang87-92 PowerWindowWiring.gif

93 power window wiring
http://www.veryuseful.com/mustang/tech/engine/images/mustang93PowerWindows.gif[/b]
 
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