89 Mustang Started shutting off - Mustang Evolution

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Old 04-21-2015, 02:38 PM   #1
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89 Mustang Started shutting off

So last night I was coming from work and my car shut off on me twice both times I was stopped at a light but started right back up every time..
Any idea what it is
Car starts with no key also


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Old 04-25-2015, 07:38 AM   #2
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Bad ignition switch
Neutral safety switch
Fuel pump relay
EEC relay
Ignition module
Fuel pressure regulator
Coil
Dirty/bad connection on -10 pin connectors(aka:salt & pepper shakers)Follow the procedure in the 6th link below.
Bad fuel pump inertia switch.
Bad ground wire-(1st)battery neg to engine block (2nd)rear side of driver side cylinder head to firewall (3rd)EEC ground that's mounted to the fender apron and comes off of the neg battery cable(check the black round connecter that's inline with this ground wire too because it can become loose or dirty) (4th)ecm ground-located under the carpet/behind passenger side kick panel/this is the ground wire for the ecm(computer) The EEC relay I mentioned earlier is mounted above the ecm,if you didn't already know that info.As far as testing the fuel pressure regulator, let the car run,pull the vacuum hose off the intake fitting and regulator, do you see any fuel inside the hose or seeping out of the regulator vacuum port??If yes,the regulator is bad.The last link provides removal and installation instructions.


The links below will help with testing some of the listed components.
(1st)
NSS/Clutch Pedal Switch Code 67 Troubleshooting
(2nd)
Part 1 -Testing the Ford EEC Power Relay (Brown Relay)
(3rd)
Part 1 -How to Test the Ford Fuel Pump Relay (Green Relay)
(4th)
Part 1 -How to Test the Ford Ignition Control Module (Distributor Mounted)
(5th)
Part 1 -Ignition Coil Test -No Spark No Start Tests (Ford 4.9L, 5.0L, 5.8L)
(6th)
Fuel Injection Technical Library ยป 10-pin Connector Fix
(7th)
Replace a 1979-1993 Ignition Switch Assembly
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Old 04-25-2015, 12:46 PM   #3
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I failed to also list the pip sensor as a possible cause too.Its mounted inside the distributer, under the shaft and armature assembly. The pip sensor is the part that the ignition module plugs into on the bottom side of the distributer. You'll see the terminals on the pip sensor if you turn the distributer upside down.The link below will help with testing.
SBFTech.com TFI Module/Hall Sensor Testing Procedure
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91 LX 342ci(10.5:1)
TFS 190cc(stage ll)
TFS track heat
XE276HR .544" .544"
Flowtech 1 3/4"
Prochamber w FM
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Old 04-25-2015, 08:48 PM   #4
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Classic PIP failure which means you should replace the coil too. PIPs eat coils as they are on the way out. I replaced 3 coils in my Cobra thinking I was just getting **** coils before I said "**** it" and replaced the dizzy. Fine after that.
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