5.0 dies when you let off the key - Mustang Evolution

Go Back   Mustang Evolution > 1979-2015 Mustang GT || Tech and Talk > 1979-1995 Mustang GT



Reply
 
Thread Tools Search this Thread
Please support our sponsors and let them know you heard about them here!
Old 06-09-2015, 06:01 PM   #1
Registered User
Newbie
 
Join Date: Feb 2015
Posts: 6
5.0 dies when you let off the key

Hello everyone. I'm new to this and my mustang so I could use some help. I bought an 87 mustang gt that has an 85 carbed motor in it. Wasn't running when I got it. I put in the distributor, ignition module, and had to connect some things. Anyways... I had the car running about 2 weeks ago. Burnt up my fancy AutoZone starter. My uncle works there so he got me a new one. I installed the new starter with shims and now, for some strange reason, the car will start but as soon as you let off the key and it goes back to the run position, the car dies... Anyone have any input for me? I'm confused and keep chasing my tail on this one.. any help would be much appreciated. Thanks

Sent from my HTC6525LVW using Mustang Evolution mobile app
herman87 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 06-09-2015, 10:40 PM   #2
Registered Member
Regular
 
Foxbody91's Avatar
 
Join Date: Dec 2013
Location: Warner Robins
Region: Georgia
Posts: 285
In most cars when u switch to the key to start ur accessories r shut off( ur radio will turn off the on then off again) and only the ignition switch and fuel pump get power hfsdhjfdbfhyrfgygebdbzvwgwgeg


Sent from my iPhone using Mustang Evolution
Foxbody91 is offline   Reply With Quote
Old 06-09-2015, 10:42 PM   #3
Registered Member
Regular
 
Foxbody91's Avatar
 
Join Date: Dec 2013
Location: Warner Robins
Region: Georgia
Posts: 285
Uh ignore that last part lmao but long story short a suspect is the ignition switch


Sent from my iPhone using Mustang Evolution
Foxbody91 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 06-10-2015, 02:13 PM   #4
Registered User
Newbie
 
Join Date: Feb 2015
Posts: 6
That's what I was thinking after I posted. Lol I did some more research and that's what I ended up ordering. That's the only real answer I can think of. I'm starting with all the AutoZone stuff till I get it running then I'm gonna buy msd or something.
Thanks for the input

Sent from my HTC6525LVW using Mustang Evolution mobile app
herman87 is offline   Reply With Quote
Old 06-11-2015, 07:08 AM   #5
Registered Member
Regular
 
wbrockstar's Avatar
 
Join Date: Mar 2015
Location: Nashville
Region: Tennessee
Posts: 289
Yeah most likely a defective ignition switch.This link will help with the install.
BTW-dont buy any msd products.Guys are having a lot of issues with their products since they're being made by a different company and their quality of work has went down hill.Its better to use Crane or another companies ignition components vs msd.

http://www.mustangandfords.com/how-to/engine/5657/
__________________
91 LX 342ci(10.5:1)
TFS 190cc(stage ll)
TFS track heat
XE276HR .544" .544"
Flowtech 1 3/4"
Prochamber w FM
wbrockstar is offline   Reply With Quote
Old 06-11-2015, 07:10 AM   #6
Registered Member
Regular
 
Foxbody91's Avatar
 
Join Date: Dec 2013
Location: Warner Robins
Region: Georgia
Posts: 285
Quote:
Originally Posted by wbrockstar View Post
Yeah most likely a defective ignition switch.This link will help with the install.
BTW-dont buy any mad products.Guys are having a lot of issues with their products since they're being made by a different company and their quality of work has went down hill.Its better to use Crane or another companies ignition components vs mad.

Replace a 1979-1993 Ignition Switch Assembly



I agree


Sent from my iPhone using Mustang Evolution
Foxbody91 is offline   Reply With Quote
Old 06-11-2015, 12:39 PM   #7
Registered User
Newbie
 
Join Date: Jun 2015
Location: Florence
Region: Kentucky
Posts: 7
Cool

did you put a ignition box on it? make sure the hot wire it's on the correct side of the starter relay.
stang347 is offline   Reply With Quote
Old 06-12-2015, 06:04 AM   #8
RBK
Registered Member
Regular
 
Join Date: May 2015
Location: Chapel Hill
Region: North Carolina
Posts: 107
I remember reading about this problem many years ago. As it was explained in the article the start position uses a different circuit than the run position on the switch, or something like that. They said the ignition switch was the problem.
RBK is offline   Reply With Quote
Old 06-12-2015, 06:39 AM   #9
Registered Member
Regular
 
wbrockstar's Avatar
 
Join Date: Mar 2015
Location: Nashville
Region: Tennessee
Posts: 289
Here's the ignition switch diagram that shows what each pinout/wire goes to.
I would say the switch is probably bad in one of these circuits
16-ign coil/TFI/EEC relay circuit
37-battery power
I'm not sure about the circuits below.I didn't check to see what these fuses power,but their circuit might be bad if they feed anything ignition, fuel,ecm or battery related
687-powers fuse 5 & 8
297-powers fuse 2 6 11 & 14
Attached Thumbnails
Click image for larger version

Name:	IgnitionSwitchWiring.gif
Views:	4514
Size:	9.9 KB
ID:	184628  
__________________
91 LX 342ci(10.5:1)
TFS 190cc(stage ll)
TFS track heat
XE276HR .544" .544"
Flowtech 1 3/4"
Prochamber w FM
wbrockstar is offline   Reply With Quote
Old 06-15-2015, 08:53 PM   #10
Registered User
Newbie
 
Join Date: Feb 2015
Posts: 6
I replaced the ignition switch tonight and it still does the same thing. I'm lost. I will check the fuses tomorrow and whatever else I can do.

Sent from my HTC6525LVW using Mustang Evolution mobile app
herman87 is offline   Reply With Quote
Old 06-22-2015, 08:07 AM   #11
Registered Member
Regular
 
wbrockstar's Avatar
 
Join Date: Mar 2015
Location: Nashville
Region: Tennessee
Posts: 289
Did you get it running yet??
If not,turn the key on,use a voltmeter, probe the red wire of any of your injector harnesses and make sure you get 12 volts.Then probe the red wire on the coil harness to make sure it reads 12 volts also.
__________________
91 LX 342ci(10.5:1)
TFS 190cc(stage ll)
TFS track heat
XE276HR .544" .544"
Flowtech 1 3/4"
Prochamber w FM
wbrockstar is offline   Reply With Quote
Old 06-23-2015, 05:43 PM   #12
Registered User
Newbie
 
Join Date: Feb 2015
Posts: 6
It's converted to carburetor. I don't think I have those wires. I tested all the in line fuses and have tested the coil, ignition module, distributor and starter solenoid. I alarmed checked the ignition switch. I'm stuck now.

Sent from my HTC6525LVW using Mustang Evolution mobile app
herman87 is offline   Reply With Quote
Old 06-23-2015, 06:51 PM   #13
Registered User
Newbie
 
Join Date: Feb 2015
Posts: 6
Update.....
I was messing around with the car last week and lost spark by trying to jump the coil. My dumb *** did it wrong and messed up something. I jumped the coil in run on the positive side.... Long story short I lost spark now. Iv done everything I can think of. But I'm lost... Anyone done this mistake before?

Sent from my HTC6525LVW using Mustang Evolution mobile app
herman87 is offline   Reply With Quote
Old 07-09-2015, 04:29 PM   #14
Registered Member
Regular
 
wbrockstar's Avatar
 
Join Date: Mar 2015
Location: Nashville
Region: Tennessee
Posts: 289
Have you tested the fusible links that come off the starter solenoid??Since one leads to the ignition switch, another to the coil/TFI module,etc test them with a voltmeter to make sure none are blown.The picture below will help with their locations.
(Engine fires briefly but dies immediately when the key is released to the Run position)
Crank the engine & when it fires off, pull the small push on connector (red wire) off the starter relay (Looks like it is stuck on a screw). Hold the switch in the crank position: if it continues to run there is a problem with either the ignition switch or TFI module. Check for 12 volts at the red/green wire on the coil with the switch in the Run position. Good 12 volts, then replace the TFI. No 12 volts, replace the ignition switch or check for open in wiring/blown fusible link between switch & starter solenoid.You know the switch is good(most likely)since you just replaced it.
Attached Thumbnails
Click image for larger version

Name:	fuel-alt-links-ign-ac.gif
Views:	61
Size:	26.5 KB
ID:	186775  
__________________
91 LX 342ci(10.5:1)
TFS 190cc(stage ll)
TFS track heat
XE276HR .544" .544"
Flowtech 1 3/4"
Prochamber w FM
wbrockstar is offline   Reply With Quote
Reply

Lower Navigation
Go Back   Mustang Evolution > 1979-2015 Mustang GT || Tech and Talk > 1979-1995 Mustang GT

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Car still runs after key is turned off and removed....... ShortBusKustomz 1979-1995 Mustang GT 12 02-28-2016 07:28 PM
Unlock Key- Car Alarm goes off ctrez06 2005-2010 Mustang GT 8 11-30-2014 11:12 AM
Can you test key? Csnow99gt 1996-2004 Mustang GT 1 05-07-2012 08:33 AM
5.0 1990 mustang I hear a motor running after car is shut off and battery dies why? wylingford 1979-1995 Mustang GT 1 12-11-2011 11:50 PM
How do you get the trim off around ac/cd off?? ATTN: Zim too synister232 Mustang Audio & Video 4 07-16-2003 10:01 AM

» Like Us On Facebook



04:44 PM


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0

MustangEvolution.com is in no way associated with or endorsed by Ford Motor Company.