1989 Mustang Won't start! - Ford Mustang Forum

LinkBack Thread Tools
post #1 of 9 (permalink) Old 08-13-2006 Thread Starter
5.0L Member
mustang4155's Avatar
Joined: May 2006
Location: Chesapeake
Posts: 4
Exclamation 1989 Mustang Won't start!

I have a 1989 5.0L LX. I just completed a tear down and rebulid of the engine. I got to try to start it for the first time. It starts. I attempt to tweek in the timing by ear and check the operation. As I do this, the engine kills on an adjustment of the distributor. All is good except I forgot to tighten a exhaust header. I tighten it all up and all is still good. I also noticed I forgot to hook up a wire at the upper intake near the throttle body. I hooked it up..... I try to start the car again..... DEAD!!! I figure out that the coil isn't firing..... I replaced the coil.... No go. I check power to the coil. There is power. I test the resistance across the coil. It's within spec but barely. It's on the low end. Something is telling the coil not to fire. I replaced the ignition module (on the distributor).... No go..... I'm exhausted and deflated. Anyone know what the hell is going on here??? The book talks about an amplifier module. I think that is in the ignition module but, I'm not sure. It's only discussed in the first paragraph which explains the operation of the ignition system (which I'm not sure I truely understand). There's no procedure for replacement or anything for this amp module!!... Did they just misspeak in that paragragh, and really mean ignition module??? What do I do now? I fell like I'm just fishing now. I thought I'd just replace the whole distributor but, I don't know. I just keep throwing good money after bad!!!

When I say no go, I mean the engine attempts to start. It turns over and everything, just doesn't start.... No spark from the coil.....

mustang4155 is offline  
Sponsored Links
post #2 of 9 (permalink) Old 08-14-2006
5.0L Member
mustanghelper's Avatar
Joined: Aug 2006
Location: Central
Posts: 825
do you think the motor is way out of time still? disconnect the spout connector, and try to start it. check to see if all your plug wires are tight on the plugs.

mustanghelper is offline  
post #3 of 9 (permalink) Old 08-15-2006 Thread Starter
5.0L Member
mustang4155's Avatar
Joined: May 2006
Location: Chesapeake
Posts: 4
I'll do that but shoudn't there be a spark coming from the coil whether it's way out of time or not? Or even if the plugs are disconnected. That's how you check your plug wires by disconnecting them and using a screwdriver to test them. There's no spark coming from the coil. Those things are downstream of that...... What exactly is a spout connector????
mustang4155 is offline  
post #4 of 9 (permalink) Old 12-16-2006
5.0L Member
spike00svt's Avatar
Joined: Dec 2006
Location: Jackson
Posts: 1
same problem

If anyone could help me out I think I have the same problem on a 1986 GT 5.0. I was driving about 35mph and the motor cut out. I found that I also do not have spark coming from the coil. I replace the coil, timing module (on the distributor), and the PCM. I thought the PCM was shorted and this was the reason it wasn't sending a signal to the coil. I have constant power at the coil but the ground signal doesn't fluctuate from on to off while the engine is cranking. I was told that if the hall effects switch in the distributor is bad it won't tell the PCM when to fire the coil and the hall effect switch also operates the tachometer. So if this switch is bad the tach and the coil would not work. Any information would be a huge help.
spike00svt is offline  
post #5 of 9 (permalink) Old 12-26-2006
5.0L Member
ajreed69's Avatar
Joined: Nov 2006
Location: Upstate N.Y.
Posts: 95
Send a message via Yahoo to ajreed69
Thumbs up

pull a plug and leave plug wire attached. then jump the starter relay w/key on. this will easily determine if you have spark or not, because you have view of the actual plug'. if you have spark, check your fuel pressure. you probably hear the fuel pump kick on just by turning key to "on" position, and listen carefully towards the rear of car. if you have spark, and fuel pressure (stock fuel pump is 40 psi w/key, you do not even have to start the engine), then go back to timing. spark, and fuel pressure are quick easy checks. good luck.

'92 LX Coupe 5.0, Stock Ported Intake & Heads, C & L CAI, BBK 75 MM T/B, 24# Injectors, Lunatti Cam, Hedman Long Tube Headers, Flowmasters, Tremec 3550, Spec Stage 2 Clutch, Moser 31 Spline Axles & Spool, UPR Upper & Lower Control Arms, Lakewood Shocks, Auto Meter Gauges, MSD 6AL, Line Lock, Rollcage, Subframe Connectors, Nitrous,Weld Draglites, Drag Radials,4:56 Richmond Gears.
ajreed69 is offline  
post #6 of 9 (permalink) Old 12-29-2006
MACH I Member
Classic Member
5.0L Member
The Greek's Avatar
Joined: Nov 2006
Location: Jacksonville
Posts: 3,165
First thing never pull an ignition wire off of the coil or spark plug without allowing for a path to ground. If not grounded that high voltage will find the path of least resistance like back through the coil and into the ignition module,good by module. The Hall effect switch is what replaced the old ignition points set up. It is a small coil with an interruptor that passes through a small set of magnets. when cranking the engine there should be a pulsing signal to the coil from the distributor. These Hall switch assys. sometimes do go bad and are available for replacement. You must have a pulsing signal to the coil or it will not produce any high voltage to the spark plug side. Wanted to throw that info out there to you. Lots of luck to you all.---- Chuck- The Hall switch is located in the distributor. The definition for SPOUT is Spark Output Signal from the EEC-IV processor.
The Greek is offline  
post #7 of 9 (permalink) Old 01-03-2007
5.0L Member
pimpenstang's Avatar
Joined: Jan 2007
Location: Austin
Posts: 12
it is very common for that part to go out in the distributor...start there its alot cheaper
pimpenstang is offline  
post #8 of 9 (permalink) Old 10-14-2007
2.3L Member
michael1945's Avatar
Joined: Oct 2007
Location: Rock Hill
Posts: 1
Where Is The Computer Module Located On A 1989 Lx 2.3
michael1945 is offline  
post #9 of 9 (permalink) Old 10-31-2007
5.0L Member
davashcow's Avatar
Joined: Oct 2007
Location: Durham
Posts: 44
Originally Posted by michael1945 View Post
Where Is The Computer Module Located On A 1989 Lx 2.3
Should be sitting right where a 5.0 module is located...behind the passenger kick panel. If you sit in the pass. seat and move your foot to the right, you will kick the panel that covers the module. (on a 5.0)
davashcow is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Ford Mustang Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a VALID email address for yourself, otherwise you will not receive the necessary confirmation email needed to confirm, validate and activate your new AFM member account.

Failure to provide a VALID email address, will result in the cancellation of your new AFM member account registration.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

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 Off
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are On

For the best viewing experience please update your browser to Google Chrome