Need help please!

89_notch

New Member
May 12, 2018
3
0
1
37
Minnesota
I've got an 89 notch and having some issues. 2 days ago I installed a megasquirt pnp computer. Was able to get it to connect to my laptop and everything was working great. Now I installed a new coil and spark plugs. I got in and the computer will no longer connect with the laptop. Even worse, I can hear the fuel pump run and shut off as it should but it will not crank with the key. Please help! It will crank if i jump the solenoid, but get nothing with the key. Thanks in advance!
 
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General karthief

wonder how much it would cost to ship you a pair
Mod Dude
Aug 25, 2016
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Check your ignition switch under the dash on the lower part of the steering column for power. They are notorious for malfunctioning.
 

jrichker

StangNet's favorite TOOL
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lowendmac.com
No Crank checklist for 5.0 Mustangs

Revised 24-Oct-2013 to update voltage drop figures.

No crank, slow crank and stuck starter solenoid problems have the same root causes – low battery voltage and poor connections. For that reason, they are grouped together.
Use the same initial group of tests to find the root cause of slow crank, no crank and stuck solenoid problems.

Since some of the tests will bypass the safety interlocks, make sure that the car is in neutral and the parking brake is set. Becoming a pancake isn’t part of the repair process…


1.) Will the car start if it is jumped? Then clean battery terminals and check battery for low charge and dead cells. A good battery will measure 12-13 volts at full charge with the ignition switch in the Run position but without the engine running.
A voltmeter placed across the battery terminals should show a minimum of 9.5-10 volts when the ignition switch is turned to the Start position and the starter engages or tries to engage. Less than this will result in a clicking solenoid, or slow cranking (if it cranks at all) or a starter solenoid that sticks and welds the contacts together.

Most auto parts stores will check your battery for free. It does not have to be installed in the car to have it checked; you can carry it with you to the auto parts store.

The battery posts and inside of the battery post terminals should be scraped clean with a knife or battery post cleaner tool. This little trick will fix a surprising number of no start problems.

The clamp on with 2 bolts battery terminal ends are a known problem causer. Any place you see green on a copper wire is corrosion. Corrosion gets in the clamped joint and works its way up the wire under the insulation. Corroded connections do not conduct electricity well. Avoid them like the plague...

If the starter solenoid welds the contacts, then the starter will attempt to run anytime there is power in the battery. The cables and solenoid will get very hot, and may even start smoking. The temporary fix for a welded starter solenoid is to disconnect the battery and smack the back of the solenoid housing a sharp blow with a hammer. This may cause the contacts to unstick and work normally for a while.

A voltmeter is handy if you are familiar with how to use it to find bad connections. Measure the voltage drop across a connection while trying to start the car: more than .25 volts across a connection indicates a problem. The voltage drop tests need to be done while cranking the engine. It's the current flowing through a connection or wire that causes the voltage drop.

See http://assets.fluke.com/appnotes/automotive/beatbook.pdf for help for help troubleshooting voltage drops across connections and components. .



Voltage drops should not exceed the following:
200 mV Wire or cable
300 mV Switch or solenoid
100 mV Ground
0.0V Connections
A voltage drop lower that spec is always acceptable.

2.) Check the battery to engine block ground down near the oil filter, and the ground behind the engine to the firewall. All grounds should be clean and shiny. Use some sandpaper to clean them up.

3.) Jump the big terminals on the starter solenoid next to the battery with a screwdriver - watch out for the sparks! If the engine cranks, the starter and power wiring is good. The starter relay is also known as a starter solenoid.

The rest of the tech note only concerns no crank problems. If your problem was a stuck solenoid, go back to step 1.

4.) Then pull the small push on connector (small red/blue wire) off the starter solenoid (Looks like it is stuck on a screw). Then jump between the screw and the terminal that is connected to the battery. If it cranks, the relay is good and your problem is in the rest of the circuit.

5.) Remember to check the ignition switch, neutral safety switch on auto trans and the clutch safety switch on manual trans cars. If they are good, then you have wiring problems.

Typical start circuit...
Diagram courtesy of Tmoss & Stang&2birds



6.) Pull the starter and take it to AutoZone or Pep Boys and have them test it. Starter fails test, then replace it. If you got this far, the starter is probably bad.


Starter solenoid wiring for 86-91 Mustang




Starter solenoid wiring 92-93 Mustang or earlier Mustang with upgraded high torque mini starter.



Electrical checks for the switches and starter solenoid
Remove the small red/blue wire from the starter solenoid. Use a screwdriver to bridge the connection from the battery positive connection on the starter solenoid to the small screw where the red/blue wire was connected. The starter should crank the engine. If it does not, the starter solenoid is defective or the battery lacks sufficient charge to crank the engine.

If the starter does crank the engine, the problem is in the clutch safety circuit (5 speed) or Neutral Sense Switch (auto trans) or ignition switch.

See the Typical start circuit diagram above for wiring information for troubleshooting.

You will need a voltmeter or test lamp for the rest of the checks. Connect one lead of the voltmeter or test lamp to ground. The other lead will connect to the item under test.
Look for 12 volts on the white/pink wire when the ignition switch is turned to the Start position. Check the ignition switch first.
No 12 volts, replace the ignition switch.

The next step will require you to push the clutch pedal to the floor (5 speed) or put the transmission in neutral (auto trans) while the ignition switch is turned to the Start position.
Good 12 volts, check the clutch safety switch (5 speed) or Neutral Sense Switch (auto trans) for good 12 volts on both sides of the switches. No 12 volts on both sides of the switch and the switches are defective or out of adjustment. Check the wiring for bad connections while you are at it.
 

89_notch

New Member
May 12, 2018
3
0
1
37
Minnesota
Wow! Thank you for the reply! A little more background on the car. I bought it in high school, drove it for a few years. Then I was shipped overseas right after 9/11 and parked it in a barn. Ended up with a wife and kids so with the other responsibilities I never got it back out. Well, here we are 17 years later and i finally have the means to fix it up. It's been a complete rebuild. 347 striker bottom end with a Trick Flow top end. BBK 75mm throttle body, 255lph fuel pump, 36# injectors. Amongst other things. Initially tried to start the car with factory computer and it would just flood out the car. Got the megasquirt computer a few days ago and the car cranked good. It also connected with the laptop as it should. Now I changed the coil and plugs and I get nothing. The computer wont connect with the laptop. The fuel pump primes the system as it should but nothing happens when I turn the key. Almost like the computer isn't getting power. Hooked up the old computer again and same thing. Wont crank. Going to buy an ignition switch this morning and see if that helps.
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General karthief

wonder how much it would cost to ship you a pair
Mod Dude
Aug 25, 2016
17,388
5,595
193
polk county florida
Did you check to see if it had power coming in?
don't take this the wrong way but the idea here is to diagnose and repair the no start condition, go through the checklist posted above and I can almost guarantee to find the problem, if you get stuck or have any questions we are a few key clicks away.