1989 Ford Mustang no fuel, no spark

Tiny
TANGMEISTER
  • MEMBER
  • 1989 FORD MUSTANG
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 145,000 MILES
This car ran when parked (sat 1 month), new plugs and an oil change performed. When started the plug wires were incorrect, blew out the muffler, never started. Bought a manual and a code checker, rectified the firing order, but have no fire or fue. Pulled the gas tank, the fuel pump runs. Chased the wire to under the drivers side seat, fuel pump relay, replaced it. Ingnition switch module, replaced. Ignition module on distributer, replaced. Still no fire or fuel, used the codechecker, no codes sent, refers back to manuel with no code error. Nothing in my manual about no code error. It's my understanding now it can be the MAP or throttle positioning sensor, or the computer could be bad. Is there anyway to check these, or advice on what to try next?
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Wednesday, March 24th, 2010 AT 2:56 PM

11 Replies

Tiny
RASMATAZ
  • MEMBER
Hi TangMeister, Welcome to 2carpros and TY for the donation

Ok -check for power at the coil positive terminal-do you have it?

Also test the ECC power relay or swap it with a like one. BTW when you turn key On do you hear the fuel pump come ON-Let me know
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Wednesday, March 24th, 2010 AT 3:26 PM
Tiny
TANGMEISTER
  • MEMBER
When the key is on I have power at both sides of the coil. The fuel pump will not run when the key is on. My wiring diagram shows the EEC relay sending a continuous hot wire to the fuel pump relay plug, this wire is hot at the relay. If I take a jumper wire from this hot wire and touch it to the fuel pump prong in the plug, the pump comes on and pressurizes the fuel rail to 42psi. So I'm guessing the wire from the computer isnt telling the relay to power the pump. I've been told it can be a sensor telling the computer to leave that wire "off". I just wonder if its the same sensor telling the ignition not to fire? Or maybe the computer just went bad.I'll be more than glad to make additional donations if we can figure this ole' heap out. My book shows this car does not have a cam or crank positioning sensor, but it does have these 5, engine coolant. Air charge temp. Throttle positioning. Egr valve or manifold absolute pressure (sensors). I do not know their exact roles in the computer though. Thanks for the help
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Thursday, March 25th, 2010 AT 9:45 AM
Tiny
RASMATAZ
  • MEMBER
In the ignition system check and test the coil, distributor pick-up coil and the ignition control module

If the fuel pump comes on by jumping orange and lite blue to the pink and black wires on the fuel pump relay socket either the tan and lite green wire is open or the computer
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Thursday, March 25th, 2010 AT 3:00 PM
Tiny
TANGMEISTER
  • MEMBER
I don't understand. The coil has power to it, the distributer has power to it. As I have said the ignition control module was tested and replaced, the pick up coil checks out ok. There are 4 wires that terminate in the plug for the fuel pump relay. One wire is orange, its always hot and comes from the ECC relay, One is red/black and comes from the inertia safety switch, this switch has tested ok. The pink one terminates at the fuel pump, and the tan/green heads to the computer. I can take only 2 of these wires, the orange, and run it to the pink, and the fuel pump runs. The computer isnt activating the fuel pump relay.I need to know what sensor/switch can prevent this signal from activating the fuel pump relay. I don't believe you finished your second sentence "either the tan and lite green wire is open or the computer" is bad? For the record I have bought 3 fuel pump relays always the same result.
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Thursday, March 25th, 2010 AT 4:34 PM
Tiny
RASMATAZ
  • MEMBER
There's is no switch/sensor controlling the fuel pump-the computer supplies the ground thru the tan and lite green wire

There are 4 wires that terminate in the plug for the fuel pump relay.

One wire is orange, its always hot and comes from the ECC relay, This wire comes from a fusible link the pink and black comes from the EEC relay. The other pink and black goes to the fuel pump and the tan and lite green wire is the grounding circuit-

Check if you have power going into the computer pin #1 black and orange-38
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Thursday, March 25th, 2010 AT 4:59 PM
Tiny
TANGMEISTER
  • MEMBER
I unplugged the computer to check pin 1 black/orange with the key off and it has no power. I tried with the key on. Still no power. I checked every pin in the plug with the key off and none of them are hot. I tried every one of them with the key on and had power to three pins, blue. Red. And green/yellow. I believe the red runs to the egr/fuel injection, I have no idea where the other two go.
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Friday, March 26th, 2010 AT 5:02 PM
Tiny
RASMATAZ
  • MEMBER
Pin no.1 is being powered by the fusible link W and also it powers the EEC power relay. Pin no.1 is the keep alive circuit to the computer.
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Friday, March 26th, 2010 AT 5:11 PM
Tiny
TANGMEISTER
  • MEMBER
Do you know where I can find the location of the ecc relay? I see it in the wiring diagram but don't even know what it looks like. I'm actually having trouble locating a new one, or even a pic of one. Thx
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Saturday, March 27th, 2010 AT 9:03 AM
Tiny
RASMATAZ
  • MEMBER
Lower RH Cowl Panel, Near ECA-sorry no pic
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Saturday, March 27th, 2010 AT 12:04 PM
Tiny
TANGMEISTER
  • MEMBER
The wires that comes from the starter selonoid to the ecc relay were burnt in two. It runs. I ended up chasing each wire anyway but thanks for trying.
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Sunday, March 28th, 2010 AT 11:27 AM
Tiny
RASMATAZ
  • MEMBER
Thanks for your negative feedback -The fusible link W at the starter relay powers the computer and EEC relay. You found the problem when I gave you the fusible link That's why you don't have both bcuz the computer is dead-and for check this and that I'm not there with the vehicle and also I'm not a magicman or God. I ended up chasing each wire anyway but thanks for trying. I've find this hard to believe.
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Sunday, March 28th, 2010 AT 5:08 PM

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