66 coupe with 86 5.0 not staring but runs

M

MidgetKicker

Member

Aug 4, 2018

19

2

13

Nowata County, OK

Apr 15, 2019

#1

• Apr 15, 2019

• #1

I sold a fox body and ended up buying this 66 coupe with an 86 5.0 that ran before it sat for 4 years. All fluids were drained before they left it parked. I cleaned gas tank changed fuel pump as it was dead. I changed fuel pressure regulator and fuel filter as well as all hoses with new clamps and blew out fuel lines. Car will crank but not start on its own. I spray just a small squirt of starting fluid and it fires up and runs with ease. I changed out tfi module as I was told could be it but it did not help. I can not find the plug that you are supposed to be able to use to get the codes off of computer.

I am looking for any and all suggestions and I have a page that has a list of stuff to try that I am gonna start on also.

 

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The Shemdogg

Active Member

Mar 15, 2016

137

23

38

san jose CA

Apr 15, 2019

#2

• Apr 15, 2019

• #2

get a fuel pressure gauge and see if you have pressure at the fuel rail. If you have pressure then your injectors are not firing, start checking for bad wires and retighten all your grounds.

shem

 

M

MidgetKicker

Member

Aug 4, 2018

19

2

13

Nowata County, OK

Apr 15, 2019

#3

• Apr 15, 2019

• #3

Pressure is at 40 before starting and runs around 32 when idling.

It runs on its own but needs starting fluid to start.

 

M

MidgetKicker

Member

Aug 4, 2018

19

2

13

Nowata County, OK

Apr 15, 2019

#4

• Apr 15, 2019

• #4

I bought a brand new battery for it as the one it had was shot. I will check on other items as I get chances....kids got ball practice and games staring all week.

 

M

MidgetKicker

Member

Aug 4, 2018

19

2

13

Nowata County, OK

Apr 15, 2019

#5

• Apr 15, 2019

• #5

Also has this when running....

How do u post a video?

 

Last edited: Apr 16, 2019

M

MidgetKicker

Member

Aug 4, 2018

19

2

13

Nowata County, OK

Apr 16, 2019

#6

• Apr 16, 2019

• #6

After running it for a bit I can shut it off and start it right back up. If let sit for about 30 seconds then it cranks and will not start again.

 

M

MidgetKicker

Member

Aug 4, 2018

19

2

13

Nowata County, OK

Apr 16, 2019

#7

• Apr 16, 2019

• #7

It has a new fuel pump, new filter, and new regulator. I blew out all lines and the rails. I replaced all rubber house parts with new. I cleaned tank and cleaned filter on pick up and blew out pick up tube as well. I have not tested the injectors yet.

I have bought new plugs, wires and coil today so I will see if that changes anything. After that it is back to chasing wires looking for weak grounds and breaks.

 

M

MidgetKicker

Member

Aug 4, 2018

19

2

13

Nowata County, OK

Apr 16, 2019

#8

• Apr 16, 2019

• #8

After changing plugs, wires and coil it will now start by itself.

My oil gauge slowly climbs to above high and temp gauge slowly creeps to high as well. I shut it off and go feel the radiator and hoses and nothing feels hot.

 

The Shemdogg

Active Member

Mar 15, 2016

137

23

38

san jose CA

Apr 17, 2019

#9

• Apr 17, 2019

• #9

Sounds like you have a jammed thermostat- radiator cold n engine hot. Pull the themo and run it again.

Does your car have the original engine harness? Find a wiring diagram for that year efi and find the color wires to find a signal wire for the check engine light and the aldl plug stuffed in there somewhere.

Gauges should work fine, I have the 95 motor with a 93 intake running a 90 computer and all my gauges work fine except the ammeter. I never hooked it up, I have a digital voltmeter on a gauge pod.

shem

 

M

MidgetKicker

Member

Aug 4, 2018

19

2

13

Nowata County, OK

May 23, 2019

#10

• May 23, 2019

• #10

Ok found lots of issues in the wiring harness when checking different voltages. I removed the harness and they have spots just taped together where they spliced and they have spots where they used 2 or 3 different size of wires to extend things and cut up a trailer wiring harness and used the wires from it in spots.

So since I have an 86 speed density 5.0 what harness should I get to replace this one or should I just make the necessary repairs? Will everything hook up the same if I got a 87 or 88 mustang wire harness and a da1 speed density computer? I just want it running again so wife can drive it while I plan out the mods I wanna make to it.

 

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