Engine 1989 mustang gt wont start when reseting the key switch

[Sdbolen11]

I have a 1989 mustang gt 5.0. When the car is cold it fires right up. While still cold you can cut the engine off with the key n it will start back no problem. When it gets warm if you kill the key switch n try to start it all it will do is crank. Getting fuel pressure and spark just won't fire. But if you dump the clutch to kill the engine without turning off the key switch it will start right back up no problem. Im so confused can someone plz help. I have replaced the distributor, tfi module, etc and cleaned the mass air. It only does it if you reset the key switch while warm

 

[General karthief]

Check the switch down on the column under the dash. At least thats where I would start. There is a cranks but no start checklist that jrichker put together that will get you fixed.
https://www.stangnet.com/mustang-fo...start-checklist-fuel-injected-mustangs.787471

 

[Sdbolen11]

Ok thanks, I will try that tomorrow. It's crazy though because it won't die or anything. It runs great. But once u cut the key off n try to restart it, it just cranks. Has spark n fuel pressure. But if you kill the engine by dumping the clutch n restarting it without switching off the key it will start everytime...ahhhh I'm about to pull the rest of my hair out on this one

 

[Sdbolen11]

Couldn't find anything, but did figure out I can push the fuel at wot and it will fire up

 

[Steel1]

Couldn't find anything, but did figure out I can push the fuel at wot and it will fire up

Do you mean after you shut it down you hold the accelerator to the floor and it will crank right up ?
If so you are "clear starting" it by holding down the gas pedal you are cutting fuel to the injectors.
This would indicate possible injector/tune issues.

 

[Sdbolen11]

Yes after it gets to normal temp. I can shut it down by the key and hold the fuel at wot and it will fire right up. I've replaced the distributor, coil, etc, and cleaned the mass air.

 

[Steel1]

Does it have larger than stock injectors ?

 

[Sdbolen11]

I'm unsure, I just got the car a few weeks ago, the guy said he didn't know if it had anything done to it. When I got it I test drive it n the timing was so far out the valves was clattering, finally got that lined out. How would I be able to tell if they are larger?

 

[Steel1]

Stock for your car would be orange 19#
If they are stock could be leaking injector(s)
If they are larger they could also be leaking or you may need a correct ecu tune.
https://www.bing.com/images/search?...rs&selectedindex=11&ajaxhist=0&vt=0&eim=1,2,6

 

[Mustang5L5]

Sounds like you are flooding. Hold the accelerator to the floor and try cranking when it's hot.

Run your codes and see what pops up. Usually it's sign of a bad ECT

 

[Steel1]

Sounds like you are flooding. Hold the accelerator to the floor and try cranking when it's hot.

Run your codes and see what pops up. Usually it's sign of a bad ECT

Good point Mustang5L5 could also be ECT, just scratching the surface.

 

[General karthief]

Here's the checklist for cranks but no start issues: https://www.stangnet.com/mustang-fo...start-checklist-fuel-injected-mustangs.787471
Jrichker and others put this together and it works! Just start at the top and do the list one by one, shows how to check for codes too.