Ford Mustang Forum banner

Hard Cold Start

1186 Views 10 Replies 3 Participants Last post by  joes2241
Hi all,

I posted about this issue before and i thought I thought I had it resolved when I replaced my fuel pressure regulator but it is still there.

So what is happening is I have to prime the fuel pump a few times after the car sits for about 10 mins, if I shut the car off and restart within around 5 minutes it will fire right up.

I know it's not the fuel pressure regulator, my next guess is it's a leaky fuel injector. I had the upper intake off today and I had the 4 bolts off that hold the fuel rail on along will all the electrical connectors to the injectors but i could not lift the fuel rail up, am i missing something? I did not want to pull on the fuel rail too hard and break an injector.

second once I get the fuel rail up, is there an easy way to tell if an injector is leaking?

Third if it's not a leaking injector does anyone have any other suggestions?

thank you
1 - 2 of 11 Posts
Your o-rings are worn and compressed and you should change them out while you have the injectors out. They don't cost much and are easy to change. Did you notice any fuel or staining on the intake below the loose injector? If so then you were losing pressure there. If not then the problem is either the pump or regulator, more than likely. If an injector pintle is stuck open and bleeding down into a cylinder, you should see some black (fuel) smoke on start up. Hope this helps.
What year is your car? If it has a distributor then the ignition control module or coil could be getting hot and not wanting to restart. Put her back together and pull the codes on it.
Good luck.
1 - 2 of 11 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.