WhiteLightning00

I drive a 91 Mustang GT, EFI and after I got off of work last night I went to start the car and nothing. It did the same thing to me a few weeks ago, but this time I've had no luck in fixing it. At first I thought fuel pump because I couldn't hear it come on. Then when it did come on it would crank, but at idle it would drop down in rpms, then catch itself and shoot up, then drop down again and die. I tried to start it again this morning and the fuel pump would come on, but nothing besides what happens in the video. Also as of right now I have no way to check to see if it has spark or fuel pressure. Another thing is that it is my daily driver, so I start the car normally about 6 times a day. No problems until now. Any ideas on to what the problem might be? here is the video from this morning:

video

PRO50SC

Well, the first thing that needs to be determined is if it's a fuel problem or spark. You're gonna have to find a way to check it.

brentloftis

Fast and easy test would be to spray some ether (starting fluid)down the intake and crank it up. If it fires and runs for a little bit then it will be a fuel delivery issue.

OneFastEclipse

Just pull a plug out, leave it connected to the plug wire, have someone stand there and watch to see if it is sparking when you turn the car over.

94StinkinLincoln

pull the coil wire that goes to the dizzy, stick a plug in it,(use another spark plug wire if you have to) set it on some metal/grounded piece in the engine bay and crank it over, no spark= pip/ hall effect in dizzy not sending signal to TFI, TFI can be bad, and the coil its self. if you can get a noid light (checks injector pulse, and you get no pulse at cranking, 99% chance its the dizzy pip sensor, if it dies after it gets warm and wont start back up until its cooled off on a fox body (tfi mounted on dizzy) then the TFI is the cause.)

check fuel pressure, turn key on and hit the schrader valve on the fuel rail, if it keeps spitting fuel, then chances are its enought to get it started and idle. if the plugs get fouled, it makes it hard to start, hitting the gas pedal on and off helps, and if you hold the pedal down it shuts the injectors off during cranking so that u dont foul them.

cleanfitty

Does your tach move at all when it cranks?

WhiteLightning00

It's running now guys. I had my mom and sister bring me a vehicle as soon as they left it didn't crank the first time. I got out played with the coil and the Ignition Module Connector, and it started perfectly and idled fine for about 3 minutes. Cut it off and started it about 4 more times and every time perfect start. I hate I had my mom and sister had to drive 100 miles to get here and 100 miles to get back home to bring me a vehicle when mine started as soon as they left. I plan on replacing all of the ignition parts as I can afford them. Unfortunately I'm having to drive my mom's Expedition instead of my stang [&o]