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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

Starting Issue

Old 09-25-2015, 07:48 AM
  #1  
svfetter
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Default Starting Issue

Orignal owner of 95 5.0. Approx 80K miles. Engine has always started very quickly. Now after 2 decades all of a sudden it freely cranks for several seconds before starting. Acts like its not getting enough fuel. Fuel pressure recently checked as OK. Just put on a fuel filter. Very intermittent.
Runs Great. Does not seem to be temperature related. Thought about air idle control valve, but they usually allow engine to start and then will die at idle from carbon build up.

Any Ideas ??
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Old 09-25-2015, 08:02 AM
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88 orangepeel notch
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When was the last time she got a good / complete tune up ?
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Old 09-25-2015, 08:20 AM
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Urambo Tauro
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Start with the battery by getting it load tested. It can sound like it's putting out plenty of cranking power, but still need a boost to start the car.

A tune-up may be in order, though...
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Old 09-25-2015, 03:42 PM
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mjr46
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if you mean it cranks longer than normal.........you need to check for fuel pressure leak down, not just adequate pressure but leakdown................koeo, should maintain pressure.......................pulse the key 3-4 times before cranking and see if symptoms go away....if they do, it's related to leakdown
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Old 09-28-2015, 06:12 PM
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Thanks guys. It's actually a new engine with new plugs, cap, rotor, and wires. Been starting great for 1000 miles before this started. Just put on new fuel filter and I am thinking leak down as well. How would I trouble shoot that?

Any other opinions welcome.

Thanks!
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Old 09-28-2015, 10:39 PM
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mjr46
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with a fuel pressure gauge test it
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Old 09-29-2015, 05:00 PM
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64bit
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Originally Posted by mjr46 View Post
if you mean it cranks longer than normal.........you need to check for fuel pressure leak down, not just adequate pressure but leakdown................koeo, should maintain pressure.......................pulse the key 3-4 times before cranking and see if symptoms go away....if they do, it's related to leakdown
I 100% agree with this. If your fuel system has a leakdown issue (usually related to a bad "S" hose in the tank, or a failing check valve in the pump) it will suffer from a long crank and possibly a lazy start when finally running.

As MJR has described, turn the key on and off a few times before cranking. If it starts better, start looking for a fuel pump kit.
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Old 09-30-2015, 07:58 AM
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Thanks again guys. In researching this I have found the same info everyone is telling me while learning about this condition. I have found if we turn the key to the run position and count to ten before cranking, she starts much better. In addition, I pulled off the vacuum hose on the pressure regulator and gasoline came out of the hose, so I certainly have a bad pressure regulator. As soon as I can get a new one I will provide an update.
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Old 10-05-2015, 08:10 AM
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Installed a new Fuel Pressure Regulator and everything is back to normal. Thanks guys !!
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Old 10-05-2015, 11:39 AM
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simple fuel pressure test would of lead to leakdown, then to checking such stuff.......you should invest in proper diag tools such as a fuel pressure gauge......can narrow down such issues quicker and eliminate guessing.........either way glad you found the issue.
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