Starting Issue - MustangForums.com



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.
Sponsored by:
Sponsored by:

Reply
 
 
 
Thread Tools Search this Thread
Old 09-25-2015, 08:48 AM   #1
svfetter
1st Gear Member
Thread Starter
 
svfetter's Avatar
 
Join Date: Jun 2007
Location:
Posts: 142
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 ??
svfetter is offline   Reply With Quote
Old 09-25-2015, 09:02 AM   #2
88 orangepeel notch
6th Gear Member
 
88 orangepeel notch's Avatar
 
Join Date: Mar 2010
Location: Wisconsin
Posts: 5,062
Default

When was the last time she got a good / complete tune up ?
88 orangepeel notch is offline   Reply With Quote
Old 09-25-2015, 09:20 AM   #3
Urambo Tauro
3rd Gear Member
 
Urambo Tauro's Avatar
 
Join Date: Aug 2015
Location: SE Michigan
Posts: 552
Default

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...
Urambo Tauro is offline   Reply With Quote
Old 09-25-2015, 04:42 PM   #4
mjr46
D.R. THE PATHETIC DORK
 
mjr46's Avatar
 
Join Date: Jun 2007
Location: West Virginia
Posts: 30,786
Default

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
mjr46 is offline   Reply With Quote
Old 09-28-2015, 07:12 PM   #5
svfetter
1st Gear Member
Thread Starter
 
svfetter's Avatar
 
Join Date: Jun 2007
Location:
Posts: 142
Default

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!
svfetter is offline   Reply With Quote
Old 09-28-2015, 11:39 PM   #6
mjr46
D.R. THE PATHETIC DORK
 
mjr46's Avatar
 
Join Date: Jun 2007
Location: West Virginia
Posts: 30,786
Default

with a fuel pressure gauge test it
mjr46 is offline   Reply With Quote
Old 09-29-2015, 06:00 PM   #7
64bit
2nd Gear Member
 
64bit's Avatar
 
Join Date: Nov 2013
Location: RI
Posts: 250
Default

Quote:
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.
64bit is offline   Reply With Quote
Old 09-30-2015, 08:58 AM   #8
svfetter
1st Gear Member
Thread Starter
 
svfetter's Avatar
 
Join Date: Jun 2007
Location:
Posts: 142
Default

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.
svfetter is offline   Reply With Quote
Old 10-05-2015, 09:10 AM   #9
svfetter
1st Gear Member
Thread Starter
 
svfetter's Avatar
 
Join Date: Jun 2007
Location:
Posts: 142
Default

Installed a new Fuel Pressure Regulator and everything is back to normal. Thanks guys !!
svfetter is offline   Reply With Quote
Old 10-05-2015, 12:39 PM   #10
mjr46
D.R. THE PATHETIC DORK
 
mjr46's Avatar
 
Join Date: Jun 2007
Location: West Virginia
Posts: 30,786
Default

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.
mjr46 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Did a few mods this summer... drfister 2005-2014 Mustangs 9 09-04-2015 08:47 AM
5.0 wont start condition 5.0 kevo 5.0L (1979-1995) Mustang 6 09-03-2015 07:24 PM
crank no start 1st 4 eyed fox General Tech 2 08-24-2015 07:56 PM
P0148, VERY DESPERATE. Please help. mstahoo SVT Forums 9 08-16-2015 10:12 AM
Need Help Diagnosing Have Codes (Confused) djbigskrilla 2005-2014 Mustangs 13 08-11-2015 01:59 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Advertising
Featured Sponsors
Vendor Directory

All times are GMT -5. The time now is 04:02 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.