Classic Mustangs (Tech) Technical discussions about the Mustangs of yester-year.

Hard Starting

Thread Tools
 
Search this Thread
 
Old May 30, 2015 | 04:25 PM
  #1  
sflip09's Avatar
sflip09
Thread Starter
 
Joined: May 2015
Posts: 5
From: Oregon
Default Hard Starting

When I first start my car in the morning there is typically no problem. In the subsequent starts is where the problem lies. The engine will just turn over and not start until I use a screwdriver and jump the I & S terminals on the starter solenoid. I replaced the ignition switch with no change. Is there an issue with electrical or the starter solenoid? Any help would be greatly appreciated. Thanks
Old May 30, 2015 | 04:41 PM
  #2  
sflip09's Avatar
sflip09
Thread Starter
 
Joined: May 2015
Posts: 5
From: Oregon
Default

I meant starter relay, not starter solenoid.
Old Jun 1, 2015 | 07:53 AM
  #3  
racer_dave's Avatar
racer_dave
3rd Gear Member
 
Joined: Aug 2009
Posts: 516
From: Michigan
Default

If jumping the solenoid terminals fixes the issue, then I'd replace the solenoid. Not uncommon for them to be affected by underhood heat as they get older. Make sure it's away from any heat sources.
Old Jun 3, 2015 | 10:13 AM
  #4  
Mach428's Avatar
Mach428
 
Joined: Jul 2013
Posts: 37
From: Florida
Default

You need to make sure you have 12V at the distributor positive terminal when the key is in the START position. This is supplied from the ignition switch to the solenoid. If not, check the small solenoid terminal (one farthest from the battery terminal of solenoid) when the key is turned to START. If not, replace solenoid.
Old Jun 3, 2015 | 10:36 AM
  #5  
Starfury's Avatar
Starfury
6th Gear Member
 
Joined: Aug 2007
Posts: 5,896
From: Elk Grove, CA
Default

+1 on the starter solenoid.

Be sure to get a quality replacement. BWD (or Napa's Echlin line, which come from the same Standard Motor Parts factory) are good quality. Stay away from everything else.

When you install the new one, be sure to clean any corrosion off the cable eyelets with a wire brush.
Old Jun 3, 2015 | 02:24 PM
  #6  
Derf00's Avatar
Derf00
Gentleman's Relish
 
Joined: Feb 2005
Posts: 13,189
From: AZ
Default

When you say 'The engine will just turn over' do you mean just one or two revolutions or that it cranks continuously but just won't catch/start?

I would think if either the starter relay or starter solenoid were bad, the engine would not crank...unless the relay controls spark or fuel...?

Last edited by Derf00; Jun 3, 2015 at 02:29 PM.
Old Jun 4, 2015 | 06:55 AM
  #7  
Mach428's Avatar
Mach428
 
Joined: Jul 2013
Posts: 37
From: Florida
Default

If by "hard starting" you mean the engine turns over but does not start (which I assume this is what you mean since it starts by jumping the solenoid) you need to check to ensure that you are getting 12V to the START terminal of the solenoid when the key is turned to start. The ignition switch provides 12V to the solenoid when the key is in the start position to provide 12V to the coil. If you have 12V to this terminal, the solenoid is bad. If you do not, the ingition switch is bad.

Hope this makes sense
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
StalkerGT
5.0L (1979-1995) Mustang
13
Sep 25, 2015 02:41 PM
Dragonus18
4.6L (1996-2004 Modular) Mustang
8
Sep 9, 2015 01:21 AM
5.0 kevo
5.0L (1979-1995) Mustang
6
Sep 3, 2015 06:24 PM
cbird1177711
2005-2014 Mustangs
0
Sep 2, 2015 04:12 PM




All times are GMT -5. The time now is 03:04 PM.